Matched Pair RCA Cunningham 6K7 Vacuum Tubes Engraved Bottles NOS-Testing RCA 21LU8 NOS NIB but the bottle is firmly-cemented

but the bottle is firmly-cemented to it and there is no movement at all possible

ETSY DOES NOT HAVE A SYSTEM IN PLACE FOR THAT YET

Dynamic range is nice and it is a good-quality

This trio of US-made 6CM7 tubes was tested on our Paul Hart-calibrated TV7 for shorts

Matched Pair RCA Cunningham 6K7 Vacuum Tubes Engraved Bottles NOS-Testing RCA 21LU8 NOS NIB but the bottle is firmly-cementedThis new old stock testing, perfectly matched pair of RCA Cunningham 6K7 tubes were tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Both measured 56 were minimum (65%) is 36 and 100% is 55. These tubes have engraved bottles. 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