[Amps] illegal amps?

[EP Swynar]

Hi Ray,

A good point, well made...

Another thing I discovered --- after I first fired-up the Palomar on 10-meters & called CQ --- was that the doggone thing sounded just AWFUL at the other end. All I did initially was re-peak / tweak everything to play up above 28-MHz, but the distortion was terrible.

I ended-up biasing the control grids of the two 6LQ6 sweep tubes by way of a 9-volt battery, and the improvement in signal quality was remarkable. The only caveat (beyond that, of course) is that these old mobile tube-type amplifiers used (then) state-of-the-art germanium power transistors in the multi-vibrator circuits of their power supplies, which can cost an arm & a leg in to-day's NOS replacement market. An ample junque box is gold in this way...

~73~ Eddy VE3CUI - VE3XZ


******************************************************************************
 
  ----- Original Message ----- 
  From: RAY FRIESS 
  To: EP Swynar ; amps at contesting.com ; af2c at njdxa.org 
  Sent: Friday, August 29, 2008 1:13 PM
  Subject: RE: [Amps] illegal amps?


   
  Did the same thing here.   Picked up a Palomar 300 (one with the external transformer) for 20 bucks from a CBer who was
  moving and didnt want to take it with him.  Did a little changing to eliminate any harmonics and it is usable on 40 through 10.
  10 to 20 watts in gets up to 500 out.   Will be great when 10 meter AM comes back in.
   
  One word of caution.  When using an HTX 10 especially, turn down the audio gain to cut down the power output on SSB.
  Otherwise you have WAY too much output for driving these amps.