SKU:78148719742
National Union NU 807 JAN-CNU-807 Vacuum Tube Milspec
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Ships within 48 hours · Estimated delivery Sep 28 - Oct 3
Description
National Union NU 807 JAN-CNU-807 Vacuum Tube MilspecThis new old stock TESTING National Union 807 output tube was tested on our Maxi Matcher 2 for shorts, gas and transconductance with 400 volts on the plates and a bias of 48 volts. There were no shorts or gas. Plate current draw was 20 milliamps while transconductance measured 2450 micromhos. (New 807s typically test from the mid teens to mid 30s with transconductance from 2200 micromhos). I am playing it now in my Musical Paradise 301 MK 3 (with an
These matched quad of RCA milspec JRC-6H6 / 6H6 / VT-90 6H6 tubes was tested on our Paul Hart-calibrated TV7/U
Transconductance readings are 46
an O-getter
well-constructed tubes with Micanol bases
Tube One measured 76/74 while Tube Two (GE-MANUFACTURED
They have 56-26 188-4 and 61-26 188-4 date/provenance codes
This matched pair of GE 12B4A tubes was tested on our Paul Hart-calibrated TV7/U for shorts
Transconductance measured 48/46 for Tube One and 50/48 for Tube Two where minimum (65%) is 32/32
new in box GE 50GY7 tube tested to spec on our on our Jackson 648
49 and 49 where minimum (65%) is 30 and 100% is 47
Transconductance readings are indicated on the tops of the tubes
Tube Two (triode): 32
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