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Old 17th November 2004, 09:48 PM   #1
massimo is offline massimo  Italy
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Default 18C51 tube help!

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?
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Old 18th November 2004, 05:39 AM   #2
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http://tdsl.duncanamps.com/show.php?des=18C51

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Old 18th November 2004, 05:51 AM   #3
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Hi,

Geek,

That's no good : no If/Vf data.

The Chelmer Valve Company in the UK seems to carry some. Maybe they have a copy of a datasheet of the 18C51.

CVC

Cheers,
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Old 18th November 2004, 05:59 AM   #4
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Look under "18C51 Data sheet links". Looks the equivalent of a 12AT7 (different heater) or something though
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Old 18th November 2004, 07:09 PM   #5
massimo is offline massimo  Italy
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Mistery solved!

Ef = 18.9 V If = 0.1 A

Thank you folks for your replies!
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