Ef80 tube amplifier.

Ef80 tube amplifier I decided to use 300 plate volts which is the max plate voltage for the EF80 since most great tube amps run at or exceed the limit. S. Jan 9, 2022 · Re: EF80 based power amp for guitar Post by martin manning » Sun Jan 09, 2022 7:27 pm Yoda wrote: ↑ Sun Jan 09, 2022 7:20 pm I’ve built several amps with Rob Robinette’s EF80 power section Oct 16, 2021 · This amp uses an EL84 (6BQ5). EMM801---Rare preamp to be operated with LS8 or LS15 power amp. Mullard EF80 Valve Valve manufacture in the UK was a large industrial operation in the 1950s with millions of valves being produced each year. 5 days ago · Archiver | 手机版 | ( 鄂ICP备05007555号 ICP证:鄂B2-20130019 公安局网监备：420100007348 邮箱：1343292467@qq. The 269EX/369EX is a good choice for any amp using an EF80 power amp but it does not include a 5v secondary so use an EZ81 (6. Rob Robinette's web effects (KTxx: “Kinkless Tube”) further enhancing efficiency. Jul 31, 2022 #19 Apr 10, 2023 · Together with low value filter capacitor that can make sound interesting. Jan 7, 2021 · The EL41 tube datasheet says Vgs2 = Va = 250V for a SE class A amplifier - so maybe it's correct.  Classic Tweed Bassman (early Marshall) tones from whisper to reasonable volumes with the post phase May 7, 2014 · since my last subminiature build someone talked about some spud amplifiers. images/Guitar/Tubes/Plates. The Fender 5F1 Champ is a Class A cathode biased amp. Die EF80 ist eigentlich eine RF/HF Röhre, eignet sich bei entsprechender Anpassung aber sehr gut für eine NF Stufe, außerdem bringt sie eine höhere Treiberleistung für die Endröhre, ein hörbarer Unterschied beim Rauschen in Vergleich zur EF86 war bei der Verwendung in Endstufen nicht festzustellen. Upgrade circuit can ensure lower background noise, more powerful bass and more brilliant treble. It's designed mainly for synth users but can be used with any instrument or signal. Ef80 tube amplifier Post by drywhitetoast » 27 Sep Post by Legrace » 28 Sep Post by drywhitetoast » 28 Sep Post by mo-tech » 30 Sep Post by shadowfax » 03 Oct Post by drywhitetoast » 04 Oct Post by mo-tech » 06 Oct Post by drywhitetoast » 07 Oct Post by kenny » 10 Oct Post by drywhitetoast » 10 Oct Post by Legrace » 10 Oct Quick links. Apr 18, 2017 · This Tube amplifier itself is divided into several portions. E. I wound up with a little subminiature tube for the gain stage, which was later replaced with a 6AK5 7 pin pentode. I came up with an all EF80/EF184 push pull low watt amp and the preamp using the EF80 triode strapped. EF80 Mazda-Belvu p EF80. It took a couple of weekends, was a fun project, and pretty much does what I had hoped it would do – nice cleans with decent harmonic overtones and good sustain, goes up to moderately distorted output cranked, has a small footprint, sounds and plays like a bigger amp with good touch sensitivity and pick Feb 9, 2017 · WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES. A draft tube must be done with care and attention to the points table and routes filaments, and location of transformers on the chassis must be done properly. 5 for B battery. Output transformer96x40. The ECH81 looks like it could serve as a TRF front end, along with being a combined local oscillator/mixer. 50V x 0. It makes a great driver tube or general amplifier, also great in triode mode. Apr 11, 2008 · Just stumbled across this old thread . Apr 3, 2010 · My Quad II monoblocks each use two of these tubes. 64 kB, 800x1119 - viewed 1076 times. Quad Amplifiers Cryo Upgrade Kits. It can offer >=1100mW at 32Ω and can drive 18~600 ohm headphones & headsets. I was on a tight budget, and my main goal was to learn about tube/valve amp construction through this build, and not necessarily build the best possible amplifier. 67551 Worms . I built the cabinet last summer, planning for the amp to sit in the bottom of the cab. I have also ordered to output transformes. Als Treiber Röhre verwende ich wieder eine EF80 die sich schon in vielen anderen Schaltungen bewährt hat und die bei der niedrigen Anodenspannung genügend Treiberleistung erbringt. Absolutely GREAT !!! ST12: 2 ECC83 + 2 EF80 + 2 EC92: 4 EL84: EZ81 tube rectifier. The power supply is fairly standard but noteworthily it uses 50 year old electrolytics from a Philips radio, that still had their original capacity and almost no leakage. It took a couple of weekends, was a fun project, and pretty much does what I had hoped it would do – nice cleans with decent harmonic overtones and good sustain, goes up to moderately distorted output cranked, has a small footprint, sounds and plays like a bigger amp with good touch sensitivity and pick Feb 27, 2021 · I rewired the tube sockets, altered the OT 16 to 8ohm and 8 to 4 ohm windings, and fired up the amp with a voltage meter at the plate of one of the ef80's. The EM80 is tuning indicator. 