[Milsurplus] A Tube Puzzle
Bruce Gentry
ka2ivy at verizon.net
Mon Apr 30 20:32:38 EDT 2012
The tube numbers you used at the top of the list are standards
established by the RMA radio manufacturer's association which later
became the RETMA radio electronics and television manufacturing
association. Industrial and special purpose tune follow a totally
different system. There can be surprises, sometimes one manufacturer's
number is equivalent for others and often it is not. I think the 2C51 is
a Western Electric design, and their tube numbers did not follow anyone
else's
Bruce Gentry KA2IVY.
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.
>
> How does a 2C51W dual triode fit in? It has a 6 V filament?
>
> -John
>
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