[TMC] GPR-90 6BE6

[Dave McDonald]

John and TMC Net

Has anyone experienced the converter tube, 6BE6, quitting after about an hour from being turned on?  Swapping tubes doesn't help.  The pentagrid converter works properly but after about an hour quits oscillating and receiver goes dead.  OK when switch to lower bands where dual conversion turns off doesn't help.  I tried with IERC heat dissipating shield but no help.  I leave the shield off so can swap tubes to see if helps.  Tube cools off and starts oscillating again.  I haven't tried swapping the 220 pf cap, C33, yet and don't really want to.

Any help?

Tnx,

Dave K4EWC