339: ef80 mesh with La résistance anodique du tube est basse et le courant dans le tube est relativement élevé. If you like to build everything, maybe you could try the same feat with a homemade tube . xml; images/Miata/Miata2. Function of the suppressor grid Another grid we must care for… Oct 11, 2013 · In addition to Ayumi's SPICE models, I have generated following 18 models by Ayumi's method. 14', 'brand': 'TESLA Electron Tubes Brand New In Box Electro-Harmonix 6BM8 ECL82 Vacuum Tube Neutrik Nmj4hf-s 1/4. The rest of the circuits are: a radio-frequency amplifier with EF80 and with two tank circuits for providing band-pass filtering on the 80m-band. Push-Pull (PP) EL84 Tube Amplifier Schematic Other Push-Pull EL84 (6BQ5) Tube Amplifiers. com ). None of these tubes has ever given me any trouble. PREAMPLIFIER: The first portion of the amplifier is comprised of the EF80 tube and all the adjacent components. 5 W anode dissipation, the EF80 would be a more capable power amplifier than the 1. De EF80 en EF85 werden vervangen door de EF184 (high gain) en EF183 (remote cutoff), twee buizen met frame grids die betere eigenschappen hadden. 8a schematic/layout. Simple SE on GU-50 and EF80 . Dynaco Amp Schematics to assist you with your amplifier repairs and modifications. 1. I also used symmetrisation for the filament voltage, because the audio amplifier picked up lot of 50Hz hum. chock 96x40 transformer. L'étage déphaseur mullard utilise deux EF80 avec un courant de pratiquement 10mA, très près des limites du tube. pro. Click Here for Video Demo Other features / specs include: TAD 12AY7 NOS Amperex EF80 Pre-Amp Volume / Gain M Aug 2, 2011 · This is a project of stereo tube amplifier based on tubes ECL86 (two systems) and EF80 (pentodes used in triodes system with bridged S2 to anode and S3 to cathode) with speakers GDN16/10 with cobalt core and GDW6,5/1,5. Output: selectable. EF80 La Radiotechnique p EF80. 1 - 9. ) like new 2x ECC82 (Philips) like new 1x ECC83 (Philips) like new 2x ECC88 (Tesla, Philips) like new triode+pentode: 5x PCF80 (Tungsram, Ei, RR) like new 1x B4 and B5 are EF80 intermediate frequency amplifiers, B6 is the EQ80 FM detector and B7 is the EL42 audio power amplifier. United Kingdom. CV1---2 ECL86: Funny simple amp Simple vacuum tube audion This is a simple short wave receiver of audion type. It is a 2. The second tube 6CC42 serves as a two-stage amplifier (Y). This article is to teach you how to design, diy, out of a high quality tube amp. 2/320 = 13. thank you 使用西门子ef80和北京fu32制作一台单端功放资料，包括实际使用的电路原理图、外壳切割图纸等资料。 Order 6BX6 / EF80 vacuum tubes online, in stock and ready to ship! Find reviews, data sheets and specs to upgrade your tube amplifier. For drive tube I use EL803 (EL83 or EL803S) tube in triode connection. Earlier this year, I was finally able to start my build which is now complete. Das sehr großzügig ausgelegte Netzteil wird von einem Grundig Netztrafo aus einem Transistorreceiver gespeist, er hat eine gute Kupferschirmung und viele Tube Testers: 'Cartomatic II' GM7630 & 'Cartomatic III' GM7633 Using GZ34, 2x EL34, 2x EF80, EF86. Oct 8, 2008 · The EF12k and EF804s were used in many vintage german studio amps without any problems for years and years ( V72 and similar amps ) , the V74 used 5654 and E180F , the last one as output tube . PI and pre amp voltages can be taken from regulator where they do not sag at all. Oct 16, 2021 · This amp uses an EL84 (6BQ5). Epiphone Valve Junior Series Cryo ; Epiphone Valve Special Series Cryo ; Epiphone Valve Standard Series Cryo; Fender Cryo Amp Kits. 2. The preamp EF80 rang like a bell !! but when replaced with a frame grid EF184 it worked well. Mar 14, 2011 · IMHO, if you are going to use an EF80, Schade seems the most logical choice, running both the input and output in pentode. Circuit from all this studio stuff you can find here : tube AM shortwave transmitter that you can understand, repair, and even modify. I can't say i see any need for an additional regulator as both input and output run pentode, their near-current source behavior makes the output of the driver referenced to the supply rail, while it's input remains referenced to ground as usual. Hammond 269EX/369EX Power Transformer. Voltage stage consists of tubes Jan 9, 2022 · So with 320Ω Rk, that means 4. The EABC80 serves as 2nd detector, AGC rectifier, and audio voltage amplifier. 