A Brimar 6SN7GT NOS double triode valve. It is still in its original box although the box has deteriorated through age. Old carboard is acidic and turns brown as the cellulose in the box breaks down due to the acidic action.
This is a UK made original Brimar and we have tested it for insulation and shorts. It works perfectly with anode currents of 9.8 and 8.2mA respecively with 250 volts HT and -8 volts bias. It is spot of specification as you would expect for an NOS unused valve.
It has smoked glass and a black base ( see picture)
We only have one of these valves . A rare find for us
We also have the Sovtek and EHX variants of this valve
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