[ARC5] Old Navy Tube Numbers

[Richard Knoppow]

----- Original Message ----- 
From: "jmfranke" <jmfranke at cox.net>
To: "Roy Morgan" <k1lky at earthlink.net>; "ARC-5 List" 
<arc5 at mailman.qth.net>
Sent: Monday, November 12, 2012 6:15 AM
Subject: Re: [ARC5] Old Navy Tube Numbers


> 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
>
     My first impression was the above, simply that the last 
digits indicated the conventional tube number, however, I 
could not find the type 64 tube anywhere. I have several old 
tube manuals, both physical books and PDF but this is seems 
an odd tube. From the diagram its a receiving type triode. 
Does anyone have more information or know of a source for 
more?


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com