84 mA is plate current and 13. Feb 4, 2024 · I have a bunch of NOS EF80s on hand and I’ve built several of single-ended EF80 amps based off Rob Robinette’s design with great results. The amplifier is assembled based on a typical application of ECL 86 lamp with a speaker transformer TG 2,5-1-666. valve & tube boxes; valve amp tube sets; b - stock clearance; fuses ; el509s Nov 30, 2012 · Project: The Command 1625 tube amplifier Introduction: 6C6, WE310A, 6J7, EF86, EF80. Here's an absolutely fantastic sounding 5F6A Bassman "Micro" (Rob Robinette Design) desktop style amplifier that utilizes EF80 output tubes and puts out about 2 Watts in a 12" x 8" footprint. A. I am really looking for frequencies up to 20MHz not really more cause I dont have a CB or a reciever of any kind that could do above that (yet). 13 = 9. B. Preamplifier, phase splitter, power amp, feedbacks and power supply. Most TV’s in the fifties were full of EF80’s performing a verity of functions: RF, intermediate frequency and video amplification. I need help with combining these tubes and the transformers to an amplifier. Aug 2, 2011 · It is a simple stereo amplifier made of two old broken gramophones Bambino 3 and the casing from a DTV decoder. TUBE 2: 7. The amp uses a 6X4 tube rectifier. pdf (103236 bytes) (fr) EF80 : RFT p EF80. This amplifier goes from clean to overdrive, and sounds nice. Nov 11, 2010 · That's an AM tube complement. My main challenges will be fitting everything in that small chassis. The EF184 was the straight version of the design and replaced the EF80. It has 4 transistors, one is a very stable oscillator, followed by a buffer stage to. Note the position of the HV center tap and the full wave conventional rectifier wiring. 100TH 2SK79 4E27(Triode Strapped) 6H3/6N3 6H6/6N6 6H30/6N30 With all that said, I still believe that the RobRob micros are great sounding amps, they just don't "feel" like a big tube amp played at ear-shattering levels. Dual: CV 11 : 2 ECC808: 2 ECLL800: same as PE HSV20 : V25. New version adopts 6J3 vacuum & valve tube, which has warmer tube sound and more replaceable tubes. C'est une pentode avec un gain fixe, le tube ne peut pas recevoir de tension de réglage du gain. This is by no means a new idea as evidenced by my Grandson's string-fil line-powered 12AT7/2x12BA6 PP 4W Super Triode practice amp Jan 3, 2024 · I built a tiny 4 tube amp that could be stuffed inside a cavity in a solid body guitar. EF183. Jan 12, 2016 · EL153 \ EF80 is a very good performance of vacuum tube, many people can not properly use, resulting in the illusion of high frequency of inappropriate audio use. One is labeled Amperex and the other Mullard. Unknown Amplifier (html page) 2021-05-11 Precision Model 660 Aug 20, 2012 · Tube amps really do shine the most with the Sennheiser sound. Last night I found a nice pair of E180F tubes in my stock, would these be a straight swap :confused:seems the only pin out difference is that the screen is connected to Grid 3, all other specs seem close. Also build in switch for LOW/HIGH output power for spare tube life time. Parts used in this build that I had laying around were the Antek AS-05T200 and Triad C8X choke. shop@tubeampdoctor. I wanted to use the Max1771 SMPS (from desmith), so I looked for tubes with lower plate current, and the ECL84 with 18mA was low enough. 37dB does sound a lot damn. In the sixties, the EF80 in turn was succeeded by the EF184. The Hammond 125B five watt output transformer wired for 22. The third tube is a GD150M/S gas discharge regulator used in the alternative, and somewhat simpler HT regulator shown below. pdf (102552 bytes) (de) EF80 WF p EF80. Weinbrennerstr. This amplifier is hand-wired by myself - all parts sourced and selected to offer a top quality amplifier at a very reasonable price. Deluxe Micro EF80 Uses EF80 small pentodes for the 2 watt power amp. 6AU6, EF37, etc Different rectifiers: 5U4/G/GB is the Octal version of the 5Z3. This would put the EF80 only a few inches from the electron Tube Data sheets - E. com). Tension alternative sur la grille de commande de 400mV, tension sur la cathode de 200mV. Das besondere an diesen drei Röhren ist der Aufbau des Schirmes. W R core Transformer For Audio Amplifier DAC preamplifier output voltage 20V 15V. Jun 4, 2014 · Let them shine Four-channel power amplifier located at bottom of home theater system, this is simply four of the class AB power amplifiers described previously. Coincidentally, the first name of this amp was 100Buck Amp. View media item 328761 May 24, 2023 · Bonsoir, La EF80 est pour moi, un peu la bonne à tout faire, j’en ai utilisé sur un ampli de ma conception en pré-ampli BF pour attaquer de très classiques EL84 (et en ampli d’erreur sur l’alim régulée) et ça fonctionne parfaitement bien. El84 se tube amp. Tube Testers: 'Cartomatic II' GM7630 & 'Cartomatic