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output transformer

  1. Stavee

    OPT Primary Impedance Matching to Power stage?

    I'm new to tube amps, and trying to learn a lot real fast. The set up I'm wanting to do is two KT-88's in PPUL fixed bias. Going to run them at 460v B+ for the neighborhood of 70W. Don't want to burn them out too soon seeing as they were quite expensive. So on to my questions which will reveal...
    • Stavee
    • Thread
    • impedance matching output transformer power tubes
    • Replies: 9
    • Forum: Tube Audio
  2. in_civvies

    OT question, with a Philco electrostatic: did I blow it?

    Been running a pair of philco electrostatic panels (the semi-cylinders, from the 1959 consoles) as tweeters in a triamped system. Was sort of an elaborate experiment, conducted with aesthetics in mind as much as anything else, and it was working well until yesterday…I was making a stand for one...
    • in_civvies
    • Thread
    • electrostatic output transformer philco
    • Replies: 5
    • Forum: Tube Audio
  3. cabsodyinblu

    Fisher 500c Output Transformers

    Hello AK’ers I’ve been on the hunt for months for an original output transformer for my wonderful 500c but no luck on the auction site. Can anybody recommend where I could find a replacement or a rewinding/rebuild service? I’ve tried to reach out to Transcendar but he replied back that he’s...
    • cabsodyinblu
    • Thread
    • fisher fisher 500c fisher 500c 800c output transformer tube
    • Replies: 44
    • Forum: Fisher
  4. richiem46

    Fisher KX-100 (X-100-B) Output Transformer source

    Starting this thread to try and find a source for output transformers for the Fisher KX-100 (X-100-B) amps. Transendar seems to be out of business and I am looking to pick everyone's collective brains for a source for replacement transformers. The transendars were great but......... All help...
    • richiem46
    • Thread
    • fisher kx-100 output transformer x-100-b
    • Replies: 42
    • Forum: Fisher
  5. Kevin Croak

    Sansui 1000A Hashimoto OPTs

    Hello, Can anyone tell me the Hashimoto replacement part number is for the OPTs in the Sansui 1000A receivers. I have the 410-5234A and B numbers, but cant seem to cross reference. Someone said Transcendar made replacements, but their website is down. I would like to find a set or a replacement...
  6. T

    Help with H H Scott 299B

    Hi folks, first post here, hoping someone can help me with my 299B. I'm a little rusty in the tube department, my first training was in 1971 and that quickly moved on to transistors and IC's. I have had a wonderful (partially restored) 299B for about 12 years now and recently it got a bit...
  7. D

    Riverside California Check in

    Hello I am new here on Audio Karma, despite the screen name "dougroundup" (which is my middle name and the street where I am located) My actual name is Brian. I suppose I just compromised alot of personal information! OK well, I am also a amateur radio operator and I have a part time job...
    • dougroundup
    • Thread
    • amplification fender gibson guitar ham radio marshall output transformer plexiglass tweed vacuum tubes
    • Replies: 16
    • Forum: Introductions
  8. geiman

    W-5-M Replacement OT

    Got a W-5-M Heathkit in need of an output transformer. The original died and the old stock and used are nearly unobtainium at least at a reasonable price. I'm more concerned about function than originality. So, I'm looking for something that matches spec wise and will fit the chassis. Any...
    • geiman
    • Thread
    • heathkit output transformer w-5-m
    • Replies: 4
    • Forum: Tube Audio
  9. Vez

    Could my Output Transformer be Shorting Against It's Frame?

    Has any one heard of such? Hello everyone new member here. I have a 1949 Gibson GA30 with the OT mounted on the speaker basket. The amp is working. I just replaced some plate resistors and some coupling and tone capacitors. When I touched the speaker I became acutely aware that there is...
    • Vez
    • Thread
    • output transformer
    • Replies: 10
    • Forum: DIY
  10. thorpej

    Push-pull OT phasing

    I'm a little confused as to how to think about the phasing of the Hammond 1650HA OTs I'm using in my 6L6GC ultra-linear amp. As I understand, the dots on a transformer schematic indicate the start of the winding. But I seem to recall that how the windings are oriented towards one another can...
    • thorpej
    • Thread
    • feedback output transformer phasing push pull
    • Replies: 12
    • Forum: Tube Audio
  11. QSilver

    Help identifying this amplifier design - Totem Pole?

    I'm working on an organ with some solid state amplifiers that seem to have output transformers on them. One of the amplifiers is working okay but the other is making a lot of rushing water, flapping and crackling noises and doesn't output audio. I plan on rebuilding it but I wanted to know how...
    • QSilver
    • Thread
    • amplifier output transformer totem pole
    • Replies: 56
    • Forum: Solid State
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