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 Post subject: Jackson 648A tube adapters
PostPosted: Jun Mon 03, 2019 7:18 pm 
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Location: Bay City Mi
I like my Jackson 648A, but it will not test the large 9 pin or I guess they call them Novar base tubes... is there a adapter for these , or can one be fabricated for the 648A?
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 Post subject: Re: Jackson 648A tube adapters
PostPosted: Jun Mon 03, 2019 8:16 pm 
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duplicate deleted

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Last edited by Barry H Bennett on Jun Mon 03, 2019 8:17 pm, edited 1 time in total.

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 Post subject: Re: Jackson 648A tube adapters
PostPosted: Jun Mon 03, 2019 8:17 pm 
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Location: Sunbury, Ohio 43074
If your tube tester has a 9 pin socket of any kind, you can make an adapter for some other 9 pin (or less) socket with no electrical problem, as long as the tube you are trying to test does not exceed the tester's ability to provide the proper voltages and currents for your tube.

However, you'll need to see if someone has, or if Jackson has, the tube setup data for that tube on your tester. Or you might be able to figure out your own settings. Having a known good tube would help in this process.

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 Post subject: Re: Jackson 648A tube adapters
PostPosted: Jun Tue 04, 2019 12:54 am 
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I guess that was my question, will a 9 pin miniature socket be electrically the same as the larger 9 pin novar type socket so wiring a large 9 pin would match with the miniature 9 pin 1 - 9? my tester lists the novar tubes types for testing but has no socket ... so I could use a miniture 9 pin base and wire a larger novar socket to it.


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 Post subject: Re: Jackson 648A tube adapters
PostPosted: Jun Tue 04, 2019 3:37 am 
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I think this is what you want ....https://antiqueradios.com/forums/viewtopic.php?f=10&t=286245&hilit=jackson

Jason

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 Post subject: Re: Jackson 648A tube adapters
PostPosted: Jun Tue 04, 2019 1:48 pm 
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Yes this is exactly what I need, I see they use a octal plug wired with a novar socket instead of a 9 pin miniature plug... anyway works for me ...
Thanks
Elton


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 Post subject: Re: Jackson 648A tube adapters
PostPosted: Jun Tue 04, 2019 3:24 pm 
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Jackson sold those adapters, but you then cannot test tubes that have a top cap. If you wanted to actually use the 9 pin miniature socket and make an adapter, the 9 pin miniature, 9 pin novar, and 9 pin magnoval pins are 1 to 1 compatible (pin 1 to pin1, pin 2 to pin 2, etc)

Jim Cross


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 Post subject: Re: Jackson 648A tube adapters
PostPosted: Jun Tue 04, 2019 10:50 pm 
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And buy Jims' book. Everything you wanted to know about the 648.

https://vacuumtubesinc.com/index.php/books/the-jackson-model-648-manual.html

jason

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 Post subject: Re: Jackson 648A tube adapters
PostPosted: Jun Wed 05, 2019 1:54 pm 
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I have his book... I see Jackson sold them ... I kinda though there would be a DIY of making them for yourself ...only about making your own adapters for CRT's ...


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 Post subject: Re: Jackson 648A tube adapters
PostPosted: Jun Wed 05, 2019 10:21 pm 
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That's where I got the info for the adapter I made in the jackson book.

Jason

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 Post subject: Re: Jackson 648A tube adapters
PostPosted: Jun Tue 18, 2019 2:42 am 
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I gotta ask, what is the point of the Top Cap wire you show running off pin 7? can't you just use the TC connector on the 648?


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 Post subject: Re: Jackson 648A tube adapters
PostPosted: Jun Tue 18, 2019 3:02 am 
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I have an alligator clip that clips to the top cap connector. The tubes I was testing did not have a top cap connection. So that wire would connect to the TC for the test.
Octal socket is 8pins so the wire coming out the side makes a 9pin.
Jason

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