Posted by Tnuctipun [ 64.12.116.14 ] on February 11, 2005 at 11:39:50:

Hey-Hey!!!,
I found a few causes of noise. part was a routing. I ran the choke leads too close to the voltage refrence boards. I moved this and a lot of it went away. the other was harder to figure. I changed the orientation/location of some of the bits on the voltage ref. boards. They were picking up interferance and pluging it in where the circuit was quite sensitive.

I think the last can be adressed with a seperate filament TX. I have two 6.3 and a 5VAC winding in series feeding a bridge and I *SUSPECT* that if it were on a different core I would be free of its infulence.

Also, the active load/output buffer works best with a 12GN7 and a 12BY7 instead of two of each. Now to re-wire and plug in the 7788's I have in place of the 12GN7's. 50 mA/V gm ought to help...instead of 36 mA/V. If I can avoid creating an RF oscillator.
regards,
Douglas

Replies:

• Re: Rev. 6 update - manualblock 12:40:28 02/11/05 (9)
  • Sauce... - Tnuctipun 15:47:17 02/11/05 (1)
    • Re: Sauce... - manualblock 16:17:45 02/11/05 (0)
  • 7788 - Tnuctipun 13:21:36 02/11/05 (6)
    • Re: 7788 - manualblock 14:21:02 02/11/05 (5)
      • Re: 7788 - Damir 15:06:58 02/11/05 (4)
        • Insanity... - Tnuctipun 15:22:24 02/11/05 (3)
          • Re: Insanity... - colinhester 15:39:01 02/11/05 (0)
          • Re: Insanity... - Forty2wo 15:24:14 02/11/05 (1)
            • that's not so good... - Tnuctipun 15:40:21 02/11/05 (0)