[Amps] why not graphite anodes?

[Carcia, Francis A HS]

Sept price 

-----Original Message-----
From: R.Measures [mailto:r at somis.org] 
Sent: Thursday, September 29, 2005 3:00 PM
To: John T. M. Lyles
Cc: amps at contesting.com
Subject: Re: [Amps] why not graphite anodes?


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 at 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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