|23rd February 2020, 04:34 PM||#1|
Join Date: Mar 2012
Location: Allentown, PA
R25 smokes in tse 300b
My TSE sat Idle for some years because I was having issues with it and and only now getting back to get it running again.
this TSE is setup for 300b tubes.
I powered up with just a rectifier.
After some a few min. R25 smokes. I replaced R25 and R14.
Figured I should start out with the proper checkout steps.
Filament voltages were 4.95 each
again b+ 440, b- -175
Grid of right output tube is -58
Grid of left output tube is +350 and slowly climbing
With rectifier in after a few min. r25 starts to smoke again.
I measured across r25 and getting over 600 volts.
So, where do I go from here?
|23rd February 2020, 06:42 PM||#2|
Join Date: Jul 2005
Location: West Virginia panhandle
The mosfet connected to R25 (Q2) is shorted. Replace it.
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
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