7591 questions

[kvflyer]

Because they were cheapskate pinheads! :yes:

Anyway, lifting the grounds on the 7591's by throwing in 10 ohm 1/4W resistors is a great idea; and 10 makes it easy to do the math. THEN. . . . maybe a couple of bias voltage adjust pots, and even test jacks above the chassis is an INCREDIBLE idea. This gives you complete control over all four 7591 tubes. No need to worry about matched sets ever again! I don't.

. . Falcon

Amen brother...

 

[Patrice B]

Because they were cheapskate pinheads! :yes:

Anyway, lifting the grounds on the 7591's by throwing in 10 ohm 1/4W resistors is a great idea; and 10 makes it easy to do the math. THEN. . . . maybe a couple of bias voltage adjust pots, and even test jacks above the chassis is an INCREDIBLE idea. This gives you complete control over all four 7591 tubes. No need to worry about matched sets ever again! I don't.

. . Falcon

Looking at your reply, I remembered you made a simple circuit to properly bias your LK-72A for each side independantly. Do you have a schematic somewhere (or a step by step procedure)?

I would like to do the same for mine (only one bias adj. pot for now) in the near future.

Thanks.

Patrice