[ARC5] Old Navy Tube Numbers

Mon Nov 12 18:19:55 EST 2012

I wasnt referring to you John...just the other one who always wants freebies 
altho he can well afford things.

They show up in the $20-25 range at times which certainly isnt outrageous, 
thats about what they sold for new.

----- Original Message ----- 
From: "jmfranke" <jmfranke at cox.net>
To: "Geoff" <geoffrey at jeremy.mv.com>; <jfor at quikus.com>
Cc: "ARC-5 List" <arc5 at mailman.qth.net>; "Roy Morgan" <k1lky at earthlink.net>
Sent: Monday, November 12, 2012 5:41 PM
Subject: Re: [ARC5] Old Navy Tube Numbers

> Absolutely not!! At most I would make one or two pages available for 
> research purposes (in accordance with Title 17) as I said in a previous 
> email. I also pointed interested persons to a web site where a 
> non-copyrighted government document is available which contains most of 
> the information. I have my own bought and paid for edition of "Tube Lore." 
> No one suggested distributing copies of a protected work. Why would you 
> suggest such a terrible act?
>
> John  WA4WDL
>
> --------------------------------------------------
> From: "Geoff" <geoffrey at jeremy.mv.com>
> Sent: Monday, November 12, 2012 5:28 PM
> To: <jfor at quikus.com>; "jmfranke" <jmfranke at cox.net>
> Cc: "ARC-5 List" <arc5 at mailman.qth.net>; "Roy Morgan" 
> <k1lky at earthlink.net>
> Subject: Re: [ARC5] Old Navy Tube Numbers
>
>> Its copyrighted 1996, I dont believe you are suggesting doing something 
>> illegal?
>>
>>
>> ----- Original Message ----- 
>> From: "J. Forster" <jfor at quikus.com>
>> To: "jmfranke" <jmfranke at cox.net>
>> Cc: "ARC-5 List" <arc5 at mailman.qth.net>; "Roy Morgan" 
>> <k1lky at earthlink.net>
>> Sent: Monday, November 12, 2012 9:49 AM
>> Subject: Re: [ARC5] Old Navy Tube Numbers
>>
>>
>>> Is Tube Lore available anywhere as a .pdf (preferably free)? The HC 
>>> seems
>>> pretty expensive.
>>>
>>> -John
>>>
>>> ============
>>>
>>>
>>>
>>>> Yes, see pages 129 and 130 of "Tube Lore" by Ludwell Sibley.  For many
>>>> tubes, like the type 80,  381 or 382 was added to the two digit
>>>> designation:
>>>>
>>>> 80 = 38180
>>>> 19 = 38019
>>>> 39 = 38039
>>>>
>>>> For Some other tubes such as 6C6, 6D6, and 6F7, 38 was added and the
>>>> letter
>>>> was replaced with the alphabetical number for the letter, for example:
>>>>
>>>> 6C6 = 38636 - C is the third letter in the alphabet
>>>> 6D6 = 38646 - D is the fourth letter in the alphabet
>>>> 6F7 = 38667 - F is the sixth letter in the alphabet
>>>> 2A3 = 38213 - A is the first letter in the alphabet
>>>>
>>>> For some three digit tubes we see:
>>>>
>>>> 803 = 38803
>>>> 807 = 38807
>>>> 837 = 38837
>>>> 955 = 38955
>>>>
>>>> And there are other schemes as well.
>>>>
>>>> John  WA4WDL
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> --------------------------------------------------
>>>> From: "Roy Morgan" <k1lky at earthlink.net>
>>>> Sent: Sunday, November 11, 2012 9:55 PM
>>>> To: "ARC-5 List" <arc5 at mailman.qth.net>
>>>> Subject: [ARC5] Old Navy Tube Numbers
>>>>
>>>>> Arc-5 folks,
>>>>>
>>>>> A fellow in Canada has just got two RBC's and an RAB power supply.
>>>>> The schematic I find for the power supply
>>>>> (at: http://www.skywaves.ar88.net/commrx/RCA/RAB/RAB_schematic.gif )
>>>>> has the old navy numbers for tubes - I am guessing that 38180 means
>>>>> type 80 rectifier.
>>>>>
>>>>> Is there a cross reference list of these old 1930's tube types?  My
>>>>> tube notes includes only this message on the topic (I just added the
>>>>> 38180 entry):
>>>>>
>>>>> Roy
>>>>>
>>>>>
>>>>> Date: Mon, 14 Jul 2003 13:01:04 -0400
>>>>> To: glowbugs <glowbugs at piobaire.mines.uidaho.edu>
>>>>> From: "John M. Franke" <j.m.franke at larc.nasa.gov>
>>>>> Subject: GB> 38XXX series tube numbers
>>>>> Sender: owner-glowbugs at piobaire.mines.uidaho.edu
>>>>>
>>>>> Those 38XXX series tube numbers.
>>>>>
>>>>> While trying to get a US Navy military surplus RU-17 receiver working,
>>>>> I ran across some strange tube designations.  The final audio output
>>>>> tube is a 38233, which I had never heard of.  Searches for information
>>>>> seemed fruitless.  Then, scanning the manual for another US Navy
>>>>> military surplus receiver, a DZ-2, I saw a pattern.  The 1939 manual
>>>>> implied that the 38XXX system was a "Former Navy Type" designation.  I
>>>>> observed that the first two digits, 38, was used to designate the item
>>>>> as being a vacuum tube (see:
>>>>> http://www.designation-systems.net/usmilav/electronics.html#_EarlyNavy
>>>>>  orhttp://www.maritime.org/wish-mote.htm).  The last three digits are
>>>>> either the commercial tube designation or a coded version of the
>>>>> commercial designation.  If the first of the three digits is a "0",
>>>>> the following two digits are the commercial designation.  For example,
>>>>> a 38041 is the same as a type 41 vacuum tube and a 38076 is a type
>>>>> 76.  For other tubes, like a 38636, the two sixes are retained and the
>>>>> second digit is replaced with the corresponding letter.  In this case,
>>>>> the third letter in the alphabet is a "C", so a type 38636 tube is
>>>>> actually a 6C6.  A 38646 is a 6D6 and so on.  A short list of tube
>>>>> numbers I have translated is presented below.  Of course, the system
>>>>> did not work for the specific tube I was seeking, but it does seem to
>>>>> work for others.  Is the alignment I discovered real or happenstance?
>>>>> Does anyone else have a clue or reference for the 38XXX numbering
>>>>> system?
>>>>>
>>>>> 38041 41
>>>>> 38076 76
>>>>> 38111A         CW211C
>>>>> 38142 2C45, 45 Special
>>>>> 38145 845
>>>>> 38166 866
>>>>> 38180           80 rectifier most likely
>>>>> 38233 2C21/1642
>>>>> 38636 6C6
>>>>> 38646 6D6
>>>>> 38808 808
>>>>>
>>>>> Sincerely,  John  WA4WDL
>>>>>
>>>>>
>>>>> Roy Morgan
>>>>> k1lky at earthlink.net
>>>>> K1LKY Since 1958 - Keep 'em Glowing!
>>>>>
>>>>>
>>>>>
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>>
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