WD=?ISO-8859-1?B?2A==?=HCO wrote:
OK I NEED HELP - REALLY I DO ...

I AM PLAYING WITH A MICROWAVE OVEN -

WOULD LIKE TO REDUCE THE POWER OUTPUT OF THE MAGENTRON -

AS IT IS - IT IS SETUP FOR 600 WATTS PULSED ERP - THAT IS SHE PEAKS AT 600
WATTS 60 TIMES A SECOND -

ANODE VOLTAGE IS 4500 VAC THROUGH A 125 VAC STEP UP TRANSFORMER.

I WANT TO KEEP THIS VOLTAGE BUT WANT TO REDUCE THE CURRENT TO REDUCE POWER.

You can't do that. From the supply side, the magnetron is basically a big
diode. There is no grid. All you can do is adjust the voltage across it,
and the current will follow.

ANY IDEAS ? ALREADY TRIED A VARIAC ON THE PRIMARY - IT REDUCED VOLTAGE BUT
DID NOT REDUCE POWER UNTIL THE MAGNETRON STOP OSCILLATING COMPLETELY.

Right. It's not really intended to operate over a very wide range.

There _is_ an article from Radio-Electronics in the mid-nineties on
those things... they give some methods to modify them and to get them
operating well out of their normal regime. Detuning it may be the
easiest way to reduce the output level.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."