SET Asylum

Single Ended Triodes (SETs), the ultimate tube lovers dream.

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RE: 300B - Is this thermal runaway ?

Posted by Burney on October 26, 2021 at 08:47:34:
I had this 300B ebay PCB to try out. Wired up everything and used a few days. It just wasn't as magical as the EL34 SE I had been using for several years. The EDCOR OPT's were repurposed from the EL34 SE amp and they worked fine with the ebay 300B PCB. No thermal runaway. I also recall 300B cathode had higher voltage, about 72VDC whilst using the ebay PCB. B+ was almost same

Got ambitious and put together the WE91 clone. And here we are in this situation.