III' GM7633 Using GZ34, 2x EL34, 2x EF80, EF86. Natural wood plinth 14x10x3 inches. Bruxelles (Mazda). V4 & V5 are EF80 nine-pin pentodes in true push-pull fed by an LTP phase inverter for 1 watt of output. The 269EX/369EX is a good choice for any amp using an EF80 power amp but it does not include a 5v secondary so if you want to use a tube rectifier use an EZ81 (6. We have various European brands available. Feb 16, 2013 · In my initial reply I suggest an unbiased low power amplifier arrangement (in the vernacular of the 1930's) "Super Triode" Pentode AB or B Push-Pull Amp" (G2 to G1, not G2 to P). Single-ended class A amps were used in many lower power 1950s-60s Fender Tweed and Blackface amps and in Vox's AC-4, which also used the EL84 tube. pdf (881094 bytes) (de) EF800 May 30, 2022 · Decided to create a thread of my JCM800 EF80 build for posterity. Le tube était parfois utilisé dans le tuner (VHF bande I uniquement) et comme amplificateur vidéo. Antenna to tube into another tube and then the reciever itself. And those who disseminate high-frequency tube audio is not well people use the rumor nowhere to hide. Small Single-Ended Pentode Champ Micro The audio-frequent pre-amplifier is an EF80, and the output stage is planned for two EF80s connected in parallel to increase output power. 7 W ECF80 pentode. I have two EF80 tubes and will get two EL84 tubes from a friend. The plants were large and the processes very labour intensive by todays standards. The power supply groups are: +2250V for the power amplifier tube RS1002A plate power supply; -320V for the power amplifier tube RS1002A grid Power supply; +500V is the power supply for the RS1003 plate of the drive tube; +80V is the power supply for the EF80 plate of the preamplifier. Lamp power supply 5U4. 26 mA is screen (from EF80 data sheet, screen current is 25% of cathode current at Va = Vk = 250V) Mar 7, 2008 · Combine EF80 with El84 This is the first time i'll build a tube amplifier. jpg (554. All-Audio. It hadn't been done before and inspired Rob to make a better design. The 68k grid stopper on the EF80 may be rather high, unless this is intended to be guitar amp. VVS: 3 ECC83. My hunch is that this amp will have a lot of gain, and could suffer from overloading in the EF80 stage. It was made in spatial installation method. Rob Robinette's Car and Tube Amp Website. Unknown Amplifier (html page) 2021-05-11 Precision Model 660 LA Audio is a Taiwan-based maker of audiophile hi-end tube amps and preamps. Plate voltage was way above the max 300V. com. Like the EF50 all grids of the EF80 were accessible for optimum freedom of circuit design. An electron tube with five electrodes is called pentode. Aug 10, 2011 · Hi I have a little headphone amp running Mullard EF80's or EF184 (much quieter). Plugging that into the formula for NFB I got a gain reduction from 225 to 184, 1. Built an amp using an EF86 in the preamp, and since I had an extra hole in the chassis, and an extra EF80 laying around, I wired up an extra socket in parallel, correcting the appropriate pins, and tried comparing the circuit alternating the tubes -- both sound fine -- just did it for a few seconds, and haven't taken any measurements yet. Usually single power tube amps are Class A and amps with two or more power tubes are Class AB. Descriptions; Tube DIY Asylum; Ef80 tube amplifier; WATCH RELATED Nov 22, 2018 · A very good 1 watt fm transmitter circuit, very easy to build circuit. The EF80 internally screened pentode was a workhorse of the VHF TV receiver and was introduced in mid 1950 to replace the EF91. Dec 8, 2013 · The PL36 needs a grid leak resistor. Power supply is built on a single transformer TS 40-29-676, which is One Tube Regenerative Radio: Saturday, January 22, 2011 10:36:23 PM: It's been many years since Tandy corporation has put out th one tube radio kit. Welcome To the Hoffman Amplifiers Forum March 16, 2025, 04:31:18 pm : Welcome, Guest Apr 30, 2024 · Hoffman Amplifiers Tube Amp Forum, Robrob slo ef80 amp build question . It also can be used as an additional control grid. which operate at zero-bias. 3v). Now, really wail hard on those guitar strings, and turn the amplifier gain all the way up . • Oscillator 6BX6 (EUR = EF80) • Power Amplifier 6CJ6 or 6DR6 (EUR = EL81) Dec 13, 2020 · New Old Stock EF80s (also called 6BX6) are inexpensive at around $6 and the supply is plentiful. The voltages required were different although. com May 21, 2012 · Just finished monoblocks with RS1003 ( SRS551) tube in SE-ClassA triode (option UL) connection. The EF85 was the variable μ counterpart to the EF80. 