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RE: update 3

On the ripple, I get 3.5mv AC peak to peak. 3.5 / 2 = 1.75 mv peak X .707 = 1.237mvac rms.

I have questions.

1. Where did you get a 10Hy choke with 30 ohms DCR?

2. The sim shows an output voltage of 285vdc into a load resistance of 5k ohms. That would be 57ma of current. Does your preamp circuit draw 57ma. of current?

3. Is there a volume control before the preamp tube(s) and was it turned all the way down when you made your measurement?

BTW The ripple on the audio output of the preamp will not be at the same level as the ripple coming out of the power supply.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"


Edits: 09/13/16 09/13/16 09/13/16 09/13/16
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