[AMRadio] request for info on using the 6C21

[Barrie Smith]

Eimac specified 8.3 volts for the 6C21 in pulse service.

7.5 volts is the correct voltage in non-pulse service.

73, Barrie, W7ALW


----- Original Message ----- 
From: "Geoff Edmonson" <w5omr at w5omr.shacknet.nu>
To: <amradio at mailman.qth.net>
Sent: Thursday, January 29, 2004 5:06 PM
Subject: Re: [AMRadio] request for info on using the 6C21


> > This is at the expense of tube life.  If the tube is run at 7.5 volts it
> > will do just fine in modulator or rf power amp service, and will last
much
> > longer.  Essentially, Eimac said run a 450T's filament voltage up, and
it
> > will deliver incredible peak power while it lasts, but will have a short
> > life.
>
> Was it you, Don, who also said (at one time) that running too little of
voltage
> on filaments can have the same undesireable effect on tube life?
>
> 73 = Best Regards,
> -Geoff/W5OMR
>
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