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MagneQuest/Peerless Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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MagneQuest/Peerless Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: My parafeed 300B prototype and questions posted by Tanker on May 17, 2004 at 21:05:30:
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?
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Follow Ups
- Re: My parafeed 300B prototype and questions - Paul Joppa 23:01:36 05/19/04 (4)
- What Type of Cap for Parafeed? - MikeT 06:25:40 05/23/04 (2)
- Re: What Type of Cap for Parafeed? - Paul Joppa 11:51:24 05/23/04 (1)
- Thanks For The Info (nt) - MikeT 07:55:48 05/24/04 (0)
- Paul! is the 1mV ripple mentioned regarding to at the 300B plate or - Tanker 05:12:14 05/20/04 (0)
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