[Gonset] Communicator 2 Squelch Drifting

[W0rw at aol.com]

My Gonset Communicator 2 squelch is drifting a bit with temperature.
It is OK at cold temperatures but gets tighter and tighter at elvated 
temperatures.
 i don't have a lot of spare tubes. 
Maybe the 6T8 or 9006 is dropping out.
i replaced a 0.01 ceramic coupling cap going to 6T8 pin 8 that was very heat 
sensitive, that helped a bit.
Any solutions for this issue besides a fan ?
i have had the heat gun and freeze mist out already.
Paul  w0rw