RE: Shuguang Treassure Series KT88-Z vs. NOS Gold Lion KT88

I elected to wait until the latest factory production run was available so my Chinese seller could select the highest and best matching plate currents, and hopefully the highest transconductance values. Should be here in about a week. And I'll let everyone know.

In the meantime it's interesting to NOTE a few fine points about these tubes and the whole B Grade and Premium A Grade thing:

Shuguang only matches actual plate current values at the factory; other parameters, particularly transconductance, are checked qualitatively (good/bad). Are they lazy? No. Apparently, there is no point in testing fresh tubes for those other values, because with these coated tubes, they really do have to burn in for 300 hours before such measurements would mean anything.

I ran my first quad for 85 hours before I got word the factory wanted to replace them all, but by 85 hours they produced sonics that would convince anyone used to any other KT88's. And upon re-measurement, it appeared the Gm values were starting to rise -- so maybe these tubes do in fact require a long burn-in time just to achieve their "new tube" specifications.

Of course those of you familiar with the Canadian seller's pitch regarding alleged "additional testing and matching" (for which he tacks on an additional $300!) might question what value that would have if carried out before 300 hours of operation ;--)

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Follow Ups Full Thread

Topic - Shuguang Treassure Series KT88-Z vs. NOS Gold Lion KT88 - nsgarch 16:26:32 03/8/10 (6)

RE: Shuguang Treassure Series KT88-Z vs. NOS Gold Lion KT88 - cycle 18:42:36 05/4/10 (0)

RE: "Fuller" KT88 - nsgarch 19:16:22 05/15/10 (0)

RE: Shuguang Treassure Series KT88-Z vs. NOS Gold Lion KT88 - cycle 18:59:49 05/4/10 (0)

RE: Shuguang Treassure Series KT88-Z vs. NOS Gold Lion KT88 - cycle 01:32:37 04/8/10 (0)

RE: Shuguang Treassure Series KT88-Z vs. NOS Gold Lion KT88 - LinuxGuru 01:58:54 05/16/10 (0)

RE: Shuguang Treassure Series KT88-Z vs. NOS Gold Lion KT88 - nsgarch 04/10/1011:00:51 04/10/10 (0)

RE: Shuguang Treassure Series KT88-Z vs. NOS Gold Lion KT88 - gortnipper 18:38:58 04/10/10 (0)

see next post: waiting for replacements . . . . .nt - nsgarch 19:17:11 04/10/10 (0)

RE: Shuguang Treassure Series KT88-Z vs. NOS Gold Lion KT88 - bigjppop 17:46:32 04/10/10 (0)

waiting for replacement tubes - nsgarch 19:15:21 04/10/10 (0)

RE: Shuguang Treassure Series KT88-Z vs. NOS Gold Lion KT88 - bushpilot 10:18:25 03/18/10 (0)

RE: Shuguang Treassure Series KT88-Z vs. NOS Gold Lion KT88 - dolasu 06:20:03 03/14/10 (2)

RE: Shuguang Treassure Series KT88-Z vs. NOS Gold Lion KT88 - nsgarch 19:07:44 04/10/10 (0)

not like other Shuggy KT88's - nsgarch 10:31:40 03/18/10 (0)

RE: Shuguang Treassure Series KT88-Z vs. NOS Gold Lion KT88 - nsgarch 10:07:43 03/14/10 (0)

RE: Shuguang Treassure Series KT88-Z vs. NOS Gold Lion KT88 - Uncle Mike 18:17:45 03/8/10 (1)

EAT manufacturer - nsgarch 18:48:31 03/8/10 (0)

Follow Ups

RE: Shuguang Treassure Series KT88-Z vs. NOS Gold Lion KT88 - nsgarch 04/10/1011:00:51 04/10/10 (0)

RE: Shuguang Treassure Series KT88-Z vs. NOS Gold Lion KT88 - gortnipper 18:38:58 04/10/10 (0)

see next post: waiting for replacements . . . . .nt - nsgarch 19:17:11 04/10/10 (0)

RE: Shuguang Treassure Series KT88-Z vs. NOS Gold Lion KT88 - bigjppop 17:46:32 04/10/10 (0)

waiting for replacement tubes - nsgarch 19:15:21 04/10/10 (0)

RE: Shuguang Treassure Series KT88-Z vs. NOS Gold Lion KT88

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