Amp Internals 2

jbl_man wrote: Yup, ditto, would run a mile from that nonsense. I bet even the manufacturers don't repair them, will just swap out for new modules, at silly cost. Pass.

Yes, that's the norm. Depends on how bad they are. If there were burned out tracks, or similar, I would not have touched them.

These weren't too badly damaged - just some odd damage - a few blown O/P MOSFETS, some diodes gone and one had a bad LM317. Quite a mixture. I've managed to get a couple going already, so let's see. Otherwise it is just new modules & hope for the best!  

Yes, I agree. I would never touch anything like that for my own system - but I still need to pay the rent! You can't always turn down the work. And he needs them for a New Years Eve party, so willing to pay to get them going. I did suggest just making the cabs passive & buying some decent amps, but he just laughed.  

 

I've been fighting with these for the last few days:--

Owner thinks that it may have been a voltage spike on the mains that took them out, but the varistors/fuses were all ok, so I somehow doubt that. Most probably just coming to the end of their useful lives!   

I've had an odd week, with 2 old Crests coming in for repair. 

An 8001, which just has a dodgy input select switch - no big problem - and this old beauty:-

I was at first a bit worried at seeing that it had been modified:-

But the problem turned out to be quite simple - just a dodgy multipin cable. All good now & ready for another 30 or so years of service!  

I do like the lump of transformer it has. Good for life!