Amp Q

VENTGtr · Post by **VENTGtr** » Thursday Dec 06, 2007

Sold my H&K on EBay. Just before I packed it up I played through it and it
worked fine.

The guy (In FL) received e-mailed that the "pilot" light comes on but none of
the channel lights (With or without the FS) light up, the pre tube doesn't light
up (He's tried a different one) and there's no sound.

He's swapped out all the fuses and seems to know what he's doing.

I told him I'd refund his money and all but he'd like to keep the amp.

Any thoughts would be appreciated.

orangekick · Post by **orangekick** » Thursday Dec 06, 2007

Some of the lower H&K amps seemed to have issues with bad solder joints. If this dude has half a clue, he could crack open the amp and check. A buddy of mine had a H&K Attax 80 combo that had a few issues with that.

Post by **Ron** » Thursday Dec 06, 2007

Orangkick's reply makes sense. Cold solder joints on tube amps with point-to-point wiring can come loose during shipping. I've seen it happen before.

skipisode · Post by **skipisode** » Friday Dec 07, 2007

Ron's right on this.I just bought a new tube amp recently, and this happened.A little checking and touch soldering took care of problem.

lonewolf · Post by **lonewolf** » Friday Dec 07, 2007

In a similar situation, the buyer and I agreed for him to get a repair quote and I refunded that amount back to him.

You may also want to see if you can file for a shipping insurance claim. UPS automatically insures for up to $100. That will take awhile, but you may be able to reclaim the repair costs.

VENTGtr · Post by **VENTGtr** » Friday Dec 07, 2007

Cool guys. Sounds like th best possibility (Unless he really didn't understand
the part about making sure the Master Volume was up). Thanks for the input.

VENTGtr · Post by **VENTGtr** » Friday Dec 07, 2007

Actually, since i have this question, here's another. Someone told me their amp will be
working fine then the sound will sort of fade away, then come back, fade away, etc.

Normally it takes a while of being on to start doin' it. I haven't heard it but have heard of
the problem before.

Any idea what would cause this?

Thanks much.

Post by **Ron** » Tuesday Dec 11, 2007

My guess would be a bad tube or tube socket if it's a tube amp.
If it's solid state, then there's probably a bad transistor somewhere.

Usually problems like that are caused by thermal cycling. The bad component is OK until it heats up. It then breaks once it is hot, cools down, starts to work again, and the cycle repeats.

If there are any thermal circuit breakers or thermal speaker protection on the amp, that could also be the problem.

VENTGtr · Post by **VENTGtr** » Tuesday Dec 11, 2007

Ron,

Cool. Thanks a lot for the input.