I can't remember exactly, but may be I tried with 60 to 90V (a small chinesse step-up board). With lower voltage the first valve does not oscillate at FM frecuency (or I was unable to do it). The main interesting think is that I've built a separate quench oscillator with one separate tube, using a small transformer from a ISDN endpoint. 
Too I'm using a 22v to 24V as audio output transformer.
Allmost all componets come from scrap.
Total tube count is 4.
I need to reopen the carton case where I put the radio and the pencil schematics after take this video, clean it and put some more info here and there..
Too I'm using a 22v to 24V as audio output transformer.
Allmost all componets come from scrap.
Total tube count is 4.
I need to reopen the carton case where I put the radio and the pencil schematics after take this video, clean it and put some more info here and there..
