question on a 2950

[PLUTO]

chris,

The clear mica insulators can cause the problem your describing in a 2950/70. Put the ceramics in. And make sure the main board screws are tight.

This is what I was asking about, I'm not implying that is wrong...just trying to understand how the mica insulators would cause the problem.

A difference in thickness will cause a difference in the package substrate (which on that transistor is the collector, B+, which also makes it the one that is on the "output" side of the stage) will cause a difference in capacitance.

That, or a cold solder joint. Flexing the transistors around while replacing the insulators could have found and exploited a cold solder joint.

--Toll_Free

Thanks, that makes sence on both. I've replaced the ceramics before on different radios with mica and didn't see that problem, but I always un-solderd and removed the transistor(s) and after cleaning off the old compound, replaced them with fresh, the re-soldering after mounting and checking for shorts on collector to case or heatsink. Again, thanks for your input.

 

[W1R3T4P]

Toll free hit the nail on the head, 100%. This is part of our "high performance" package on most of the export radios. remember, if the Chinese can save .02 a radio, they will.

Do you do this package to Connex radios?