SKU:30710554031
Matched Pair National Union NU Number Type 37 #37 Vacuum Tubes Valves Black Plate Shoulder ST Shape NOS-Testing
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Ships within 48 hours · Estimated delivery Aug 13 - Aug 18
Description
Matched Pair National Union NU Number Type 37 #37 Vacuum Tubes Valves Black Plate Shoulder ST Shape NOS-TestingThis new old stock testing matched pair of National Union MANUFATURED Type 37 triodes was tested on our Paul Hart calibrated TV7 For shorts, gas and transconductance. There were no shorts or gas. They measured 36 and 37 (RCA LABELED, NU MANUFACTURED) 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
Transconductance measured 2500/2400 micromhos
new in box milspec Raytheon JAN-CRP-5676 tubes in this lot
It is not a 12AU7A
Source material is The Beatles "Yellow Submarine Songbook" and they sound terrific
IF YOU FEAR DAMAGE OR LOSS OF PARCEL IN TRANSIT
Matsushita-MANUFACTURED 12HL7 tubes tested to spec on our Paul Hart-calibrated TV7/U
new in box GE 33GY7A tubes tested to spec on our Paul Hart-calibrated TV7/U
This lot of two GE 25Z5 tubes were tested on our Paul Hart-calibrated TV7/U for emissions
35 and 42 where minimum (65%) is 26 and 100% is 40
gray plates and excellent flashing
8 milliamps while transconductance measured 2440 micromhos
where minimum (65%) is 36 and 100% is 55
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