[R-390] R-390 If transplant

[pete williams]

G'day list.....

 Well, a  few have  asked  why do it--  transplant  that is. Apart  from technical 
reasons and  the   cliche  type question," why  climb Mnt  Everest--- answer "because 
it's  there", an  economic  theme  emerges... Out this  way  mech. filters are  like 
our rain free  drought : they aren't thick on the ground,  infrequent  and  costly on 
the   auction place .
 For  my part, relatively  fire proof  LC filter  as in the   IF/ R-390 module  takes 
a  bit of the  worry out of  unwanted volts  and aging   filter suspensions.

Incidentally.... I had heavy  distortion  with a strong broadcast stations and AGC 
switched to * slow*   The  AGC line V  seemed  a  bit  low but on impulse  checked 
the  alinement of Z503, the  tuning  coil to the   AGC  amp. Result :   as the  AGC 
volts increased, the  distortion  for same  settings  decreasd(naturally!). Off tune, 
AGC levels assumed lower level  as  one might  expect
Further  investigation required  as  there's  probably more  to it  ....  any  clues 
?
Thanks
 Pete

Pete D..Williams
METUNG, 3904
AUSTRALIA
jupete at bigpond.net.au