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

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

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.

Cookie

That's another thing it could be, proberly the most likely!

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"