I found some 18C51 double triode made by LM Ericsson, but I cannot find any data about these tubes. On the other side of the original boexs there i stamped also RYC 22002 that appears not to be a data code, but rather a different designation.
They most probably are 2C51/W.E. 396A with different heater voltage, but I cannot find any data about Ef and If.
Ericsson was in contact with Western Electric years ago, and W.E. was also manufacturing the 407A, a 396A with Ef=20 V and If=0.1A, thus the 18C51 could be similar.
Can anybody help me?
They most probably are 2C51/W.E. 396A with different heater voltage, but I cannot find any data about Ef and If.
Ericsson was in contact with Western Electric years ago, and W.E. was also manufacturing the 407A, a 396A with Ef=20 V and If=0.1A, thus the 18C51 could be similar.
Can anybody help me?
Look under "18C51 Data sheet links". Looks the equivalent of a 12AT7 (different heater) or something though 😕
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