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(2 pairs in stock March) M-4242A=242A Standard Electrica Spain NOS 1940's original boxes

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

Same build 4242A STC England

nickel base and metal plate

4242A=242A Western Electric

similar to RS-237 Telefunken

 

Test Data


 

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


See more: vacuum tube
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