2. amps-preamps
  3. 156549-2236

HELP! - Need a Repair Recommendation for my Raysonic Amp

After 5 years of flawless service, my Raysonic SP-66 tube integrated wouldn’t power up yesterday evening. The fuse at the electrical input was blown, but it still didn’t power up even after I replaced the fuse with one that tests good. I took the bottom plate off, looked around inside, and didn’t see anything obviously wrong. The 2 internal fuses tested good.

It ocurred to me that the power button was probably in the ON position when I went to start listening. This suggests that either I accidentally left it on the last time I listened, or one of my grand-children turned it on, and it over-heated. I also noticed a paint blister on one of the transformer covers suggesting that it over-heated.

My suspicion is the power transformer, but I don’t how to confirm it, or replace it if it is in fact the problem.

Raysonic is long gone and they had a reputation for being secretive with product details, so I doubt that anyone will have schematics or parts values.

The amp has been a pleasure and it is a perfect match for my CD128 CD player which has also performed flawlessly.

Therefore, I would very much like to get the amp repaired, as long as it isn’t cost-prohibitive, but I don’t know who to turn to, much less trust, to do the work.

I would hope that a well-qualified tube amp technician would be able to fix this even if they are not specifically familiar with Raysonic. I just don’t know who that is.

So, I would appreciate suggestions/recommendations of someone who may be able to help me out.

Thanks in advance.

Brady




bbroussard

Showing 1 response by oldhvymec

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oldhvymec
5,101 posts
 

The blister on the transformer cover, is something to be concerned about. The "why" more than anything..That's hot!!

Pulling the top on the transformer and doing a "look see", if you can. If it's burnt, it's burnt.. The ol sniff test goes a long way, too, does it smell burnt?
   
Did you pull the valves and see if it will stop blowing fuses.  If it turns on, look to the valves. Is there a chance one blew and that caused a fuse to blow.  Happened to me more than once.
I've lost valves that caused a resistor or two to fail, and the other way around, lost resistors that blew a valves..

If it won't power up, MAKE SURE the fuse is good, (could have blown) pull all the valves and check again, if not, look for a second fuse inside. Then make sure the on/off button didn't go bad.

One visual, the transformer. The on/off, a DMM. Unless you lost a valve it's shop time.. You don't need a schematic, but it can sure help in some cases. Probably no schematics because it was scribbled on a paper bag.. Their not that complicated of a circuit.. No matter who made the amp..The reason there is no information is because there never was, very common in the valve preamp/amp world..

Regard


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