MagneQuest/Peerless Forum

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Re: My parafeed 300B prototype and questions

Posted by Paul Joppa on May 19, 2004 at 23:01:36:
Huh - I though I had posted, but it's not there now. Maybe I punched the wrong button.
Your hum is not from the power supply, which if built as shown should have about 1mV ripple. The 300B cathode hum vltage is 0.1 times the plate voltage, but mu is less than 4, so there must be a lot of hum at the grid also. Perhaps your plate chokes are too close to the power transformer? Hard to say; hum-busting is a pretty long and frustrating experience unless you get lucky. I wish you good luck!
C3 of 4uF works well with TFA-2004. Can't say about the others, maybe someone who has worked with that topology can comment?