Telefunken ECH81 Vacuum Tube Valve Hytron Triple 3 Mica This new old stock-testing matched

This new old stock-testing matched pair of RCA 12B4 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

Transconductance measured 74 for Tube One and 76 for Tube Two where minimum (65%) is 58

They have black T plates

I have listened to it in my Bottlehead Crack headphone amplifier and it sounded great

Telefunken ECH81 Vacuum Tube Valve Hytron Triple 3 Mica This new old stock-testing matchedThis Telefunken ECH81 6AJ6 was tested on our Paul Hart calibrated TV7 for shorts, gas and transconductance. There were no shorts or gas. It measured 70 59 where minimum (65%) is 50 50 and has the Telefunken diamond (<>) embossed in its base. 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