Tube Data Sheet

[Keith Rowland]

Hi Dick:

I can't find my data sheet on the 304-TL, either, but I do have the
following information from an old publication, telling how to put them to
use in the early 50s, even tho they were already obsolete even then:

Filaments:  5-v/50A or 10-v/25A (250-watts either way!).
The article says that at 2500-3000-v, a pair of them will give 600-watts of
zero grid current audio power.  He says the spec sheet states that at 2500-v
in Class C phone operation, a pair requires only 36 ma. of grid current
(22-watts), plus circuit losses.

His data was for 2500-v on the plates, with -300-v grid voltage at RF, and
-290-v as modulators.  Additional grid leak bias is needed when used at RF.

So if at 2500-v plate voltage, a pair gives 600-w of audio, you can easily
figure what the plate current should be to arrive at 600-w of output.  And
you should be able to run them in Class B or AB2 linear operation for SSB at
RF using the audio ratings.  They're pretty rugged old bottles!

Hope this helps.

73,

Keith



Dick Blaney wrote:

> Hi all,
> Wondering if anyone has a data sheet for the Eimac 304TL tubes.  I've
> got a hankering to build up a 'shack warmer' vintage style junk-box amp,
> and can't find my old sheets.  Think they  must'a been trashed sometime
> back when.  Will gladly reimburse for copying etc.  Thanks in advance.
> 73 de
> Dick, WB8MHE
> wb8mhe at bright.net
>
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