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In Reply to: RE: NYAL OTL3 posted by rhinohifi714 on March 25, 2014 at 16:00:41
Sure. Here it is.
This is one of the first OTL3 per George Kaye. Very late 70's or very early '80's - he wasn't certain exactly when. He mentioned some of the original caps in the power supply were WWII surplus. It has some odd bits on the front and back of the board. There are also upgraded DynamiCaps in the signal path (completed by GK). The version in your picture looks much more well finished. Mine looks more like a prototype. Sounds amazing.
Follow Ups:
Thanks for the pic, that is different in several ways.
Glad you got it up and going.
Enjoy !!!
Is it finally working?
this is in some ways a scary thread. My OTL3's are still working well, no red glow, running cool, and sounding fantastic. But maybe this explains why one of them caught fire years back; perhaps one tube entered thermal runaway and melted the top cap, and things went bad from there. I suppose someday i will have problems again with the tubes. I've got a fair stock of spares, but who knows if they will end up being good or if I will be able to find someone to do the necessary adjustments?
Spent a couple of evenings just listening in amazement to a wide variety of music.....tonight the original LP pressing of Patricia Barber's Modern Cool. With my Stax speakers, the NYAL OTL's,
the Klyne SK5, and a van den Hul Frog, the tangible presence of her voice and band, and the beauty of the harmonic structure, was breathtaking.
By the way she has a new single release available on iTunes, a solo cover of "River" by Joni Mitchell, that is just lovely. (For her fans, I guess, if there are any here.)
Yes, fixed faulty 6LF6 fuses, setup done and they're working great. They look like thrown-away prototypes, but I still can't believe the sound they produce. Just incredible.
I found this event a bit scary myself. Glad I caught it before it became a "serious" failure. Thought I checked the fuses, but clearly hadn't. Yet another good example for needing a detailed checklist to ensure the work is completed correctly.
Would really like to hear the Stax. Have heard really great feedback on those speakers, but like the OTL's they're not that common. Sounds like you have a great setup. If you like "Modern Cool", check out "This is Chris" by Chris Conner (on CD as Japanese import BCP-20).
I also bought four 6LU8's to replace the old ones I have from Brent Jesse, given "rhinohifi714" comments. I'll put them in when I check the amps again in ~10-20hrs of use (I always double check). I'm giving up buying random tubes. Better to pay and get what works rather than collecting a lot of not-quite-100% "spares".
to unlisted (and also anyone else interested, esp rhino and Lew),
Of course you are more than welcome to listen here any time you are nearby. Where do you live?
At some point I might even be able/willing/driven to subsidize a visit by a technical expert to help check things out.
I do have a local friend who has a somewhat similar setup: Soundlabs, VTL and also Atmasphere amps; we've only been able to find snatches of time to listen together. He is much more savvy about electronics than I, but like me is a university professor and hence has a negative amount of free time, so I'd be very reluctant to ask him to help me out.
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