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Post by iggs on Jan 14, 2007 9:20:13 GMT -7
Just found this on the 'net searching for some NOS KT66: www.tubeworld.com/kt66.htmDid anyone ever buy anything from these guys? Any info? Are they a trusted and reputable NOS source? Right now the only person I would trust enough to drop $395 on a pair of NOS KT66 is Mike at KCA ...
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SG123
Full Member
Posts: 221
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Post by SG123 on Jan 14, 2007 19:02:24 GMT -7
I've purchased used old stock tubes from Brendan - real TungSol 5881 as I recall - and they were exactly as advertised, packed well and shipped quickly.
His credibility has dropped a bit with me after he started offering cryogenically treated tubes at exorbitant prices. Snake oil, IMO... That aside, he's had some neat stuff over the years and I wouldn't hesitate to buy from him again.
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Post by myles on Jan 25, 2007 12:06:42 GMT -7
I have dealt with them and they are fine. Their prices are a bit high at time from what I see from other folks at times.
To SG123 - .... Those Cryo tubes ..... I have found no benefit, they seem to not test any better or worse than other tubes, on life tests in constant duty they do not exhibit longer tube life but in on/off power testing where the tube warms up and then cools off so there is expansion and contraction they appear to go physically microphonic more quickly and easily.
This may be due to work hardening of the materials such the the micas faster, or them becomming brittle due to the cold processing just as in metal.
But let me say that I have not had a lot of these to test and my experience was based on one duet and two quads from three amps owned by two people. So ... this may not be a good sample to say the least data wise.
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SG123
Full Member
Posts: 221
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Post by SG123 on Jan 25, 2007 17:03:26 GMT -7
"So ... this may not be a good sample to say the least data wise."
But it's a good start ! Not sure if it was something you mentioned before someplace, but I do remember reading somewhere that the cryo-treated tubes had a tendency to go microphonic prematurely - or that the physics of cooling the materials in that manner might lead to that result.
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Post by myles on Feb 23, 2007 15:41:36 GMT -7
"So ... this may not be a good sample to say the least data wise." But it's a good start ! Not sure if it was something you mentioned before someplace, but I do remember reading somewhere that the cryo-treated tubes had a tendency to go microphonic prematurely - or that the physics of cooling the materials in that manner might lead to that result. I have had no good luck with any cryro tubes and have made many attempts to look for something that would set them apart from non treated tubes. But ... that is just my experience.
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