Vintage Pair of Telefunken 12AT7 ECC81 Vacuum Tubes <> Harman Kardon

Description

Pair of Telefunken 12AT7 ECC81 Vacuum Tubes <> Harman Kardon
🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼🎼
**** Tested on our  proprietary  tester , the E3444.
It's a Triplett 3444 that has been enhanced.
This tester uses regulated power sources for the bias, plate, & screen voltages, as well as modified operating & testing procedures.
Filament voltage is also controlled.
Tubes are tested in accordance with the manufacturer's specifications; measurements closely align with a laboratory tester built to rigorously measure vacuum tube characteristics.
Tubes can be accurately matched for gm & plate current at the manufacturer's specified test points or at other specified test points.
***** This tester was prepared by Mr. Paul Hart of Roswell, GA
*********************************************************************
Industry Bogey transconductance  = 5500|5500 µmhos
Industry Bogey plate current   =  11.0|11.0mA
Results =
3700/4650
µmhos ~ 7.7/8.6mA
4250/4425uhmos ~ 8.0/8.5mA
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
USA Shipping 
I have many other types of tubes  Please Search My Store  ~~~   No Additional Shipping Charges
All tubes Guaranteed
♪♪♫♫♫♫
Thank You!
♫♫♫♫♪♪
~~~~  Please click on the link below to view more items in my store.  ~~~~~~~~
GreenGirl's Guaranteed VintageTubes
ov#8