[AMRadio] SX-28 help

[Donald Chester]

> > Anyone have any solutions to why these tubes are getting so hot?


I had the same problem with my external receiver audio amp.  It uses a pair 
of 6V6's in the output.  I  checked all voltages: filament, bias, screen and 
plate, plus cathode current, and all were within spec according to the RCA 
tube manual.  Still the tubes ran super hot, and only lasted a few months 
before they began to test weak.  I increased the cathode resistance and 
decreased the screen voltage, which dropped the cathode current 
substantially.  The tubes now run cooler, and so far, have not crapped out 
prematurely.  I have quite a few 6V6's on hand, but tubes are still scarce 
enough that I can't afford to replace them every few months.

Don K4KYV

_________________________________________________________________
Check your PC for viruses with the FREE McAfee online computer scan.  
http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963