开云体育

It appears that now, my older Eimac 3-500Z tubes are the cause of the parasitic oscillations. I replaced the tubes with a newer set of 3-500ZG's and it seems to be working much better.? It seems the tubes were a problem under load I also replaced the parasitic chokes resistors with some 100 ohm 5 watt, MOF resistors.? Can't see any appreciable lowering of power out or tuning problems. I do know I have to readjust the Plate current meter reading, so will be taking it apart again. Will keep my fingers and toes crossed hoping for the best now. Thanks for all the hints and advice.

73? Bob

Plate current is a fixed meter shunt. What is adjustable is the grid current metering. And the high voltage meter, but you don't want to mess with that unless you have a real HV probe. It's not critical anyway. Grid metering is.

On Fri, 03 May 2024 19:52:31 -0700
"K6OXN Bob via groups.io" <bobk6oxn@...> wrote:

I do know I have to readjust the Plate current meter reading

--

73

-Jim
NU0C