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(Best Overall Pair) M-4242A=242A Standard Electrica Spain NOS 1940's original boxes (116ma and 119ma) (FREE UPS EXPEDITED SHIPPING)

$ 1,999.99

1 PAIR with FREE UPS EXPEDITED SHIPPING 

M-4242A=242A Standard Electrica Spain NOS 1940's original boxes

Same build 4242A STC England

nickel bases - metal plate - "D" getters

4242A=242A Western Electric

similar to RS-237 Telefunken


Test Data

1 tube) 119ma Gm=4150

1 tube) 116ma Gm=4350

 

Good mA range 100-120ma

Good Gm = 3600-4000

 

Technical Data

4242A=242A:

Vplate=1000V max

Iplate=90ma max

Mu=12.5

Work best at 900Vplate and 55ma in SE amp

4242 will work in PP amp at 1100V and low plate current of 10-15ma


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