• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

ibam

  1. 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
  2. daylite

    Transistor-Buffered Zener Regulated Bias Voltage Supply

    A bias voltage design for TA-500, K-100, 500 Mono that's suitable for vintage & modern output tubes. There have been several discussions of the design of the Fisher “bias-voltage from heater-string” method that Fisher used to generate the negative potential needed to bias output tubes. Dave...
    • daylite
    • Thread
    • 500 mono bias adjustment bias voltage ibam k-100 ta-500
    • Replies: 3
    • Forum: Fisher
  3. Rockyhill

    IBAM on 500B, a couple questions

    A fellow AKer very kindly sent me an IBAM circuit he built. He hasn't been available recently so I'm posting a couple questions: http://akdatabase.com/AKview/albums/userpics/10004/Fisher 500-B Service.pdf R129, R135 and C85 are removed? Connection "V" is removed at the 200k grid resistors...
Back
Top Bottom