Re: Thanks Bill

Posted by Legendre (A) on October 19, 2006 at 16:34:29

In Reply to: Thanks Bill posted by Coffeecupman on October 18, 2006 at 23:47:34:

CCM,

I made a typo in my previous post - the suffixes are in alphabetical order, in terms of supposed increasing quality; -J, -Q, -T. The information about the higher-spec suffixes came to me just yesterday, from a 3rd party. This is why I use the term 'lore'; verification is required before acting on this info.

Also, keep in mind that while the military optimized tubes for various reasons, sonics was not among them. If you're going to pay more for a higher spec, make sure that it's actually ruggedness or service life you are getting, and not tightly controlled heater current, operation at 30,000 feet, extended temperature range, or some other essentially pointless optimization.

The production dates on these tubes extend back to the early 1980s, or even into the 1970s. Long term storage can be an issue, if the tubes were not well protected. Pins and wires can corrode (both internal and external to the base), base cement can fail, and so forth. In my view, a batch of pristine -J would be preferable to a dodgy looking batch of a higher spec.

The current batch of Chinese 6N5P being shipped by Atma-Sphere are the -J suffix. Our prime requirement was that the tubes have some level of mil-spec ruggedness rating, above and beyond civilian / industrial. To be frank, they have well exceeded our expectations. If the -J are this good, one wonders what there is left to be gained from higher specs.

Over the years, batch quality has varied somewhat with the Russian tubes. The most recent batches of Svetlana 6N13S were the best (certainly the most consistent) I can recall working with, and these Chinese 6N5P-J are no worse.

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Follow Ups Full Thread

Topic - Interested in buying bulk 6AS7's - Coffeecupman 12:34:45 10/17/06 (16)

Re: Interested in buying bulk 6AS7's - David M. 15:50:15 10/29/06 (0)

200 parts is a minimum ! - Coresta 13:24:43 10/21/06 (4)

Re: 200 parts is a minimum ! - Coffeecupman 20:59:10 10/21/06 (0)

Re: 200 parts is a minimum ! - Legendre 15:19:48 10/21/06 (2)

Re: 200 parts is a minimum ! - coresta 12:11:55 10/22/06 (1)

Re: 200 parts is a minimum ! - onuroztuncer@hotmail.com 06:37:18 04/17/07 (0)

Re: Interested in buying bulk 6AS7's - Legendre 18:02:36 10/18/06 (3)

Thanks Bill - Coffeecupman 23:47:34 10/18/06 (2)

Re: Thanks Bill - Legendre 16:34:29 10/19/06 (1)

Re: Thanks Bill - jb0194 17:20:16 10/19/06 (0)

why do you want so many? /nt - chosenhandle 06:28:51 10/18/06 (5)

Re: why do you want so many? /nt - Coffeecupman 23:51:38 10/18/06 (1)

sounds like a good idea then! /nt - chosenhandle 07:43:59 10/24/06 (0)

Re: why do you want so many? /nt - tubevibb 08:29:46 10/18/06 (2)

tubevibb? - Coffeecupman 20:48:32 10/19/06 (0)

Re: why do you want so many? /nt - Coffeecupman 23:59:00 10/18/06 (0)

Follow Ups

Re: Thanks Bill - Legendre 16:34:29 10/19/06 (1)

Re: Thanks Bill - jb0194 17:20:16 10/19/06 (0)

Re: Thanks Bill

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