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Old 5th October 2010, 09:08 PM   #1
6J7 is offline 6J7
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Default 2C52 datasheet


Does anyone has a complete datasheet of the 2C52 tube ?
I searched but found nothing, just an incomplete Raytheon document.

Thank you
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Old 5th October 2010, 11:15 PM   #2
jlsem is offline jlsem  United States
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I believe it is a 12.6V only version of the 12AX7.

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Old 12th October 2010, 10:55 PM   #3
ke4mcl is offline ke4mcl  United States
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Default 2c52

i have one in front of me and its no 12ax7. its an octal, very similar in appearance to a round plate 12SL7. i have over 8k tubes and the two i recently got are the first i have seen. i too am searching for data on it.
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Old 13th October 2010, 01:31 AM   #4
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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.
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
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Old 13th October 2010, 01:41 AM   #5
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Tube Lore says base is 8BD (same as 6SL7). Close to a 12SL7.
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Old 13th October 2010, 11:41 AM   #6
6J7 is offline 6J7
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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
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Old 19th January 2011, 07:53 PM   #7
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Specs similar to 12AX7, but in octal package as has been noted. I have a bunch of these, may try them in place of 12AX7s in a couple preamp projects. The links below show slightly different specs - some are the same.

http://tdsl.duncanamps.com/pdf/vm345.pdf (shows same as 12AX7, mu = 100)

http://www.wps.com/archives/tube-dat...-56-40M/12.JPG (shows mu = 90)

Last edited by jewel942; 19th January 2011 at 08:17 PM.
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