[Milsurplus] Tube Nomenclature Questions

[Al Klase]

Don't know if any of it is rational. The S actually stands for 
single-ended as opposed to grid cap, and yes some clever internal 
shielding was need to do this. The orignal octals were metal tubes such 
as 6K7, 6J7, 6R7, etc. The the single-ended equivalents were 6SK7, 6SJ7, 
6SR7, etc. That's not at all consistent. A 6SL7 is not a single-ended 6L7.

Al

On 5/30/2011 11:27 PM, J. Forster wrote:
> Thanks very much.
>
> I never knew the letters and number after the filament voltage meant
> anything rational.
>
> Best,
>
> -John
>
> ===============
>
>
>> John:
>>
>> J  Joint
>> A  Army
>> N  Navy
>>
>> C
>> R
>> C  RCA
>>
>> 6  6 volts
>> S  Shielded design octal
>> K  Serial letter Random assigned
>> 7  Number of active elements
>> Y  Micanol base
>> Absence of G, GT indicates metal envelope
>>   W  here means ruggedized
>>   A, B, etc. here are design improvements, usually backward but not always
>> forward compatible.
>>
>> Robert has the complete manufacturer list.  And it is in many TMs, as well
>> as somewhere on the Internet, but I haven't looked at it lately, so I
>> don't have a URL.
>>
>> The other information is in the old RCA, GE, etc. tube manuals
>>
>> HTH
>> W5VPQ
>>
>> ---------- Original Message ----------
>> From: "J. Forster"<jfor at quik.com>
>> To: ARC5 at mailman.qth.net, milsurplus at mailman.qth.net
>> Subject: [Milsurplus] Tube Nomenclature Questions
>> Date: Mon, 30 May 2011 19:20:27 -0700 (PDT)
>>
>> Hi,
>>
>> I'm somewhat ignorant about tube nomenclature. Consider:
>>
>> JAN CRC 6SK7Y
>>
>> Is the CRC the Navy Manufacturer's code? Does anybody have a table of the
>> common ones?
>>
>> Also, is there some reference for the suffix letters ( I know what GT and
>> G mean, but what about the other possible letters)
>>
>>
>> Thanks,
>>
>> -John
>>
>> =================
>>
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>
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-- 
Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/