On Sep 29, 2005, at 7:05 AM, John T. M. Lyles wrote:
>> Date: Wed, 28 Sep 2005 14:17:44 -0700 (PDT)
>> From: Joe Isabella <n3ji@yahoo.com>
>> Subject: Re: [Amps] 3-500Z and ZG triodes
>> Hi John,
>> Is there some reason you don't want the graphites? I have found
>> them extremely rugged -- the Eimacs I had literally fell apart.
>> I've been abusing mine (RF Parts Brand -- Taylors, I believe) in my
>> Henry 3K-A fairly regularly over approximately 3 years now, and they
>> simply keep on making power. I've had them very bright orange on
>> nice loooonngggg AM round-tables, been through a few contests, and I
>> would definitely buy them again. They will still do about 2kW
>> output easily.
>>
>> Joe, N3JI
>
>
> Yes, I am trying to retrofit a pulse modulator here at work, that
> used 3-400Zs and I would like to switch to 500Zs
In pulse service. 3-500Zs offer virtually no advantage over 3-400Zs.
> without too many
> changes (i.e., going to graphite). If thats all that I can get, I
> will try them. We are buying a couple of types (Chinese, Amperex,
> etc) from RF Parts to evaluate in our application. Tired of paying
> out the nose for NOS 3-400Z which haven't been produced in ages. We
> are beginning to see leakage from grid to cathode for them, just
> using an ohmmeter.
>
> 73
> John
> K5PRO
>
>
>
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>
>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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