The problem I observed is that they develop filament to cathode shorts ...
sometimes during the warm-up cycle sometimes all the time after warm-up ...
this shows up as idling plate current while in standby.
Terry W6RU
----- Original Message -----
From: Phil Clements <philk5pc@tyler.net>
To: Steve Thompson <amps@txrx.demon.co.uk>; <amps@contesting.com>
Sent: Monday, August 02, 1999 8:53 AM
Subject: Re: [AMPS] 8877 bad date codes
>
>
> >How do problems with these tubes show up when you use them?
> >
> >Steve
>
>
> They will fail in a relatively short time.
>
> (((73)))
> Phil, K5PC
>
>
>
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