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Old Today, 03:28 AM   #271
TheGimp is offline TheGimp  United States
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George, if I want to run GNFB from the output of the OPT do I go to pin 7 of V1B and swap DRV2=2 and DRV 1-1 as necessary to get phasing correct?


Any recommended change to C1 if I do? Looks like it may affect LF response.

I'm about ready to start torturing some tubes. 6P3S is first up, to be followed by 6P41S.
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Last edited by TheGimp; Today at 03:31 AM.
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Old Today, 03:41 AM   #272
dch53 is offline dch53  Australia
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Originally Posted by TheGimp View Post
George, if I want to run GNFB from the output of the OPT do I go to pin 7 of V1B and swap DRV2=2 and DRV 1-1 as necessary to get phasing correct?
For global negative feedback George recommended adding a 100Ω resistor between the 0.47uF capacitor and ground and running the negative feedback via a 5k resistor to the junction of the capacitor and resistor.

In my simulations I've run a 2.5K feedback resistor without a problem. Gave me about 10dB of feedback I think.

Last edited by dch53; Today at 03:41 AM. Reason: Fix typo
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