Amp shut down, need advice

Hoping one of our resident amp gurus can help me out; I was playing with some buddies a couple years ago, and was using a friends Kustom Groove 210 combo (600 watts). Amp sounded great, then out of the blue it just shut down. IIRC, you could still hear it, but very quietly. Now fast forward; it's 2 years later and the friend just offered to give me the amp. I went and picked it up last night, but haven't yet had a chance to plug it in and check it out. But I was hoping someone here might have an idea as to what the trouble could be. Once I check it out I will report back here exactly what is (or isn't) doing, but if you have any preliminary suggestions as to what the issue COULD be, I'd love to hear them. Unfortunately, I don't remember what the amp was set at as far as master volumes and such; I just showed up and played thru it, sounded good so I didn't even look at the settings. Sorry guys, I know it's not much info.

 

Thanks B-string, #1 and #2 very clear, but to clarify #3, you mean just run a cable between effects send and effects return? What am I hoping to see/hear when I do this, will it somehow indicate a problem? (Sorry for ignorance; I don't use effects so am clueless about the send and return).

 

Sir, if that's all that's wrong I am going to be one happy camper! I'll try this stuff out (thanks B-string and T-bone) and report back.

 

Ah the Fjords, I believe they are the owners of our fjootball team!

 

Ok, so after watching my Lions do what they do, I hooked up the amp, using my G&L SB-1. Thanks for the link to the manual B-string; I used their recommendations per setting the gain, etc. Manual says to bump the gain until the green light is flashing regularly, which I did. It goes on to say that if the red clip light comes on, you should switch the input from passive bass to active bass. Low and behold it was working great; green light flashing regularly, no red clipping light at all.... as it was later on a Sunday night, I kept it at a medium low volume, and played it for about an hour. Then this morning, after everyone had gone to work, I bumped it up to fairly loud rehearsal volume, using the master, not the gain. Plugged in the G&L SB-1 and hit a couple notes. I noticed that the red clip light flashed very quickly, like a blink, so I changed the input from passive to active, which causes a -12db cut in the signal going into the pre amp. I played for about 3-4 minutes, and the volume dropped quickly and sounded farty while doing so. Now it makes no sound at all. but the green flashing light is still working when I play, just no sound comes out. So, any thought guys? Thanks again for all the help!

 

I will do all tests, was hoping I was ok but clearly not. I'm at work now but as soon as I can I'll post results here.

 

Ok, the amp is still not working, but I did as many of the tests as I could; I can't try another speaker cab because the only speaker output on the head is a speakon, and I don't have any cabs that take those (or speakon cables either). I really think the speakers are ok; it worked the other day when I first plugged it in, so if the speakers were fried when the amp first broke down 2 years ago, they shouldn't have worked at all this time, should they?

I have a Tubeworks combo that works great. I ran the effects send from this amp to effects return on my Tubeworks and it worked fine. When I ran the Tubeworks effects send into effects return on the broken amp, it did not work. So my problem appears to be in the power amp section, not the preamp section, right? Makes sense; preamp lights react as if they are getting the signal. Tried plugging bass directly into effects return on broken amp, no sound. Looping send/return on broken amp, no sound. So guys, what do you think? And what should my next step be?