3 RCA Number Type 37 #37 Vacuum Tubes Valves Black Plate ST Shape Lot Of Three London International The spine is in fine

The spine is in fine shape with no loose pages and the dust jacket has only a few

copper support rods and excellent flashing

they can put out as much as 2A3s and fell into disfavor because of socket supply issues

These seven new old stock

They have 4-39 188-5 and 3-43 188-5 date codes/EIA code

3 RCA Number Type 37 #37 Vacuum Tubes Valves Black Plate ST Shape Lot Of Three London International The spine is in fineThese three RCA Type 37 triodes were tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. They measured 23, 31 and 39 where minimum (65%) is 23. They have black plates; dimpled sheet getters; old fashioned, coke bottle shape glass envelopes and terrific flashing. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND