Mullard ME1400 CV432 EF37A, NOS NIB, same codes, perfect, special quality

Mullard ME1400 CV432 EF37A, NOS NIB, same codes, perfect, special quality
Mullard ME1400 CV432 EF37A, NOS NIB, same codes, perfect, special quality
Mullard ME1400 CV432 EF37A, NOS NIB, same codes, perfect, special quality

Mullard ME1400 CV432 EF37A, NOS NIB, same codes, perfect, special quality

For sale matched pair Mullard ME1400 CV432 EF37A. The ME1400 is an electrometer pentode for use in high resistance circuits for such applications as PH meters, photocell units and valve voltmeters. The input current into g1 is of the order of 10 to the -11 Amps.

The maximum anode voltage is 90 Volts and the maximum cathode current is 1.0? Gerry Horrox of Crowthorne Tubes has provided information that the special quality ME1400 was developed from the EF37A and in addition to its specific design use as an electrometer pentode it functions well in studio audio equipment where it would be running at 6.3 Volt on the heater and up to 250 Volt on the anode. Edition 20 of the AVO manual gives the heater as 6.3 Volt.

The second set of operating conditions reflects this audio use the first set are from the original Mullard data. PRICE IS FOR TWO TUBES (ONE PAIR). I will pack and secure tubes good. Feel free to contact me.
Mullard ME1400 CV432 EF37A, NOS NIB, same codes, perfect, special quality