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  #16  
Old 02-22-2013, 07:43 PM
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Zenith6S321 Zenith6S321 is offline
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Yes it would be nice to collectively put together a database to make the tester more useful for all. I took a look at the 121 schematic, but I doubt there is enough information to try to reverse engineer it and come up with card designs from tube specifications.

Dave
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  #17  
Old 02-22-2013, 09:19 PM
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Quote:
Originally Posted by Zenith6S321 View Post
Yes it would be nice to collectively put together a database to make the tester more useful for all. I took a look at the 121 schematic, but I doubt there is enough information to try to reverse engineer it and come up with card designs from tube specifications.

Dave

Not sure about the 121, but you can develop your own test cards for the 123 and 1234, and the different variations on these, including the military AN/USM-118. I have the Western Electric variant (KS-15874-L2), and the instruction manual has explicit instructions on how to make up a custom test card given a basing diagram and basic tube specifications. Mine came with a good supply of the blank cards and the hole punch.

I don't have the "full" set of test cards, but most of the ones that I am missing are the "later" types, mostly series string stuff.
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  #18  
Old 03-06-2013, 11:44 AM
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I just picked up about 140 more cards for the 121. Mostly series string stuff in the 2-5 filament volt range. That's cool because I mostly do TV tube testing, but I'd really like the 6 volt cards too. Luckily, I do have some overlap like a 5BR8 / 6BR8 or 3CB6 / 6CB6. There only seems to be a two hole difference between them. I figure I can use those like a Rosetta stone to decode the filament holes.
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  #19  
Old 03-06-2013, 07:15 PM
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Zenith6S321 Zenith6S321 is offline
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I took a shot at trying to figure out the correspondence between the punched holes and their function. Maybe what it did before I quit will help you some. Attached are PDFs of four pages of the punch card switches and their function.

Dave

Last edited by Zenith6S321; 02-22-2015 at 06:52 PM.
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  #20  
Old 03-06-2013, 07:16 PM
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And here is the 121 schematic.

Dave

Last edited by Zenith6S321; 02-22-2015 at 06:52 PM.
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  #21  
Old 03-06-2013, 09:33 PM
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Thanks for the info Dave.

Here's what I've figured out so far by comparing cards to the schematic. I think you were off by one with your FIL1 & FIL2 chart,

Filament voltage

A9 - K9 = 0.1's
B11 - K11 = 1's
A16 - G16 = 10s

2BN4 - H11 (2) + G9 (0.3) = 2.3 v
3BN4 - H11 (2) + A9 (0.9) = 2.9 v
3CB6 - A11, D11 (3) + J9 (0.1) = 3.1 v (this one is a bit odd, why not use H11 + J9 ?)
4CB6 - F11 (4) + H9 (0.2) = 4.2 v
6CB6 - D11 (6) + G9 (0.3) = 6.3 v
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Last edited by bandersen; 03-06-2013 at 09:38 PM.
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  #22  
Old 03-07-2013, 09:52 AM
dieseljeep dieseljeep is offline
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I picked up an RCA, card type tube checker, for a buck.
It's novel, but kind of a useless piece. Some of the cards were home-punched. A lot of the tubes, I normally use, I don't have a card for. Plus, it only has four sockets, Octal, loctal, seven pin and nine pin.
Built really well, but just a novelty, at best.
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  #23  
Old 03-07-2013, 11:52 AM
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Is it a WT-110A ? It's actually a pretty good tester. Like the Hickok, it uses mutual conductance. Here's one that sold for $250.

http://www.ebay.com/itm/RCA-WT-110A-...-/150999237542
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  #24  
Old 03-07-2013, 01:30 PM
dieseljeep dieseljeep is offline
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Originally Posted by bandersen View Post
Is it a WT-110A ? It's actually a pretty good tester. Like the Hickok, it uses mutual conductance. Here's one that sold for $250.

http://www.ebay.com/itm/RCA-WT-110A-...-/150999237542
I have to look at it again! The one shown, has a lot more cards. No other pictures available.
When testing it out, I thought it was better than the simple emissions testers. It's an interesting piece, to be sure.
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  #25  
Old 05-15-2013, 09:48 AM
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walter2 walter2 is offline
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Exclamation Have Cardmatic 121 Cards

I am new to this group, but also a 121 Cardmatic owner (plus many other tube testers), and mine seems to have a very large card inventory (takes several boxes to hold them all). My main interest is industrial and audio tubes, not TV tubes, so if anybody needs a specific card, I am happy to search for it, and send you the details, or the card if it's not one I require. Anybody got a full manual PDF available?

all the best,
walter
sphere research corp.
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  #26  
Old 05-15-2013, 05:29 PM
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Hi Walter. Welcome to Videokarma

I could be persuaded to scan my manual in exchange from some cards scans or details.

I'll try to come up with some TV tubes I need cards for, but in the meantime I'd love to get some more early radio tubes like: 24A, 27, 37, 30/44, 42, 45, 47, 71A, 75, 78.
I think that would cover all my late 20s - mid 30s radios.
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