The E2657 is an M-OV experimental valve and has a serial number of 20 The construction suggests a low power EHT rectifier. The anode connects to the top cap.
Testing our other E2657 reveals a 6.3 Volt heater.
The white band shields the gap between cathode screen and the anode.
The thin glass tube envelope is 21 mm in diameter, and excluding the base pins is 63 mm tall.
Absolute Maximum Operating Conditions¶
Updated March 04, 2013. shape:thin.glass.tube construction:all.glass type:rectifier.hw age:1940.1950 base:b9a heater:6.3v pins:9 pin:1.k pin:2.h pin:3.- pin:4.k pin:5.h pin:6.k pin:7.- pin:8.h pin:9.h.k pin:tc.a