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efb

  1. G

    ST35 with EFB channel imbalance

    Hi folks — My ST35 (from a Dynakit Parts kit) with EFB had been running perfectly for months until a couple of days ago when one of the EL84s red plated. I traced that to a bad coupling cap; so I replaced the caps and the tubes (new matched quad). The amp will now hold bias. The only problem...
  2. Jxmos

    Fisher 660-A Stand Alone IBAM or EFB, ETC.

    I'm working through the mods on a Fisher 660-A stand alone amplifier and have a couple questions for the experts. I've found a number of posts on this amp and lots of helpful information but I've not found examples of Dave Gillespie's Enhanced Fixed Bias (EFB) Regulator installed into a 660-A...
    • Jxmos
    • Thread
    • 660 680 amplifier console efb fisher ibam standalone
    • Replies: 12
    • Forum: Fisher
  3. daylite

    Fisher 500C restoration and modification project

    PCBs: IBBA......EFB......Buffer......Phase Inverter TAPE MON to AUX input......Tone Control Bypass TAPE HEAD input to AUX input 500C selector switch function animation Loudness contour modeling and component selection This project is close to an end. A signal strength meter problem came up but...
    • daylite
    • Thread
    • bypass efb ibba loudness circuit phase inverter selector switch tape monitor tone control
    • Replies: 108
    • Forum: Fisher
  4. RUmad

    Magnavox 9304 DCG troubleshooting help

    Apparently I messed up my Maggie today. It’s a 9304-00 that I modified to the DCG circuit, but with original OPT’s and no buffer. I don’t use it VERY often, but when I do it’s been perfect. Always reliable, sounds great, runs nice and cool. I finished building a prototype preamp a couple weeks...
    • RUmad
    • Thread
    • 9304-10 efb magnavox
    • Replies: 21
    • Forum: Tube Audio
  5. S

    EFB installation trouble

    Today I attempted to install an efb board following as closely as possible to the "modifiy the fisher 400 with efb" forum. I followed the schematics as close as I could also looking at pictures as well as I could to make sure things were in the right spot anyways, I fired up the receiver and...
    • streetwise
    • Thread
    • efb fisher 400 modification troubleshoot
    • Replies: 16
    • Forum: Fisher
  6. thorpej

    A modified Magnavox 8802 in the Gillespie style

    Having cleared a couple of projects off the bench, of course it's time to start a new one. As you may recall, I built a Magnavox 8802 clone for my daughter last year for Christmas... I was planning to do the same for my son this year -- holy cow if the stuff isn't THE SAME, sometimes you sure...
    • thorpej
    • Thread
    • 6v6 8802 9302 efb magnavox
    • Replies: 86
    • Forum: Tube Audio
  7. thorpej

    Silvertone 528.59441 console amp

    I have this old Sears Silvertone 528.59441 console amp, from a Sears Silvertone model 70A console (AM/FM tuner, turntable, tape input, 1 external speaker for stereo). It was the listening device in my office for a spell, but was replaced by my Magnavox 8802, at which time the Silvertone took up...
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