Matched Pair RCA Radiotron 805 Vacuum Output Tubes Valves NOS-Testing

Matched Pair RCA Radiotron 805 Vacuum Output Tubes Valves NOS-TestingThis new old stock testing matched pair of RCA Radiotron 805 output triodes was tested on our Paul Hart calibrated TV7 U with 180 volts on the plates and a bias of 0 volts for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 52 for Tube One and 56 for Tube Two where minimum (65%) is 30 and 100% is 46. These tubes have mediocre to fair and nice flashing, respectively; matching 1 39 date codes; D getters and

There are five Sylvania 6N7 / 6N7 GT tubes in this lot

This lot of three RCA-Victor gray glass 50L6GT tubes was tested on our Paul Hart-calibrated TV7/U for shorts

Transconductance measured (From left to right): 36

They are dead quiet when the SACD player is muted but are not recommended for this amp -- which was designed for 6SN7s -- as they not only break up early

excellent flashing and an O getter

new in box Raytheon 6AE6G tubes tested to spec on our Paul Hart-calibrated TV7/U

Both have 939 date codes

The dust jacket shows some wear

new in box RCA 12DQ6A tube tested to spec on our Paul Hart-calibrated TV7/U

(New US-made 7C5s typically test with plate current from the mid teens to mid 30s with transconductance from 2300 micromhos or so

It measured 38 in its triode section where minimum (65%) is 25 and 100% is 39

new in box matched pair of Hytron 1622 tubes was tested on our Paul Hart-calibrated TV7/U for shorts