1958 MULLARD RX1 EL84 6BQ5 Quad Tubes Blackburn UK

Description

Quad of 1958 RX1 MULLARD EL84 6BQ5 Quad Tubes, Blackburn UK.
Codes are RX1 B8H RX1 B8H RX1 B8H RX1 B8I
3 of these have the same exact code of B8H one of which has D getter and the other are O getter.
B8I tube is O getter.
Test 7500, 8200, 8700, 9000 for transconductance where 5650 is good
on a Hickok 539-B calibrated by Paul Hart.
Cannot guarantee what they will test in another tester or in your gear at *** plate voltage.
All tubes are guaranteed good working for audio/hi-fi only (not warrantied in guitar amps) or may be returned.
Please see our other items for more vintage tubes & audio.
We combine orders for shipping.
We don't change values for customs.
Thank You.