[Amps] why not graphite anodes?

[John T. M. Lyles]

>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 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