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RE: Bas are you using your B7 yet?

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I would guess that there is probably a US equivalent of the subminiature 1Z16B, maybe not with the separate anode "cap" pin out the top. These were used in hearing aids, smaller sized tube portable radios, proximity (variable-time) fuzes, and lots more pre-transistor applications. The Russians continued to advance their subminiature tube technology, well after we went to solid state almost exclusively.

With the relatively light 1Z17B's filament current, and only 2 mA or so of plate current, 4 mA total for two channels, a collection of 6 or 7 series-connected 9V batteries would probably last a very long time. And no AC hum problems to fret about... THere are 10 AH NiMH D cells available, perhaps higher current now, I got my D-size (solder tabbed) 10Amp'ers a couple years ago from zbatteries.com

/ed B in NH





/ed B in NH
real radios glow in the dark

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