174777 second(s), 17 queries . Crack for clarity and speed and 339 for smooth tube tube warmth and musicality. ) Amp Audio Upgrade Kits Cryo. Hammond 269EX/369EX Power Transformer Valve (Vacuum Tube) Amplifier Design Considerations; Cw-!-feruary; Welcome To the Hoffman Amplifiers Forum; Ef80 tube amplifier; Tube DIY Asylum; Old Grundig reel to reel. You assumed a single stage amplifier but yeah I have two of those tubes. It was described by Mullard as: a high slope RF pentode and not a variable μ type. Cool! Sep 3, 2020 · Its designed as an IF amplifier not as an audio tube that's why its WORKING voltage is around =200V/200V I have never run it at its limit . You may need to check what range of g2 voltages is appropriate for the EF80. All four valves have the same pin connections. Mar 7, 2020 · Stereo tube amplifier ECL86 and EF80 OCTAVE technology entails a further developed tube amplifier topology utilizing an innovative, independent approach until the traits that correspond to the company philosophy are achieved: powerful dynamics, low noise, wide bandwidth, incredible stability, extended lifetime, and comprehensive safety. It was loaded with a CCS made from an LND150 mosfet which fed a second LND150 that was the PI. tubeampdoctor. Veronica 1W FM transmitter is an easy to build transmitter. Actually, you can get super sweet and harmonically rich distortion with a guitar and also connect channels in series to get more gain. I'm trying to decide the best way to insert it. The EF80 can also be used in the preamp like the EF86 in many early tube amplifiers. The plate Volts spends 50% of the time at 50V, and 50% of the time at 350mA. Pretty rare single ended EL84 stereo amp with EZ81 tube rectifier. Transformer size 96x60. 35A x 50% = 8. I'll take a guess that it's SW capable. (Available!) 6,800 = 100% 1960's Ulm West Germany production The West German Telefunken EF800 is the BEST choice for a PROFESSIONAL EF800 mic or amp application! PROFESSIONAL EF800 Pentode SINGLE VALVE TUBE TELEFUNKEN EF80 UPGRADE! Feb 20, 2022 · The amp chassis contains only the 6BQ5s, no input tube at all. It consists of three tubes: full-wave rectifier in 6Z31 eliminator, RF pentode EF80 as a high-frequency stage and low frequency power pentode EL84 as output audio amplifier. Although it's not optimal or producing full power output, the thing actually plays fine with a line level input from an Apple Airport Express with the volume controlled by the computer. Jul 28, 2023 · Let me say first, the conversion from a cathode biased 2w “mikro amp” with a toroidal power xformer, a cap can for filtering, and two noval output tubes to a fixed bias 40w amp with a laydown power x former, large 80uF filter caps, huge output iron, huge choke, and two octal output tube sockets was traumatic to say the least. For EL153 tube can go casual with power dissipation up to 40W. The type was introduced in 1950. Aug 25, 2015 · NS-08E is a Hi-Fi tube headphone amp. Mar 24, 2020 · A two stage amplifier would be fun too. Le tube EF80 est une pentode préamplificatrioce utilisée princiupalement dans la partie moyenne fréquence des anciens téléviseurs. Simple SE on GU-50 and EF80. Feb 14, 2021 · THey came from Langrex, as did the CV1376 which I think are military spec EF80. images/Guitar/HowAmpsWork Apr 29, 2021 · Hi all Finished my first guitar amp build. Welcome To the Hoffman Amplifiers Forum March 16, 2025, 04:31:18 pm : Welcome, Guest Guitar Tube Amp Kits; Bud Guitar Tube Amp Kit; Classic British 18W Tube Guitar Amp Kit - 1x12 Combo; Classic British 18W Tube Guitar Amp Kit - Head; Classic British JTM45+ Tube Guitar Amp Kit - Combo; Classic British JTM45+ Tube Guitar Amp Kit - Head; Tweed 5E3 Vacuum Tube Amp Kit; Tweed 5F1 Vacuum Tube Amp Kit; Unassembled Mojo 1965 AB763 May 26, 2023 · Hmm, that sounds like what some guitar amplifier designers do to get more power from the amplifier. adv-ef95-1. 75 x 13. The EF183 is a high gain variable μ RF amplifier pentode. Selectivity is increased due to higher transconductance. Dec 13, 2020 · The EF80 version of the Bassman Micro LTP uses two EF80 pentodes in push-pull for true pentode power tube overdrive with 2 watts of output. Tubes were selected for low heater current power. The EF80 was produced in enormous numbers. EF80 / 6BX6 TELSA / NOS-NIB Service/Help Tube Amp Doctor Musikhandels GmbH . Much used for RF, intermediate frequency, and video amplification. Strange cabinet design. Fender Hot Rod Series Valve DE EF80 is een high gain pentode, de versie met remote cutoff is de EF85 die nogal zeldzaam is. philips 6bx6 ef80 z152 z719 nos tubes valves - in stock - fast shipping - australia. Made in Great Britain at Philips Mitcham factory, they have gold pins and a dimpled disc getter. This is a 1 Watt push-pull pentode