SkyDawg
First Lieutenant   Posts: 1 Registered: 12/27/2005 Status: Offline
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posted on 12/27/2005 at 14:02 |
Ive Been having trouble with my super reverb , its been making a crackling
, almost like the sound of " leafs russling" in my speakers, its even
happens when nothing is plugged in my amp. I Took it back where I bought it
and offcourse it wouldn't do it for them but has soon has i got it home it
started back up, I though it mite be poor power so I bought a furman power
factor, the hiss went away but the crackling is still there,...
any advise
thanks
nat
richmond va
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brian
Moderator   Posts: 1075 Registered: 12/22/2003 Status: Offline |
posted on 12/28/2005 at 10:45, Reply 1 |
Sounds like you have bad tubes.... Their Microphonic.. Tap on the top of
the amp and listen for a microphonic sound. I also use a pencil and tap
lightly on the tubes.
It could be many things
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Cookie
First Lieutenant Posts: 1 Registered: 1/24/2006 Status: Offline |
posted on 1/27/2006 at 13:20, Reply 2 |
When a tube amp gets crackley the cause is usually filter caps that are
totally shot. The expected life of a filter cap when Silverface Fender
amps were built was 10-15 years. Most of the BF and SF amps that I service
still have the original filter caps in them putting these caps in the 30+
year old bracket. The function of the filter caps is to remove the ripples
and pops in DC voltage, the results of which you are hearing now. A tech
can clear this up for you easily.
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brian
Moderator Posts: 1075 Registered: 12/22/2003 Status: Offline |
posted on 1/31/2006 at 11:26, Reply 3 |
That's another thing it could be, proberly the most likely!
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kc5jk
First Lieutenant Posts: 6 Registered: 8/31/2007 Status: Offline |
posted on 9/2/2007 at 10:05, Reply 4 |
Dried-out power supply filter capacitors will cause steady hum, not
crackling noises. The noises you describe are usually generated in early
tube stages. Those are the small tubes, typically 12AX7 or 7025 types.
The power amplifier tubes, typically 6L6, 5881 or 6550 types, can generate
such noises too, however.
Where you have more than one of the small tubes of the same type, try
swapping them around among stages. Moving a noisy tube to a less critical
stage may get you by.
Paul www.KC5JK.com "New Twang Page"
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