And they (Chinese 3-500z`s) seem to have somewhat higher mu than Eimac
3-500z. If you have equipment that shows signs of instibility with Eimac
valves (So called "Parasitics") Chinese tubes will probably make these
events more frequent and pronounced. Jim.
----- Original Message -----
From: "rlm" <r@somis.org>
To: "AMPS" <amps@contesting.com>; <jaking@es.co.nz>
Sent: Monday, April 05, 2004 12:08 AM
Subject: Re: [Amps] SB221: Can you saftely mix and run an Eimac 3-500Z
withand RF Parts 3-500ZG-RF ?
Chinese 3-500ZGs are compatible with Eimac 3-500Zs in that they have
c. the same ZSAC at the same bias-V. -- i. e., they have a similar Mu.
cheers
On Apr 3, 2004, at 3:26 PM, Jeff King wrote:
>
> A question from a new comer. While rebuilding the SB221, I turned it
> on at
> final test and one tube did not light well, then after about 15
> seconds long
> 15 mm long sparks in side near the base, then does not light at all,
> and it
> is slightly whiter inside. Dam!
>
> I need another Eimac 3-500Z. (Not easy to find, Only 3-500ZG is
> available
> new.)
> One reads occasionally that it is not so important to have matched
> pairs of
> tubes. How much can you safely miss match tubes? Does this extend so
> far
> that one could run an different brand tube, Ie an RF parts 3-500ZG-RF
> or a
> Taylor 3-500ZG with and Eimac 3-500Z?
>
> You will probably laugh at this. Does anyone have knowledge of safely
> running such a pair of different tubes?
>
> I look forward to your advice.
>
> Yours sincerely
> Jeff ZL:4AI
>
>
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>
Rich Measures, AG6K, 805.386.3734. www.somis.org/
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