12bh7 tube pair fivre marconi valve 12bh7a nos long plate rca brimar 6b4g 12au7

4 tubes = matched quartet = 4 vintage valves = 4 pcs = four pieces

tested strong tubes & balanced between triodes

same code same lot of production 1950's

blue label mint tubes matched quartet quad = 4 tubes

12bh7 tube pair Fivre oldest production valve made in Italy 12bh7a nos

Test results: 98 & 98 ; 96 & 94 ; 92 & 92 ; 92 & 92

( reference goos is 30 & 30 )

tubes are super strong & balanced between triode sections

long dark grey plate
Dark grey ribbed rugged ruggedized plates anode
O getter halo BLUE FIVRE Labels on glass 1950's
same code on glass  same old stock oldest production best sound performances

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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