What kind of sound does a noisy 12B4 make ?? - diyAudio
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Old 16th March 2011, 01:33 AM   #1
jj2 is offline jj2  United States
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Default What kind of sound does a noisy 12B4 make ??

I have build a CCS 10m45 12B4 pre amp run at 25ma with 120v , I love the sound but randomly a fire cracker kind of sound comes out from the speaker and it is not the power amp. is that the sound of a noisy tube ?
Thanks for any help.
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Old 16th March 2011, 01:59 AM   #2
rman is offline rman  Canada
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I believe that "noise" is referred to in an electronic component, even resistors, it results in a rushing sound, or "white noise". It is basically a result of electrons randomly banging into each other. I don't know what to make of the firecracker sound, but I would think it must come from either the power supply or the constant current source.

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Old 16th March 2011, 02:00 AM   #3
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Could it be due to oxidised pins on the tube or the tube socket terminals that accept the tube pins ? Spray a contact cleaner on them ( and maybe wipe them also ) and check again. Any cold solders...reflow all solder joints again.
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Old 16th March 2011, 05:41 AM   #4
mikvous is offline mikvous  Greece
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Do you have any grid stoppers there?
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Old 16th March 2011, 06:13 AM   #5
AllenB is offline AllenB  Australia
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Can be carbon composition resistors warming and expanding.
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Old 16th March 2011, 07:33 AM   #6
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On both channels ?
At the same time ?
Faint or as loud as the music you listen to ?
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