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6550 tubes

Hello,Out there.Has anyone found decent 6550 tube,I have tried several,Like Gold Lion KT88,Tung-Sol 6550 EH6550 Russian knock off, all of which failed within one month or DOA out of the box.
Fact is the only 6550 I found that did work for more than a month was Valve Art 6550 but has filament noise issues.
Any info would help.
128x128350b
xti16
1,525 posts
 
My personal favorite is the original Tung Sol 6550 black plate followed by the grey plate. Another nice tube that is tough as nails is the Ei KT90 type2. The SED 6550 is a very linear sounding tube and if you like that tube the KT120 may be for you also.
bifwynne
2,206 posts
 
Sorry -- typo corrected in brackets: "Agree 100% with Jea48, especially re Upscale Audio. I've heard that the Russian factory that made Svetlana [6550] Winged "C" tubes burned down, but Upscale Audio] has a supply on hand."
350b's avatar
350b OP
2 posts
 
I really appreciate all of the comments on this thread. Has given me several options for tube selection. As a full time component level audio tech I found a lot of the new tubes like the Gold Lion KT88 Russian knock off to be unreliable, I have these DOA new out the box. I'm going try the Shuggie KT88SC and see how well these work out.
I also design amps and preamps Cunningham Audio. I'm currently working on a new 100 watt version tube amp to be out this spring. Many Thanx To all!! Robert
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