[Boatanchors] 813 grid to filament short

[Pete Lancashire]

A failure analysis would be interesting. Take the tube apart and slowly
remove the plate, quite easy to do with an 813

On Wed, Sep 30, 2015 at 5:46 PM, Paul Baldock <paul at paulbaldock.com> wrote:

> I have a home brew AM rig with 4 x 813's (2 rf and 2 mod). The 813's are
> mounted horizontally as specified. The rig has been getting a good workout
> over the last few days with excellent 21MHz conditions. It runs  400W of
> carrier and 1500W PEP.
>
> Today one of the modulator 813's has developed an intermittent short
> between grids and filament.
>
> I was just wondering if this is common failure for old 813's.
>
> - Paul   KW7Y
>
>
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