6sn7 tube gt Marconi Italy tubes amplifier preamp = b65 vt-231 ecc33 33s30
Made in Italy original Genuine Vintage sound from 1950's
( 1 piece = 1 tube = one vacuum tube = 1 valve )
VALVE grey PLATE squared GETTER BOTTOM
RUGGED PLATE
BIG LARGE PLATES
black thick BASE
tested strong 110/110 on TV7DU ( reference good 50/50 ) D getter
Double triode
Socket Octal K8A
Filament Heater Vf 6.3 Volt / If 0.6 Ampere / Indirect / Parallel, ~ = (AC/DC)
The 6SN7 was used as an audio amplifier in the 1940-1955 period, usually in the driver stages of power amps.
The designer of the famous Williamson amplifier, one of the first true high-fidelity designs, suggested use of the 6SN7 (or B65) in his 1949 revision since it is similar to the original circuit's L63 (= 6J5 ) British single triodes, four of which were used in each channel of his 1947 circuit. VERY RARE TUBES VALVES FOR PRE AMPLIFIER PREAMP DRIVER
box 77