Smoothing Cap = Noise Source?

blindsjc · 4th October 2007, 07:11 AM

Hi friends,
I'm finishing a pcb for a tube guitar amp
and I used some smoothing caps and power
line which are a little near to gain pots. Are
these smoothing caps a potential source of
noise i this position?

Take a look at the pcb please:
Marked in GREEN - Smoothing Caps
Marked in RED - Gain pots outputs

http://server4.pictiger.com/img/1413...cb-tubeamp.gif

Thanks a lot for any info
Blindsjc

Tom Bavis · 4th October 2007, 12:12 PM

Looks like these are a long way from the rectifiers, so there won't be much noise at all. The first cap after the rectifier is the only one carrying much ripple voltage or current.

blindsjc · 4th October 2007, 04:01 PM

Hi Tom,
You are right, I tried to put the
rectifier at one end and the first two tubes and
tonestack at the other end of the pcb, following
with the power line across the circuit.

Thanks a lot.
Blindsjc

4th October 2007, 07:11 AM	#1
blindsjc diyAudio Member Join Date: Nov 2006	Smoothing Cap = Noise Source? Hi friends, I'm finishing a pcb for a tube guitar amp and I used some smoothing caps and power line which are a little near to gain pots. Are these smoothing caps a potential source of noise i this position? Take a look at the pcb please: Marked in GREEN - Smoothing Caps Marked in RED - Gain pots outputs http://server4.pictiger.com/img/1413...cb-tubeamp.gif Thanks a lot for any info Blindsjc

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4th October 2007, 12:12 PM	#2
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	Looks like these are a long way from the rectifiers, so there won't be much noise at all. The first cap after the rectifier is the only one carrying much ripple voltage or current.

4th October 2007, 04:01 PM	#3
blindsjc diyAudio Member Join Date: Nov 2006	Hi Tom, You are right, I tried to put the rectifier at one end and the first two tubes and tonestack at the other end of the pcb, following with the power line across the circuit. Thanks a lot. Blindsjc