What kind of sound does a noisy 12B4 make ??

jj2 · 16th March 2011, 01:33 AM

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.

rman · 16th March 2011, 01:59 AM

Hi.

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.

Cheers.

ashok · 16th March 2011, 02:00 AM

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.

mikvous · 16th March 2011, 05:41 AM

Do you have any grid stoppers there?

AllenB · 16th March 2011, 06:13 AM

Can be carbon composition resistors warming and expanding.

ashok · 16th March 2011, 07:33 AM

On both channels ?
At the same time ?
Faint or as loud as the music you listen to ?

16th March 2011, 01:33 AM	#1
jj2 diyAudio Member Join Date: Apr 2003 Location: ny	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.

16th March 2011, 02:00 AM	#3
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	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. __________________ AM

16th March 2011, 07:33 AM	#6
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	On both channels ? At the same time ? Faint or as loud as the music you listen to ? __________________ AM

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16th March 2011, 01:59 AM	#2
rman diyAudio Member Join Date: Oct 2007	Hi. 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. Cheers.

16th March 2011, 05:41 AM	#4
mikvous diyAudio Member Join Date: Nov 2006	Do you have any grid stoppers there?

16th March 2011, 06:13 AM	#5
AllenB diyAudio Member Join Date: Oct 2008	Can be carbon composition resistors warming and expanding.

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