SKU:789035470
Matched Pair RCA 12B4 12B4A Vacuum Tubes Black Plates Copper Support Rods NOS-Testing
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USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Aug 9 - Aug 14
Description
Matched Pair RCA 12B4 12B4A Vacuum Tubes Black Plates Copper Support Rods NOS-TestingThis new old stock testing matched pair of RCA 12B4A tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 43 while Tube Two measured 46 where minimum (65%) is 32 and 100% is 49. Wish I could tell you how they sound, but I don't have any equipment that uses these. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY
These tubes have large logos
They have gray plates
new in box Philco 6CS6 tested to spec on our Paul Hart-calibrated TV7/U
Tube Three (triode): 58
This RCA 807 output tube was tested with adapters on our Maxi-Matcher 2 for shorts
Transconductance measured 74/69 where minimum (65%) is 50/50
The dust jacket shows some wear
Its plate current draw was 25
but non-strident highs
They were made by Ken-Rad although one is branded "Crosley
This West German Amperex-MANUFACTURED
This Sylvania 12BF6 tube tested to spec on our Paul Hart-calibrated TV7/U
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