I would check the plate current meter and the connections to it.
73, Mike
www.w0btu.com
On Tue, Jul 14, 2015 at 3:47 PM, Guido Tedeschi <guidoted@gmail.com> wrote:
> Hello All,
> a homebrewed two chassis 3CX3000A7 GG amp of a friend has this strange
> failure when switched on TX:
> - no more current on plate meter
> - 200 mA of grid current with no signal
> - some power out (few hundred Watts) when driven with 40-50 W, to limit
> the grid current to less than 500 mA, but still no current on plate meter
>
> We don't have any schematic diagram
>
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