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It didn't take a wizard to build that thing... By the way, you can make those Russian tubes hum without a center tap filament transformer. The first time I used them, I assumed the center pin was the cathode and applied bias there. For some reason the foreign data sheet had me entirely focused on the numbers and I never even looked at the picture of the pinout. I'm embarrassed to admit how long it took me to figure out, that picture was worth a thousand words. If you get one that hums, make sure someone didn't do what I did and apply bias on the center pin. The middle ring is your cathode connection on these tubes.

[QUOTE="Shockwave, post: 753038, member: 10882"] It didn't take a wizard to build that thing... By the way, you can make those Russian tubes hum without a center tap filament transformer. The first time I used them, I assumed the center pin was the cathode and applied bias there. For some reason the foreign data sheet had me entirely focused on the numbers and I never even looked at the picture of the pinout. I'm embarrassed to admit how long it took me to figure out, that picture was worth a thousand words. If you get one that hums, make sure someone didn't do what I did and apply bias on the center pin. The middle ring is your cathode connection on these tubes. [/QUOTE]

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