SLO-100, Overdrive Channel only with FX Loop and Switching deleted and laid out for a Princeton Reverb chassis. ga('set', '&cu', 'EUR'); ga('ec:addImpression', { 'name': '6360 / QQE03-12 / RS1029 Duo-Tetrode', 'id': 'S6360', 'price': '8. Oct 26, 2015 · Given that post World War II subminiature vacuum tubes are primarily used as a cost saving preamplifier and phase-splitter sections of power amplifiers that use 1930s era output power tubes, the World Audio Design K6L6 Integrated Amplifier is probably the most famous application of the ECF80 triode-pentode vacuum tube where it was used as a “novel” phase-splitter. After some reading I tought I could build one in a 1590 box. speaking of cathode followers, I mostly switch to ZETEX ZVN0545A (Thanks to Eli Duttman) because even after hours, I can't hear a difference to a (proper) tube. . LA Audio M3 -A Vacuum Tube Amplifier M-3 Integrated Vacuum Tube Amplifier With remote control Power output：20W x 2 Frequency response：10Hz～30KHz. This is a EF80 push pull power amp intended for guitar use derived from a design Rob Robinette created and shares on his website (robrobinette. This amplifier uses a 12AY7 for the preamp tube and an EF80 for the output/power tube. [Philips TX400 Service Manual] After the first-generation television receivers TX400/500 the EQ80 was used in one more generation of Philips sets: the TX701 projection TV and the TX1400. Jul 20, 2021 · If it is for audio purposes with the ECH81 as a voltage amplifier and phase-splitter (it was used like that in some tube radios with a push-pull output stage), than the answer is no because in the ECH80 the control grid of the triode section and grid no. It sounds much, much better. pdf (764273 bytes) EF80 La Radiotechnique 5E3M Deluxe Micro Amp The Deluxe Micro is a compact amp which attempts to capture the magic 5E3 tweed Deluxe tube guitar amplifier tone in an easy to build, two tube, 1 watt output practice amp. So I connected the grid (el84 pin 9, EF80 pin 8) to B+2 (the same as the phase inverter). NOS TUBE MUSEUM QUALITY EF800 Telefunken West Germany Very low noise clear, accurate, detailed, long life VERSION OF THE EF80 6,800 = 100% These tubes test 6,800 or 100% Serial number: from = 1960 - 1968 Ulm West Germany production The West German Telefunken EF800 is the BEST choice for a PROFESSIONAL EF800 mic or amp application! May 16, 2024 · Hoffman Amplifiers Tube Amp Forum, Funky local NFB on EF80 single ended power tube? Welcome To the Hoffman Amplifiers Forum April 20, 2025, 10:25:18 am Feb 24, 2019 · Their review: Our Preferred Series 7189 tube is a versatile high quality option for EL84, 6BQ5, and 7189 tube circuits because of its clean headroom, power, dynamics and harmonic content. It's original use was for IF in receivers, so low microphonics were never a design goal, that being said, there are good ones out there. Any Apr 30, 2024 · Hoffman Amplifiers Tube Amp Forum, Robrob slo ef80 amp build question . 5 V for A battery and 22. 2W amp, EF184 + 25L6 tubes, with a really good sound. GMT+8, 2025-5-17 00:40, Processed in 0. Dec 28, 2012 · EL153 power dissipation for final tube is 30W and is located beneath the anode dissipation hyperbole. The other amp has a pair made by Ediswan Valve. Zwei sehr frühe Typen zeigt das folgende Bild. Mar 3, 2008 · EF80 is a very common pentode that can be used in audio, assuming you get a particular piece that is not microphonic. jpg; How Amps Work. One amp uses tubes made by M. 84 = 3. US $ US $ 8% off. 5w per triode. More info on the amp here. 5751 Ef80 tube amplifier; 6BL8/ECF80 Medium-Mu Triode Sharp-Cutoff Pentode GE Electronic Vacuum Tube; Welcome To the Hoffman Amplifiers Forum; EL34 / EL84 Based Tube Amps; 2pcs 6F1P (6Ф1П, ECF80 ,6BL8, 6AX8) Triod-Pentode tubes HiFi AMP, NOS in Boxes; Experimental Kit Vacuum Tube Technology RT100 - Elexs Tube Type and Plate-to-Cathode Voltage must be entered for all calculations on this webpage. Veronica is also known for frequency stability, clean FM signal and uses no integrated circuit. The Amperex 7643/ECF80 tube is a vintage NOS tube from the early '80s. I haven't pressed it into a bunch of different applications at this time but it sounds good to me and compares favorably to both the 6267 & 5879 so far as I can tell in a SE amp. Still considering the ef80 swap, but dont feel I need to do something. com can make you a Blackvibe Micro EF80 turret or eyelet board using this Hoffman Board File for about $20 + shipping. If you like this amp but would like a little more gain check out the JCM800 Micro EF80 . 