[Premium-Rx] Mackay question

[GandalfG8 at aol.com]

In a message dated 29/08/2007 22:36:43 GMT Daylight Time,  W9RAN at oneradio.net 
writes:

have two  ITT Mackay synthesized general coverage receivers, a model 
3020A and a  3021A, the only difference being the tuning method (dial vs  
thumbwheel-type switches).   Both have the same problem and I've  been 
unable to nail down the source.   The problem is on USB or  LSB mode (or 
presumably on CW, although I haven't tried) - the audio will  develop a 
low-rate "gurgling" sound after a while (it sounds like bad AC  
modulation).   Usually the audio is fine after power-on, but  develops 
soon thereafter.  I suspect this is due to some kind of  ripple or 
component-aging in the PLL but would be interested in any  suggestions
-------------------------------------------
Hi Bob
 
I've not had any experience of these particular Mackay sets, so  
unfortunately not able to offer any specific advice, but I do have a pdf copy of  the 
3020A manual if you haven't already got one.
 
Regards
 
Nigel
GM8PZR