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 Post subject: Help identify this tube tester?
PostPosted: Aug Tue 09, 2011 4:27 am 
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Location: Oskaloosa, KS
I recently was given this tube tester. I do not know anything about it other then is has stamped on the panel Model# 712-A and Serial # 30180. On the gauges are marked “Triplet” and “Readrite”. Is this worth bring back to life, any idea on how to use it?

Thanks

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 Post subject: Re: Help identify this tube tester?
PostPosted: Aug Tue 09, 2011 5:35 am 
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I don't think that's a tube tester. It is a set tester.


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 Post subject: Re: Help identify this tube tester?
PostPosted: Aug Tue 09, 2011 11:44 am 
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Aparently a National Schools (Los Angeles-CA) SC-101 Model. year 1941


Last edited by ariston on Aug Tue 09, 2011 8:25 pm, edited 2 times in total.

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 Post subject: Re: Help identify this tube tester?
PostPosted: Aug Tue 09, 2011 2:16 pm 
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Location: Pocasset, Cape Cod, MA
It's a set analyzer from around 1935, for measuring voltages and currents in a radio set. To use it, you pull a tube from the radio, plug it into the analyzer, and plug the analyzer cable into the radio using the proper adapter. Then you can use the meters to measure each stage.

These things were popular in the early 1930s when many servicemen didn't understand troubleshooting, but would make a list of all voltages and currents for comparison with pre-printed charts supplied by the analyzer maker or in the Rider manual. They went out of use when radios became less forgiving of running RF tubes at the ends of long cables. They're nice to look at, but of no value in radio repair now.


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 Post subject: Re: Help identify this tube tester?
PostPosted: Aug Tue 09, 2011 4:44 pm 
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Location: Oswego, NY, USA
Roughly 1933 to 1935, according to Mom (she worked in Triplett shipping dept thru the 1930's w/ Blanche Triplett, Ray's sister in-law) was when they changed from the Readrite over to the (Norman Triplett designed) curved top Triplett logo, so the two meters are probably original. Did you check it against the pictures and descriptions shown on Steven Johnson's website? I have an original "Readrite" hand-painted 36" X 14" wooden sign that used to hang in the factory.

Fred


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 Post subject: Re: Help identify this tube tester?
PostPosted: Aug Tue 09, 2011 7:38 pm 
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ariston wrote:
Aparently a National Scoul (Los Angeles-CA) SC-101 Model. year 1941


It's an earlier Triplett as mentioned in the posts above. If I had to guess I'd say around 1932-1934. This style of set tester with the cable was all but gone by 1940.
If it was later than 1935 it would most likely have more tube sockets.

I'd go by what Freds mom said.

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 Post subject: Re: Help identify this tube tester?
PostPosted: Aug Tue 09, 2011 8:25 pm 
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See picture labeling:
Can be made by Triplette


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 Post subject: Re: Help identify this tube tester?
PostPosted: Aug Tue 09, 2011 8:44 pm 
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That one's in nice shape. Definitely manufactured by Triplett. It's 1935 or earlier.

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 Post subject: Re: Help identify this tube tester?
PostPosted: Aug Tue 09, 2011 9:15 pm 
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It is a readrite model 712A. I have a couple of them. In addition to selling instruments directly, triplett and readrite manufactured their instruments for many other companies and technical schools and put the label of the company (e.g., national union, NRI) which purchased these instruments for resale.


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 Post subject: Re: Help identify this tube tester?
PostPosted: Aug Wed 10, 2011 1:04 am 
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Location: Pocasset, Cape Cod, MA
I was basing my date on the octal adapter I think I see in the photo.

Now that's interesting about using Readrite and then Triplett. I had just assumed Readrite was a cheaper name they put on stuff.


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 Post subject: Re: Help identify this tube tester?
PostPosted: Aug Wed 10, 2011 5:08 am 
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Location: Oskaloosa, KS
Thanks for the info. Glad I asked, otherwise I would have told anyone who asked that it was a tube tester, which used the radio as a power source. I am just now starting to go through about four pickup truck loads of radios, tubes and misc parts; I received while helping to clean out a friend grandfather’s basement. I was told he was a radio collector and HAM operator for about 60 years. To date I have counted 144 radios, several pieces of testing equipment, and few phonographs. With all that i have about 50 boxes and large popcorn tins full of tubes and parts.

I know I will be posting many more "What the heck is this" questions in the future.

Thanks

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