Thanks Ron NR8O for the following info which is nearly impossible to find on the web.

  This is the procedure to set the driver and final bias on the Pegasus. I cut and pasted it here
  for all to enjoy. The driver and final sets are also impossible to identify on the web, none of
  this stuff is listed anywhere. Now its all in one place. The drivers are 2sc1969's (pair) The 
  finals are a pair of MRF 454's in mine. There are two adjustments on the right side of the radio
  with the cover off viewing the final board. On the final board there are two pots which you can view
  thru the metal cover, the lower pot adjusts driver bias, the upper pot does the finals. Most people 
  can insert the ammeter in the power line and with the pots turned CCW, ssb,20m USB into a dummy load 

(One pot may be CW to zero, it was on mine meaning one zeroes at ccw and 
the other zeros out going clockwise, I forget which. added 12-9-12)

  No audio, key the rig and jot down the current draw on TX, adjust the pot on the drivers to add 50ma
  to the total current draw, then adjust the finals to add 500ma on top of that and you are done. See Rons Post 
  below.

     Thanks, Richy N2ZD




Hi Rich, I meant to reply to your post a week ago and just getting around to it.

I'm going to assume that you replaced your final and or driver transistors in
your Pegasus. As you might have realized, there isn't any swr foldback
protection in these rigs, instead relying on current protection either from a
ten tec supply or some other means of protecting the finals. It's something I
wasn't aware of my I bought my 550, but worth reading up on if you aren't
familiar with.

Anyway, the final high power amplifier in the Pegasus is almost identical to
that used in other Ten-Tec rigs like the Omni-VI, and the bias setting procedure
is the same. Ten Tec has (or used to have) the model 563 users manual available
for download on their website and chapter 4 page 51 gives a nice description
including how to set the bias. I haven't been on their site in a while and if
you can't find it I can shoot you a copy.

Basically you want to "key" the final amplifier without applying any rf drive
while measuring the current draw. You can unplug the small coaxial drive input
cable from the low pass filter board to eliminate any rf drive, and you can key
the final amplifier by supply 12 volts to the blue "T" (for transmit) line.
Rotate both R19 and R15 for minimum current (can't remember if it's cw or ccw),
then rotate R19 (driver bias pot) for 50 ma of DC current. Finally, rotate
final bias pot R15 for an additional 500 ma of current draw, for a total of 550
ma. And that's it.

Another way you can set the bias if you happen to have the final amplifier out
of the radio and the cover off, instead of monitoring current draw, just supply
DC voltage to the board along with positive DC to the blue "T" line to key it,
and use a DC voltmeter to measure the voltage at the base of both your driver
and final transistors. Use your bias pots to set both base voltages to .7 volts
DC.

Both methods will get you above what is called the knee voltage region of the
transistors and you will have good linearity on transmit.

Ok, hope I didn't blabber on too long here Rich. In short, to answer your
question, it's 50 ma for the drivers and 500 ma for the finals. ;-)

Good luck and 73, Ron NR8O