push pull

  1. Squidward

    Kegger Schematics Mega Thread

    I'm going to start this thread with a specific aim: To preserve the knowledge that Kegger freely gave our community. This thread is for posting schematics that Kegger created. He designed some very popular amps (KT-88 SEUL, for one), but he also has some lesser known designs that shouldn't...
  2. fink lever

    Valve Amplifier valve identification

    Hi all and merry christmas!!! I currently have an unusual custom vintage hi fi cabinet that i would love to get up and running. Looking at the unit it seems to be a 'Main Amplifier, an AM Radio Amplifier and FM Amplifier.' Lots of valves and transformers and not built for power but detail as it...
  3. Schmidlapper

    6v6 PP choosing between 9k and 12.8k tran

    I have a great sounding and looking little rebuilt Magnavox 8802 that really is limited by the output transformers, I also have an old pair of 30w PP transformers laying around, so I think to myself project time. I just don't know which load would be the better option. RCA says 10k for 6V6 pp...
  4. 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...
  5. thorpej

    Brainstorming a push-pull 6L6GC stereo amp

    I don't really need another project in the queue, but I have a bunch of nifty parts in the garage and can't help myself... I have a few nice, beefy MusicMan SS guitar amp PTs that will work well with a 4x voltage multiplier to get 395Vdc or so, with plenty of current capacity. I have a bunch...
  6. S

    Can you identify this tube amplifier?

    12ax7 / 6bq5 (7189?) stereo push-pull tube amplifier / console pull. Seems to have a half-wave solid state rectifier (two diodes). OPTs are labelled 1221 and 9496237. RCA and wired speaker outputs (black/red wires). 6 pin molex on chassis, and 4-pin molex on harness. Auxillary power outlet and...
  7. buck1108

    Fender M-80 Bass Amplifier making distorted output

    Hi, I'm pretty new to diagnosing electronics, although I've built kits for several years. I've been working on a Fender M-80 bass amplifier (circa 1993) which has a distorted output. The signal is clean (in scope wave reading and audibly) through the pre-amp section, at least to the "effects...
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