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I do self-employed computer service--I did an MSblast repair for a guy last week and noticed a Dynaco Mark III in the corner of his garage office. I told him it was worth something and I'd be willing to barter, and he said take it, I wanna get rid of all that crap. So I took it and gave him $50 service credit anyway. It's got some corrosion on one side of the chassis and cage. The innards and xformers are are clean. It's got the original Dynaco-labelled 6550 amp tubes, but one is toast. The other tests very strong on my Precision 660, though I can't grade it.Mark III's are bringing good prices on Ebay, and I'd like to mint it out and sell it to finance other unfinished projects. Does anyone have some advice on tube replacement? Should I search out a single used Dynaco-branded 6550 or buy a pair of new EH tubes (I think JJTesla makes them too)? Where can I get the best deal on a matched pair of 6550's?
Follow Ups:
There are still plenty of 6550 RCA NOS around.
TungSol.NOS TungSols from the 1960's or 1970's will run you about 100 bucks apiece now, and in a great amp they can be worth it. If you ever rewire and upgrade that Mk III, you might want to try them. Until then, all the other suggestions are good.
Svetlana 6550Cs are pretty popular. Don't know the EH version first-hand. The Svetlanas can be had a Conus Audio in Canada for $80/quad, which is significantly less than I've seen elsewhere. Got new ones just a few weeks ago.
EBerlin
These guys are pretty good
Nice score! Always good to get stuff like that...Try the Sovtek 6550, cheap and apparently fairly rugged...
You mihgt also want to find out why the original tube failed! Probably running too hot? Did it kill the OPT?
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