[Milsurplus] A Tube Puzzle

[C.Whitaker]

de WB2CPN
Western Electric, (read AT&T), was heavy into proprietary
legalism.  I.E., in their carrier equipment the tubes were
tested regularily, and replaced when the Mu fell below a point,
or beyond the calendar time-out which was marked on the
tube.  The replacement date was marked on the new tube.
(WECo wrote the book on Statistic Quality Control.)
The old tube was destroyed in a "Tube Crusher", a heavy
metal bucket with a thing like a heavy potato masher in it.
Some of you may know what a "churn" country people
used to make buttermilk looks like.
Naturally, they had their system for naming tubes.
Ex-Long Lines person.
73  Clete
+++++++++++++++++++++++++++++++++++++++




On 4/30/2012 8:32 PM, Bruce Gentry wrote:
> 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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