[Milsurplus] A Tube Puzzle

[Al Klase]

On 4/30/2012 5:02 PM, J. Forster wrote:
> Hi,
>
> My understanding was that standard tube conventions had the leading
> digit(s) as the filament voltage:
>
> 1B3   = 1 V
> 2X2   = 2 V
> 5Y3   = 5 V
> 6X5   = 6 V
> 12AX7 = 12 V
> 35W4  = 35 V
> 50C5  = 50 V
> 117L7 = 117 V
>
> etc.
Those comply with the Radio Manufacturers' Association (RMA) scheme 
introduced in 1934.
> How does a 2C51W dual triode fit in? It has a 6 V filament?
This is from the RMA 1942-1944 numbering system.

First digit is heater power, less than 10 watts. C = triode, 51 is a 
serial number.

See: http://en.wikipedia.org/wiki/RMA_tube_designation

Al
> -John
>
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-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/