One of the highest quality directly-heated triodes, made in England under Air Ministry supervision in the 1950s. For single-ended or push-pull circuitry, up to 20 watts (continuous sine wave) in push-pull, or 8.5 watts in S-E. 4 volt filament, B4 base. New, old stock, fully tested on my AVO Mk 4 valve tester, and in an amplifier.

The winning bidder will be urged to visit promptly and have demonstrated before finalising the purchase.

The two valves tested at 30 and 32 negative volts respectively for 40 milliamps anode currents, a very close match.
These were very highly developed valves, made when the UK valve industry was working very well.