[TechAssist] Re: Any info on this old tube/ additional info
- From: "Hoyt's TV" <hoytstv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 30 Apr 2004 09:16:21 -0400
I used to repair Chrondek timers for New England Dragway. They had display
tubes that read out numbers. They were an odd (compared to radio & TV)
configuration, but I don't remember how many pins they had.
The early versions were about the size of a 6SN7 and had a series of dots
arranged in a circle at the top of the tube to line up with a number (0 to
9) painted on the case. The later ones read out actual numbers by having
internal grid wires shaped as a number, and were more the size of a 9 pin
miniature tube. Those read out from the side of the envelope. Of course both
they had to have more than 9 pins and probably would have had 11. They lit
up like a neon lamp. Had to have a wire grid for each one of the digits 0 to
9 plus the other pole to conduct to. That would add up to 11 pins.
Those were in use in 1968 and stayed until a new computerized system was
developed in the 80s, based on the 386 chips. One of the engineers who
worked for Chrondek, did a project on the design of a system with a direct
speed read out at about that time (68), for his masters thesis. The system
in use at the time simply read the elapsed time for a car passing through a
pair of beams 132 feet apart, that were situated 66 feet before and 66 feet
after the finish line. The timer operator then had to look up the reading on
a conversion chart to write the speed on the timing slip for the driver.
Russ Hoyt
Hoyt's TV
Exeter, NH
----- Original Message -----
From: <Royal19960@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, April 28, 2004 2:41 PM
Subject: [TechAssist] Any info on this old tube/ additional info
> Hi all, Thanks for all the responces and here is all the info I can
supply.
> Tube number is in a Sylvania box with a number os 13-27681-4
> Size is like a 6sn7
> Bakelite base with a key
> Has 11 pins
> made in 1968
> The words "red"" blue" are stamped on the base
> There is a visable grid on one side of the tube.
> Thats all I can offer in info. Thanks in advance
> Roy
> Roy Adams
> Bonded TV Service
> 5158 W Forest Home Ave
> Milwaukee, WI 53219
> 414-541-9111
> www.Bondedtv.com
> we have thousands of tubes on the site
> Webhosting from only 4.95 a month at Bondedhost.com
>
>
>
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