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In Reply to: RE: RF in my tube headphone amp posted by Tweaker456 on February 08, 2016 at 01:52:33
What is the symptom?
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Buy Chinese. Bury freedom.
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Well TK, It just might not be RFI. There is static and sometimes a even tick tick tick tick. like maybe 2 per sec., then there maybe a very fast 4 ticks in a row. Comes and goes. Much worse on one tube I put in, as I said before. Maybe it not being rfi makes more sense since I dropped it. You seemed to imply some doubt about it being RF. Does not get louder when the pot is turned up. I'm in the SF bay area , south of the city. Thanks, Tweaker
Try putting your cellphone on airplane mode.
"There is static and sometimes a even tick tick tick tick. like maybe 2 per sec., then there maybe a very fast 4 ticks in a row. Comes and goes. Much worse on one tube I put in,"
You're right, that doesn't sound like RFI. If you've looked at the circuitry and don't see anything shorting, it might be time to retube.
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Buy Chinese. Bury freedom.
Two sets of tubes have the same problem. The new old tube was way worse so I don't see it as a tube issue unless I'm missing something. T
Did any of the tubes get angled in a socket when the amplifier fell? That can loosen the pins. Check to be sure they're all tight, and I think you should probably also clean the sockets as Dave suggested above.
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Buy Chinese. Bury freedom.
There is a staticy crackeling , much worse on the left channel and I also hear if I remember correctly morse code. Something transmitted and repetitive. I bought some new used tubes to try and one had a pretty high level of hiss and the static was way worse on that tube. I believe that tube is bad, way too noisy. It exaggerated the problem. Happens with two different sets of tubes. I did what I could to make sure the tubes were in place with good contact. I'm pretty sure the crackeling is from a distorted signal. Tweaker
If you're hearing Morse, the prognosis isn't good. That would mean a ham radio operator is close enough for his transmitted RF to affect your system. It can be very difficult to prevent this type of interference in high impedance tube circuits built for audio use, especially those in wood chassis with virtually no shielding. Some of the possible solutions include RF filtering at the headphone jack(s), filtering at the mains, and if you have a turntable, RF filtering of the phono leads. Speaker leads attached to any part of the system should also be filtered where they connect to the amplifier.
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Buy Chinese. Bury freedom.
Edits: 02/08/16
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