4 X 12SL7GT ULTRON TUBE. GE PROD. SILVER PLATES. 2 MATCHED PAIRS. CO ENA

4 X 12SL7GT TUBE. NEW OLD STOCK IN ORIGINAL BOX.

BRAND: ULTRON. GE PRODUCTION

SILVER PLATES, FLAT GETTER

TESTED IN AMPLITREX AT1000 TUBE TESTER 

MATCHED PAIR 1

121/113% EMISSION (EM) 112/106% TRANSCONDUCTANCE (GM) 1.6/1.8mA GAS 

121/108% EMISSION (EM) 112/100% TRANSCONDUCTANCE (GM) 0.5/1.6mA GAS 

MATCHED PAIR 2

95/108% EMISSION (EM) 87/106% TRANSCONDUCTANCE (GM) 0.6/0.5mA GAS 

104/104% EMISSION (EM) 93/93% TRANSCONDUCTANCE (GM) 0.4/0.6mA GAS