[R-390] TJ311M01 sighting at Shelby

[Mahlon Haunschild]

I quote:

3Z6925-19.3
1 EACH
RESISTOR, CURRENT
REGULATING
TJ311Mo1                 (NOTE: yes, that's a little "owe" not a "zero")
11412-P-54-59 (51)
MFG BY VICTOREEN INST.CO.
DATE PKD : 3/56

Apparently this was a US Army contract; the tubes are lettered "US ARMY" 
as well.

I'm guessing here, but it seems to me that the usage of the little "owe" 
was to denote a "zero" whereas an upper case "owe" would denote an 
actual "owe".

Cold DC resistance:  12.4  / 12.6 ohms

regards,

Mahlon - K4OQ

eldim at att.net wrote:

> Hello Mahlon and group members,
> 
> This is indeed a surprise and maybe a new thread that requires futhur 
> investigation.  This Part Number #TJ311M01 is listed  in the R-390A/URR 
> Operators Manual TM11-5820-358-10, Dated 16 Jan 1961 on the pictorial 
> page showing the spares and accessories (FIG-5). The FEDLOG crosses this 
> part to the 3TF7  (RT510) which is the Ballast Tube or the official name 
> "RESISTOR, CURRENT REGULATING", that is most commonly identified and 
> found in the R-390A IF Deck. TM'S 11-5820-358-20P, Dec 77, and -34P , 
> Dec 77, both show RT-510 with the same federal stock number of 
> 5905-681-4707 and the Part Number SMB283222.  The military SMb Part 
> Number would most likely ONLY show up on the military packaged product 
> and not on the part. The question that I have is "WHEN WAS THE FIRST 
> R-390A/URR MANUFACTURED". The -10 TM shows that the 16 Jan 61 TM 
> supersedes so much of TM 11-856A, 20 Jan 1956 plus Change 1, 2,3,4, 
> 5,and 6 as pertains to the operation of the equipment.  Was this the TM 
> for the R-390?
> 
> Victoreen  is well know for their sub-miniature HV vacuum tubes, 
> extremely hi-resistance glass resistors, and their radiation detection 
> equipment.  Now there appears a BALLAST with their name?  Could it be 
> that this was short lived because  AMPERITE had the  patent rights or 
> did VICTOREEN have it and then pass it over to AMPERITE? 
> 
> The question to Mahlon is "What is the information that is printed on 
> the box of these tubes?". Is there a Date Code on the Box? And if you 
> have a DVM, what is the resistance in ohms across the element?
> 
>  
> 
> A HAPPY LABOR DAY TO ALL!
> 
> 73,
> 
> Glen Galati, KA7BOJ
> 
> Tacoma, WA
> 
>     -------------- Original message from Mahlon Haunschild : --------------
> 
>      > Hello, list.
>      >
>      > At Shelby this weekend a tube-head in the flea market forced me to
>      > purchase a pair of TJ311M01s from him for $5 the pair (yes, that's
>      > right, $5). As most of us know, the TJ311M01 is essentially the
>     same as
>      > the 3TF7.
>      >
>      > Just wanted to note here that these particular examples were made by
>      > Victoreen in 3/56, so it seems that there were other
>     sources/production
>      > lots made other than Amperite in 1978 (as one source has noted).
>      >
>      > Just so you know.
>      >
>      > regards,
>      >
>      > Mahlon - K4OQ