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Old 26th October 2007, 03:15 AM   #1
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Join Date: Oct 2006
Default too much capacitance in PSU???

I am running an Aikido using four 6SN7s for a total current draw of around 23mA, or around 30mA if I add an extra 30K draw across the final cap of the PSU. Currently, my PSU is:

550VAC
5V4
0.78uF
10H choke
60uF
10H choke
60uF

B+ is around 317VDC at 24mA and I get a little 120Hz hum. PSUDII modelling indicates that I can reduce the ripple to sub mV levels by increasing the first cap to around 1.5uF. I can increase it further by increasing the final cap. I have a couple of options for this:

1. Parallel a 20uF with the final 60uF to give 80uF.
2. Parallel a 45uF with the final 60uF to give 105uF.

OR

1. Parallel a 20uF with the first 60uF to give 80uF.
AND
2. Parallel a 45uF with the second 60uF to give 105uF.

Anyway, is the level of capacitance too much? I expect that the answer is a very clear "No" but I'd like to be sure.

Thanks,

Charlie
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