a little intermittent thump...

jlg4104 · 8th October 2003, 01:27 AM

I've got a Scott 209 integrated amp. It's stock, as far as I can tell, except for the NOS tubes I put in, all of which should be fine. It sounds sweet-- quiet, euphonious, not the greatest high end, but hey, whaddya expect from a 45-year old stock amp!

The problem is minor but noticeable-- every 30 seconds or so it emits a subtle thump of a mid-bass pitch-- kind of like a very quiet bass drum being hit with a fuzzy mallet. It's quieter, it seems, than any of the volume peaks in the music, but quite easy to hear.

Any idea what could be going on? As I said, the parts are stock, so any number of elements could be degraded by now. I've had dreams of getting a second one of these and doing a thorough parts-replacement, at least of the caps, wires, other potentially cruddy stuff, etc.

Thanks!

Jay

fdegrove · 8th October 2003, 08:33 PM

Hi,

Sounds like a PS capacitor dieing to me.

Cheers,

dhaen · 8th October 2003, 11:57 PM

Hi,

Another possibility is discharge through dust. You might try cleaning using a paint-brush and vacuum cleaner.

Cheers,

8th October 2003, 01:27 AM	#1
jlg4104 diyAudio Member Join Date: Oct 2002 Location: Youngsotwn, OH	a little intermittent thump... I've got a Scott 209 integrated amp. It's stock, as far as I can tell, except for the NOS tubes I put in, all of which should be fine. It sounds sweet-- quiet, euphonious, not the greatest high end, but hey, whaddya expect from a 45-year old stock amp! The problem is minor but noticeable-- every 30 seconds or so it emits a subtle thump of a mid-bass pitch-- kind of like a very quiet bass drum being hit with a fuzzy mallet. It's quieter, it seems, than any of the volume peaks in the music, but quite easy to hear. Any idea what could be going on? As I said, the parts are stock, so any number of elements could be degraded by now. I've had dreams of getting a second one of these and doing a thorough parts-replacement, at least of the caps, wires, other potentially cruddy stuff, etc. Thanks! Jay

8th October 2003, 08:33 PM	#2
fdegrove diyAudio Senior Member Join Date: Aug 2002 Location: Belgium	Hi, Sounds like a PS capacitor dieing to me. Cheers, __________________ Frank

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8th October 2003, 11:57 PM	#3
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Hi, Another possibility is discharge through dust. You might try cleaning using a paint-brush and vacuum cleaner. Cheers,

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