>Hello All,
>What is the typical 8930/DX393 plate current on 222 and 432 MHz?
>Please reply direct. Thanks & 73,
>Tony WA8RJF  EN91 QRV: DC, 6 - 2304 & 5760 

Tony, way over 500 mils! But unless you've moved the two diodes across the
meter itself instead of in front of the 4320 ohm meter multiplier resistor,
the diodes will conduct and shunt the plate current, preventing the meter
from reading any higher than about 300 mils. This mod was discovered by
KF0M in Wichita a few years ago and is not very widely-known. And some
remove it because under normal conditions when output power is over 400
watts, the plate meter is pinned and can't be read anyhow!

It's easy to check this out using an external meter; simply connect the
external meter in series with the thick red wire with the spade terminal
that's connected to the rear post of the large oil-filled capacitor in the
HVPS. Make certain that you place the external meter on a thick book or
something as it will be at the plate voltage of 2400+ volts no-load! And do
NOT key up the amplifier if the wire through the meter comes loose; you
could blow the screen grid of the tube with no plate voltage.

On idling with no RF drive, set the grid bias for 90 or 100 milliamperes
resting current. All of these numbers apply also to the Svetlana 4CX400A.

73, Steve K0XP

From:             Electronic Service Place 
Subject:          RE: AM6155/ 6154 help page..(Do you have experience?) 

I converted one to 222mhz. Fairly straight forward using information from 
K0LTM (I think the call is correct). Another two people you may want to 
contact include VA3ST Stan Thum and VE3BFM Bob Morton, and most importantly, 
another VE3 whose call sign escapes me right now and who is with Sinclair 
Labs as I recall. This last ham has written extensively on the subject and I 
have some of his info around here.

Remind me, and I will try to locate the file on conversion information and 
get you accurate callsign and contact information.


John R. Hagle       N2JH     ex     AA2GV and WA2SXH