bias cap

[C Moore]

Amps with tube rectifiers need a smaller cap after the rectifier than solid state rectifiers where it doesn't make a difference.

I am not sure I follow what you are saying.
This is before the Tube Rectifier, and it is a SS Rectifier.
But I might be misunderstanding your advice.
I am looking at this schem.....
thanks

Sorry it was late and i missed the word 'bias' duh!!!!!!!

No worries.
I am an idiot for not seeing the misunderstanding. I was too fixated on MY question.

[martin manning]

You are saying it is actually Seconds...not micro seconds.? I would not have thought there was that much difference between 25 and 100. I am not arguing...just stating my ignorance/surprise.

And.....are you saying that (even if there is no SB Switch) by the time the cathodes are fully conducting, the neg bias has stabilized....or are you saying the opposite.?
Sorry
Thank You

With two RC filters the difference in stabilization time between 25u and 100u can be several seconds. With a single RC like Fender used, and a 470 ohm input resistor, the difference is only about one second.

Re the second question, I'm saying the time for the bias supply to stabilize is within the shadow of the cathodes coming up to temperature, as long as you don't have crazy large filters in the bias supply, or a large resistance at the input like you might have if the bias supply is taken from the HT.

[C Moore]

Got it ... x2
10-4
Thank You