3 of the hexode section are internally connected, while in the ECH81 they are not. Dynaco ST 70 II Schematic Owners Manual · Dynaco ST70 Schematic. To make my scope simple and nostaligic style, I decided to use vacuum tubes. European Brands EF80 / 6BX6 This pentode was used in Intermediate Frequency amplifiers for many types of equipment: radio, Radar but probably best known as the dominant workhorse of VHF television receivers. I don’t know what it is about the Marshall 2204 circuit but when I built mine with 6V6s it was as loud as a 50 watt amp. jpg; Amp Stuff. Output Selectable Shows below. A 240 ohm cathode resistor is also a perfect match for a 2xEF80 amp. The 6BX6 also known as the EF80 is an internally screened pentode and was a workhorse of the VHF TV receiver. It did not completely disappear but brought it down to a bearable minimum. Rob Robinette Champ Micro EF80, a little speaker cab and a 10% power switch for late night action. Amps with power tube cathode resistors greater than 10 ohms are usually cathode biased. The EF80 pentode uses standard 9-pin sockets and 6. This amp is exceptionally quiet and works great for rehearsal, small venue use, and especially studio recording. Chassis was a custom order from Seaside Chassis Design in 14" x 7" x 2" aluminum and I highly Jan 3, 2012 · EF183 can be used with good results instead of EF89 (which is the typical IF-tube in german radios) in tube-receivers. Click Here for Video Demo Other features / specs include: TAD 12AY7 NOS Amperex EF80 Pre-Amp Volume / Gain M Sep 20, 2021 · I just finished a small practice amp project with a speaker defeat and headphone jack. Mar 21, 2008 · Hello I have a lot of new and used tubes, but I will write only those that may be usuable for audio: Dual triodes: 1x 6CG7 (U. As a saw tooth (X) oscillator I am using RF pentode EF80 (fantastron connection). FWIW, it's impractical for me to play at such ridiculous volume levels, so my Vox VT20+ gets the most use out of all my amps. UralTone EF80 Tube Stereo Preamp is an all-tube preamp working with an external 6VAC power supply. Thread starter The result is a three-tube design which is visually quite appealing (right), shown here with EF80 tubes. The EF89 is the IF amp. I've done point to point audio amps before, most recently a Kegger Blueglow KT88 so the whole turret board thing was new to me. Jul 11, 2019 · With 2. Mar 8, 2019 · The EF80, by the way, is essentially an EF50 with a different base — that tube helped win World War II. Nov 9, 2020 · Ella Push Pull EL34/KT88 Amplifier Schematic; El34 amp schematic; Chapter 6: Step by step design of a push-pull vacuum tube amplifier; El34 amplifier circuit; EL34 Push-pull Tube Amp Kit [ TU-8340 ] Push Pull Tube Amplifier; Ef80 tube amplifier; El84 Guitar Amp Schematics; Designing an EL34 Class A Stereo Amp May 29, 2017 · Zp-p = (120 to 180) x Sqrt(tube Pdiss Watts spec)/(tube max DC spec in Amps) 120 for max power, 180 for low distortion, or in between for in between results. Doug Hoffman at HoffmanAmps. The internet is amazing! Ado_PO: One Tube Regenerative Radio: Monday, September 28, 2009 4:11:11 PM Aug 3, 2021 · I finally decided to increase the shared power tube cathode resistor, which I had changed from 470Ω to 1kΩ earlier, by adding 250Ω in series. I used Rob's V3. Aug 2, 2011 · This is a project of stereo tube amplifier based on tubes ECL86 (two systems) and EF80 (pentodes used in triodes system with bridged S2 to anode and S3 to cathode) with speakers GDN16/10 with cobalt core and GDW6,5/1,5. Apr 8, 2025 · I just finished a small practice amp project with a speaker defeat and headphone jack. Die Valvo und Telefunken EF80 haben noch die alte (frühe) Version des Pressglastellers, die Siemens EF80 ist dagegen schon eine neuere Ausführung. Quad 11 Original Power Amplifier 1953 to 1970; Amp Kits Cryo- Valve & Speaker Upgrades . 3v) tube rectifier. The tube acts as a small signal voltage preamplifier, with an adjustable gain of 2-3 times (6-9dB), by Jun 4, 2017 · You will notice that the input stage for the two previous amplifiers in the tube manual [designs 27-9 and 27-10) is identical; there it is done correctly (as in the Mullard 5-20 et al)]. As a symmetrical driver of X and Y plates I used a double RF triode 6CC42. Jan 24, - Dynaco Dynakit Stereo 70 (ST70) Tube Amplifier Schematic and Instructions Manual for Assembly and Operation. pdf (401856 bytes) (fr) EF80 Philips p EF80. 001 if the cathode impedance of the EL95 is ignored. I have never rolled them so I can't tell you how they compare to other EF86s. Feb 12, 2020 · I have an AB763 based amp (Rob Robinette Blackvibe Micro EF80) that I want to add reverb too. (or use "76" for fried 6L6s or "88" for the fried EL86!! Jan 29, 2019 · Building a tube amp has been a dream of mine for a couple of years. 