3 US-Made Number Type 42 #42 Vacuum Tubes Lot Of Three

3 US-Made Number Type 42 #42 Vacuum Tubes Lot Of ThreeThis lot of three US made type 42 tubes was tested our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and they measured as follows: 58, 64 and 64 where minimum (65%) is 50 and 100% is 77. 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 OR CALL OR TEXT US AT 202 372 6931 IF YOU DO NOT SEE WHAT YOU NEED OR HAVE ANY

This lot of seven new old stock

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

bottom D getters and copper support rods

It’s a good pressing of a 1954 performance from right on the cusp of mono high fi

DB and CV batch codes

47 and 48 where minimum (65%) is 30 and 100% is 72

This lot of six GE 6AC7s was tested on our Paul Hart-calibrated TV7/U for shorts

new in box industrial-grade GE 6679 / 12AT7 dual triode was tested on my Hickok 600A for shorts

Transconductance measured 49/49 where minimum (65%) is 36/36

(New US-made 6BG6s typically test with plate current readings from the mid 20s to mid 50s with transconductance within a standard deviation of 2300 micromhos or so

(New 12AU7s typically test within one standard deviation of 2200 micromhos

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