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Tube in subset?

Started by Jack Aman, September 27, 2016, 08:55:10 PM

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Jack Aman

September 27, 2016, 08:55:10 PM
Does this subset have a vacuum tube in it?  It looks to have been taken out of the circuit.

rdelius

#1
September 27, 2016, 09:19:09 PM
Technically not the usual vaccum tube but a cold cathold tube for 4 party ringing
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