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Circuits TH327
Category: EME Equipment, Created: 2001-10-14 18:19:59

Many times, EMEers asked for assistance in feeding the TH327 cathode. In order to reduce the cathode current fully during rx, the original supply by the PLISCH device is not sufficient.
Therefore, higher voltage is needed to get there.
The picture of my cathode supply is here: Furthermore, Peter OE9PMJ (SK) has lots of experience to this topic.

Heater Voltage for 1296MHz:

TH327 6.1 V
TH347 6.3 V

The cathode supply
Sorry, drawing off the bench!

Here comes the drawing by Peter OE9PMJ which explains mechanical and circuitry modifications;
Courtesy by Peter, OE9PMJ for this interesting drawing

The Plisch PA and its original power supply limit the current of G2 to 17mA. For best performance this value is to be enhanced to 50mA. This is the way to do it.

This circuit enhances the current from 17mA to max 50mA in the Plisch Power Supply Sorry, drawing off the bench!

TH347 Datasheet
page 1 page 2 page 3 page 4 page 5 page 6 page 7

A very useful source for all kind of tube data: DF6NA

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