Vintage Tungsram Harman Kardon 12AU7 ECC82 Vacuum Tube 1660/1790 Balanced

Description

Tungsram Harman Kardon 12AU7 ECC82 Vacuum Tube
***** Tested on our new proprietary  tester , the E3444 Triplett.
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 = 2200/2200
µ
mhos
Industry Bogey plate current = 10.0/10.0mA
Results =
1660/1790
µ
mhos  ~  8.0/8.7mA
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USA
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