Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Bought this used, sounds great until signal decay/ Basically, what happens is after the first (heavy or clean) attack is good, but as soon as the decay begins, it seems to fall of IMMEDIATELY to zero, rather than "Cruising down."

I used the headphone jack so I could test to see if it was speaker -- same issue. Any ideas/suggestions, folks?

PS: If there is a more specific area I could have posted this, feel free to let me know and I will move it to its rightful area...

Probably the headphone out is simply the speaker out, padded down, so you are excluding the speaker "mechanically" but not the output (¿single chip? power amp.
If your amp has line out/in jacks, send the out signal to another known good amp, and check if the problem is still there (guess not).
Also inject some clean signal (¿CD/MP3?) into the line in, to check that what you hear through the speaker still squelches or not.