12bh7 tube pair Marconi valve made in Italy 12bh7a
long Black plate
Dark carbon ribbed tugged ruggedized plates anode
O getter halo Green Marconi Labels on glass
tested strong 82/86 results on TV7 tube tester calibrated (reference good is 30/30)
ultra rare tubes with great sound on power amplifier like McIntosh
12BH7 is a dual triode twin triode double triode for McIntosh Power Amplifiers
Socket is Noval B9A
Filament heater Vf 12.6 Volt / If 0.3 Ampere / Indirect / Parallel / series ~ = AC/DC
12BH7 12BH7A vacuum tube is a medium mu dual triode, 12bh7 is capable of driving good amounts of current with low distortion. This makes it ideal as a driver for power tubes in modern audio amplifiers.
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