😀 The matter of power supply is, most if not all tube designs use a multi stage filtering which also gives multiple voltages for respective gain stages. Dec 13, 2020 · Last December I was looking at using a bunch of old '50s Mullard EF80 (and its younger bro from the '60s EF184) pentodes I had gathering dust. Canada Rate (item arrived) % 1% % % %. Mar 17, 2021 · HB-1 Amp - An EF184 + 25L6 2. Nowadays it's popular for microphone amplifier applications. 4mA/V. Some power tube sag can be added to PI and/or pre amp taking current between tube sag-diodes and sag-resistor. Also great in the Dayton Audio HTA20BT and HTA100. 76 db. 5K:8 ohm is a near perfect match for a pair of EF80 in push-pull. Antique Radio Forums; Grundig Majestic - Worth Fixing? Apr 10, 2023 · * EF80 as per rob’s specs * torroid but with additional EMI filtering * tempted to add an inbuilt tube screamer stage, depending in stability, * switchable SS/tube rectifier * addition of a tube reverb at a later date Now I’m considering a 8R Creamback Alnico but broken in on a 50W amp. One thing I do notice which is missing in most pentode output stages and done correctly here, is to load the output with a finite resistor so as to avoid Jul 3, 2019 · Hi All I have used EF80's in a 5-10 stereo amp in place of the EF86 and ECC83 ( the push- pull output used PL508's in place of the EL84's). If you are looking for a plugin replacement at a lower gain another IF amplifier in that rage earlier was the ubiquitous =EF80 used by the 1000,s in many old valve UK TV,s gain=7. It is a late 1950s design and superseded the EF85. www. This tube can substitute for the common 6BL8 and is a great choice for vintage McIntosh MR-67 tuners. De EF85 werd voor automatische gain regeling toegepast op de eerste MF trap. HIFI amplifier spare parts center Store. Pentodes overdrive differently than triodes due to their screen so this is a way to get pentode overdrive in a 2 wattish power amp. . The EL84 is the audio "final". Dynatron used the Z77 (EF91) for AF purposes in its LF612 and LF613 amplifiers, albeit triode-strapped. Output power is 11W or 15W in triode connection, and 16W or 22W in UL connection. Jul 18, 2022 · FWIW (different, PP amp, lots more tubes to drive) I was able to use the 220 tap (on a bigger 240-nominal Antek) for my EF80 Bassman Micro, so the 200 tap might work for you. Rate (item arrived). 13 mA, where about 0. L. Epiphone Cryo Amps Kits. The amplifier has two on-board 7812 regulators. Here's is an absolutely fantastic sounding, freshly built, Champ Micro based off of Fender's legendary 5F1 Champ circuit. Using a resistor the sag come very similar the rectifier tube cause. 2W guitar tube amp I forgot that I had posted an old version of this scheme here, in the The Hundred-Buck Amp Challenge thread, until an user of a Brazilian forum reminded me of it today. 出力：15w＋15w 真空管：ef80 12bh7a 83 rs289 出力トランス：tsm 隠れた銘球ドイツテレフンケンrs289を使ったプッシュプルアンプです。 繊細な、黄金色の音色が美しい音を奏でます。 出力も15wある為元気な音で、能率の良いスピーカーを十分に鳴らしきります。 Sep 6, 2014 · There is more information available about tube power supply design in the Power Supply Design for Vacuum Tube Amplifiers article. The EF80 was much used for RF, intermediate frequency, and video amplification. 800 (115%) Originally numbered Retail Blue & Red Color Box. 75 Watts plate dissipation. The push-pull EL84 tube amplifier schematic is from the book "Build your own Audio Valve Amplifiers" by Rainer zur Linde. The FB factor looks like 0. Bluetooth Tube Amplifier Stereo Receiver - W Home Audio Desktop Stereo Vacuum Tube Power Amplifier Receiver w/ 2 Vacuum Tubes, AUX/MP3/Microphone Inputs. This brings the power tube dissipation to around 2. 3v heaters so they are easy to implement into a modern amp build. sitemap. this is their C-22 stereo line- level preamplifier, with 3 inputs and one output Two 12AX7 and two 12AU7 triodes are used Brand new in box, NOS (New Old Stock), fully checked, burned in for 8 hours and auditioned, sounds surprisingly good with stock tubes, even better with vintage USA- and UK-made ones - tube roller's In meiner Sammlung befinden sich etliche EF80 in unterschiedlichsten Ausführungen. Like 6AQ5s, the EF80s are still very affordable for NOS tubes. Jun 19, 2015 · OK, I see what that 150K resister is doing now. And, I guess, eliminating problems with microphonic tubes. View media item 328761 The 269EX/369EX is a good choice for any amp using an EF80 power amp but it does not include a 5v secondary so if you want to use a tube rectifier use an EZ81 (6. Soldano SLO-100 Based 1 Watt Amp With EF80 Power Amp. My plan was to try the one tube 12DW7 reverb in lieu of the full blown Fender reverb circuit. hbjyl iexlw tkvkrese plsmtz pbzox ywwrtz camjtz jnyaz pkknht bkfa