[Johnson] Pacemaker Problem

[David C. Hallam]

I have run into a problem in the alignment of my restoration project 
Pacemaker.  The two carrier crystal oscillator signals for the balanced 
modulator are taken from a 12BH7 cathode follower at a common point. 
The two signals go a switch.  One to a front wafer and the other to a 
rear wafer.  The front wafer has switched capacitors for each band and 
the rear wafer has switched slug tuned coils to get the 90 degree phase 
shift.  The Pacemaker uses a different carrier oscillator frequency for 
each band.

Then each signal is connected to the balanced modulator tubes.  The wave 
forms on all bands from the front wafer with the capacitors look good on 
the scope.  The ones from the rear wafer are distorted for the 80M and 
40M bands.  10M and 15M are good and 20M is probably OK.  The distortion 
shows up as a knee on the first 90 degrees of the sine wave.  So far no 
amount of twiddling with the oscillator output voltage or the phase 
shift adjustment has cleared this up.

Any ideas?

David
KW4DH
-- 

I predict future happiness for Americans if they can prevent the
government from wasting the labors of the people under the pretense of
taking care of them.
Thomas Jefferson