• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

2C52 datasheet

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I had over 100,000 tubes at one time. Most were military surplus. I have never seen a 2C52, but I do have several "specials" that fit the description.

Google found this:

Base Octal (Int.Octal, IO) K8A, USA 1935
Filament Vf 12.6 Volts / If: 0.3 Ampere / -: Indirect /
Description High-mu double triode. Mu 100. Designed for aircraft servo-amplifiers.
GE, Raytheon and Sylvania among known manufacturers.
Tube prices 0 Tube prices (visible for members only)
Literature Essential Characteristics, GE 1973
- - Manufacturers Literature
Tube Lore, Sibley, USA 1996


Google also found several 2C52's for sale.
 
Thanks for the inputs, yes 2C52 is 8BD, same pinout as 6SL7/ECC35, 12SL7, etc. mu=90

It will be used in a diy project with two tubes connected in SRPP so if someone knows what is the filament-cathode limit..

Maybe 90V like a 12SL7 :confused:
 

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