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I overheated the board (Shannon Parks ST35 circa 2002) while removing bad caps and a couple of traces lifted off. I consulted Professor Google and found recommendations for conductive ink pens and copper tape, but I figure somebody here will have figured out what works. They're not in a good spot to install a jumper, but I could try that too.
Larry Fisher
Port Townsend, Washington
Follow Ups:
Post a photo of the damage. This is not likely a big deal.
I sold the amp to another inmate and he has generously offered to sell it back to me if/when he gets it working again. I did get 20 good years of trouble-free use from it.
Larry Fisher
Port Townsend, Washington
I have soldered in a bit of solder wick. Not ideal...but still functional after nearly a quarter of a century... :)
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
As mentioned by a few others, I would just install some jumpers from on side of the lifted trace to the next component on that trace.
Since you did swap out some parts yourself, you proven that you have a soldering iron and have done some soldering before.
Take your time and don't overheat the components.
Without photos it is difficult to advise, but in general it should be easy to repair. First I would cut off any tracks that are hanging off the board. Determine which components the track connected and replace the track with a piece of 22 gauge wire. For instance if the track goes between one leg of the capacitor to a resistor or tube pin, simply loop the wire around the capacitor lead and solder; then loop around the resistor and solder. Whether you leave the insulation on the piece of wire or not depends on the application.
And if the wire is PVC insulated, it can be secured to the board with super glue.
Nt
How did you determine that the original poster gave up?
I did read his "make me an offer" reply to you. If it was me, and I wasn't able repair it, I'd remove the circuit board and send it to one of the more proficient posters on the DIY Tube Asylum for repair.
Just kidding, not really a member of the Psychic Friends Network, the OP placed ads in the Asylum Trader and on DIY Audio.
Edits: 07/12/22
I've met a few from the Psycho Friends Network, but enough about my love life.
Nt
I'm afraid so.
Larry Fisher
Port Townsend, Washington
Mf
It is a really nice amp. Make me an offer!
Larry Fisher
Port Townsend, Washington
I looked at the big auction site as a result of your last post. Wow, asking prices for those have gone insane! If I had one that needed boards, I would cut two .060" aluminum plates the right size, install chassis-mount sockets and wire it point to point. OTOH, I wouldn't want to have to do that after spending $1,000 for one. Yikes!
Beyond my skills level. Honestly I build these things like kids do paint by the numbers.
Larry Fisher
Port Townsend, Washington
Would you be able to remove the boards and send them to someone? That would certainly be less expensive than shipping the entire amplifier. Is it out of the question to buy new boards?
Can you recommend someone to reach out to for repairing the board? I'd certainly be open to that.
Larry Fisher
Port Townsend, Washington
I would offer to help, but I'm up to my ears with a SET project at the moment. It might help to know the skill level involved. Can you post a couple pics of the damage?
Just sold it to viridian, further up the thread. But thanks again for your input.
Larry Fisher
Port Townsend, Washington
OK, good deal. Sounds like it's going to a good home.
I tried the board being sold on eBay and it has completely different dimensions than Shannon's boards, so it wouldn't work. There is a guy on diyaudio offering a board that seems the right size and I'm looking into that. I do have a bit of attachment to this amp, having built it 20 years ago and used it ever since. It does sound really good, even on my Quad electrostatics which are notoriously revealing.
Larry Fisher
Port Townsend, Washington
That was my suggestion too, TK. That is, unless the amp really doesn't suit the original poster's needs.
...but below is a link to some youtube videos on the subject, which perhaps may give you some useful suggestions.
I've used jumpers in the past, as I was never trusting of the conductive pens, etc.
Good luck with it.
Thanks. The one with the British guy is quite good, though my skills are not quite on his level!
Larry Fisher
Port Townsend, Washington
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