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#1
06-17-2016, 07:46 PM
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RCA 1YB-11 rumbling sound
Making major strides on my tape cartridge recorder tonight. I have it playing again! Audio comes through fine, and the mechanism seems to do everything it should at the right speed.
However, I'm getting a rumbling nose through the speaker. It comes and goes, but seems to reliably come through as it warms up, then gradually comes through less and less as it's on for awhile. This doesn't affect the audio quality, which seems to drown it out when playing. Youtube link because I don't think I can upload videos here: https://youtu.be/WcWWbE7dVQI Also, in the future, should I just make one overall thread for a single project? I know I've been periodically making new threads for individual questions, but it seems like maybe that's not the best option. Sorry if I've been flooding the forum.
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To keep your tubes running smoothly, make sure to dust underneath the glass as well. 
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#2
06-17-2016, 08:07 PM
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It seems like when I tape the 6EU7 tube, it gets better. Not consistently, but I notice a change fairly reliably. Could it possibly be a vibration within the tube?
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To keep your tubes running smoothly, make sure to dust underneath the glass as well.
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#3
06-18-2016, 11:58 AM
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One thread collects info on the project better.
What you may have is a microphonic tube. Any vibration from the motor, the mech, flicking the tube etc. is being converted in to a signal voltage by the tube and passed on to the other amp tubes.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
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#4
06-18-2016, 12:07 PM
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Quote:
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To keep your tubes running smoothly, make sure to dust underneath the glass as well.
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#5
06-18-2016, 12:23 PM
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With it acting up give each tube a hard tap with a metal screwdriver, keeping your ear close to the speaker. You should hear a 'pluunk' sound in the speaker.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
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#6
06-20-2016, 12:28 PM
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Quote:
__________________
To keep your tubes running smoothly, make sure to dust underneath the glass as well.
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#7
06-20-2016, 01:01 PM
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The louder the plunk the worse the microphonics are. If you got a spare 6EU7 you may want to swap it in.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
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Linear Mode
