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  1. K Teacher
    Post

    Grid-Leak Bias Phase Inverter?

    I want to apologize to all… I guess I asked the question in the most cumbersome way… Putting it in other words: Tone-wise, how does a grid-leak...
    Post by: K Teacher, Aug 21, 2020 in forum: Amp Tech Center
  2. K Teacher
    Post

    Grid-Leak Bias Phase Inverter?

    Hi Ten Over, Thanks for the detailed explanation... I understand that the voltage at the cathode node follows the voltage at the 68K-to-ground...
    Post by: K Teacher, Aug 21, 2020 in forum: Amp Tech Center
  3. K Teacher
    Post

    Grid-Leak Bias Phase Inverter?

    Hello tubeswell, Thanks for your response. I always thought that the bias point needed to be centered on the load-line... however, looking at the...
    Post by: K Teacher, Aug 21, 2020 in forum: Amp Tech Center
  4. K Teacher
    Thread

    Grid-Leak Bias Phase Inverter?

    Greetings, I read several articles on cathodyne phase inverters and how to improve their response to overdrive. And then, to my surprise, I...
    Thread by: K Teacher, Aug 21, 2020, 5 replies, in forum: Amp Tech Center
  5. K Teacher
    Post

    Cathodyne Phase Inverter Questions

    Hi Jesco, First let me say that this grid-leak biased phase-inverter design is intriguing… Grid-leak bias is very sensitive and bias varies (A...
    Post by: K Teacher, Aug 11, 2020 in forum: Amp Tech Center
  6. K Teacher
    Post

    Help With SE Distortion

    Hi Andrew, Some years ago I built a guitar amplifier replica and there was something in the sound that was bugging me. I struggled with that amp...
    Post by: K Teacher, Aug 6, 2020 in forum: Shock Brother's DIY Amps
  7. K Teacher
    Post

    Early Gibson GA-9 Voltages Inquiry

    Hi King Fan, Thanks for the close-up pic. It looks like a smooth cone to me...
    Post by: K Teacher, Jun 11, 2020 in forum: Amp Tech Center
  8. K Teacher
    Post

    Early Gibson GA-9 Voltages Inquiry

    BTW, do you happen to remember if the GA-9 field-coil speaker has smooth or ribbed cone? Thanks...
    Post by: K Teacher, Jun 10, 2020 in forum: Amp Tech Center
  9. K Teacher
    Post

    Early Gibson GA-9 Voltages Inquiry

    Hi King Fan, I never had the opportunity to work with a field-coil speaker myself... Regarding the volume pot, it is part of the 6SJ7 load......
    Post by: K Teacher, Jun 10, 2020 in forum: Amp Tech Center
  10. K Teacher
    Post

    Early Gibson GA-9 Voltages Inquiry

    Hi King Fan, Thanks for the detailed information you posted; it helps a lot. I studied the voltage figures you posted... The higher B+ values...
    Post by: K Teacher, Jun 9, 2020 in forum: Amp Tech Center
  11. K Teacher
    Post

    Early Gibson GA-9 Voltages Inquiry

    Hello muscmp, Thanks for your response. The BR-9 circuit is very close to the earlier GA-9 amp… but it does not have the 6V6's cathode and plate...
    Post by: K Teacher, Jun 8, 2020 in forum: Amp Tech Center
  12. K Teacher
    Thread

    Early Gibson GA-9 Voltages Inquiry

    Greetings, I am interested in Single-Ended, paralleled wired tube guitar amps; particularly the early Gibson GA-9 model (circa 1953). I have...
    Thread by: K Teacher, Jun 7, 2020, 9 replies, in forum: Amp Tech Center
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