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In Reply to: RE: Dynaco SCA-35 question posted by gkargreen on December 26, 2016 at 18:13:47
Original Dyna boards are known to delaminate quite easily when being soldered/desoldered. The substrate is unstable and the traces are substandard. Why not just buy one of the many sets of replacement boards. They are very cheap in relation to this type of project.
There is also a Dynaco forum on the Asylum that can be accessed from the drop down box on the top of the screen.
Best of luck with your project.
Follow Ups:
Good question. I was looking into those replacement boards, but the boards on this Dynaco are thick, heavy-duty and the traces are just fine as I have already stripped one of them and started to replace the parts back on, no delamination of the traces are occurring. I do have prograde solder equipment, both Hakko solder & desoldering equipment as well as a lot of experience, so that helps.
When I worked on my Mark IV's, there were no boards available. I had to jump one trace with a wire. On my SCA-35 I think it is a newer version. The boards are not that bad. (YMMV!) I am a very gentle solderer. I have not rebuilt the SCA-35. My plan is to start with the original board, and if disaster happens, buy a new one.
Dave
Agreed, Dave, each repair should be treated on its own merits, if those boards are/were bad, I would replace them with the many available, pre-stuffed boards on ebay, however, these are fine, have been stripped of the old parts and new, higher-quality parts are being sourced and installed, including new Beltron micalex sockets for the output tubes. Those sockets were obviously in bad shape, however, the board mounted sockets (7199 & 12AX7 on phono board) where just as obviously in great shape and retained. Having done numerous restorations and having excellent Hakko solder/desolder gear, I am confident that these will be better than ever with quality parts and construction.
by that logic if you checked a cap with a cap checker and it still met spec would you leave it?
The problem is often not today but, with 40-50 year old parts it can often be the near future IMHO. Take my advice for what it's worth, just what you paid for it! And have a happy New Year.
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