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Old 3rd December 2012, 07:31 PM   #11
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I had exactly the same problem on my last project, using a similar Hammond PT, with diode rectifier. I tried all sorts of capacitor/resistor suggestions, different diodes, etc, to try to kill the noise. Couldn't get rid of the noise. I clearly identified the source of the noise as the filament supply (receiving noise from the B+ winding) coupling noise into the grids.

My solution was to use a small filament transformer to supply my preamp tubes. Using the noisy filament supply on the push-pull power adds no noise.
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Old 6th December 2012, 12:44 AM   #12
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Better, but still not perfect:
Click the image to open in full size.
Not dead quiet yet, but the original problem is gone. Need to double check all my joints and see about a little shielding on the the power supply side.
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Old 6th December 2012, 01:09 AM   #13
JMFahey is offline JMFahey  Argentina
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Hey !! That looks GOOD !!
Congratulations.
Now you have a real chassis which ypu cam later bolt into a head or combo cabinet.
Yes, you will still have a little noise, everybody does by the way, but now you are fighting dogs, not Godzilla.
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Old 9th December 2012, 10:27 PM   #14
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Perfect now:
Click the image to open in full size.
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Old 9th December 2012, 11:01 PM   #15
JMFahey is offline JMFahey  Argentina
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Wow !! Now that's something !!!
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