[Collins] 312B-4

[Cam and Juli Hedrick]

Hi gang,
I've noticed that my 312B-4 and 312B-5 read output power levels lower by
about 12% and 20% respectively than my Bird or Drake which give identical
readings.  I've used two different plugs in the bird and gotten the same
reading.  What's up...Caps out of value, or maybe carbon resistors?
By the way, an engineer with IRC has informed me that you can bake a carbon
resistor and bring it back into tolerance.  Has anyone ever heard such a
thing before?
I'll dig deeper, but then again the other meters are working fine.
Thanks 
Cam 
WA4JKW