[PVRCNC] Transmitting Tubes

[Guy Olinger K2AV]

3-500? You mean 3-500Z?  3-500Z can be tested in an SB220/221, AL82,  a lot
of LK-xxx amps two tubes at a time, AL80x one tube at a time.

4CX1500 is tough, not used much, and the A or B is significant, not same
tube.  The tube (either) can be toast even though the filament has
continuity. Ebay answer is filament continuity no way to test.

I haven't seen an amp running a 250TH in decades.  That is extreme oldie,
old in the '50's. It's probably OK if you have continuity on the filaments.


4CX1000A is the tetrode used in Alpha current top-of-line manual tune amp,
8410.  8410 uses a pair of 4CX1000, if you know someone who has one.

73, Guy.

On Sun, Feb 27, 2011 at 3:48 PM, Nathan Moreschi <n4ydu at yahoo.com> wrote:

> PVRCNC,
>
> I've acquired several transmitting tubes that I would like to test in
> some way.
>
> Here's what I have:
>
> (4) 3-500
> (3) 4CX1500
> (1) Eimac 250th
> (1) 4CX1000
>
> Can anyone in the club help with this process?
>
> 73,
>
> Nate/N4YDU
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