[Boatanchors] TV-7 Testing for 2C51 / 5670 / WE396A

William w_b_morton at hotmail.com
Tue Sep 2 21:16:33 EDT 2014

Hello All,

Picked up a bag of tubes from an estate and am in the process of testing them.

Right now I am having issues with some 2C51 / 5670 / WE396A tubes.  Hopefully someone out there has some experience with these and can provide some suggestions.

First, I see the following setups in the TV-7 manual for both the 2C51 and WE396 tubes:
(In order:   Filament, Selectors, bias, Shunt, Range, Press, Minimum Value)
Sec 1:  6.3  KR7-6082  17  ----  D  3  26
Sec 2:  6.3  KR3-4028  17  ----  D  3  26

For the 5670 tube I see:
Sec 1:  6.3  KR7-6082  17  ----  D  3  26
Sec 2:  6.3  KR3-4020  17  ----  D  3  26

The 5670 is slightly different on the setup for section 2.

When I test section 1, no problem.  Check line voltage, check shorts, then test (press button 3).  

The problem occurs when I test section 2:  Neon short indicator lights up at position #4 for every tube I have.  I have tested both WE396 and GE 5670 tubes and they all show the same issue.

My question to the group:  Is there an addendum somewhere with a different setting for section 2?  The settings I use come from TB 11-6625-274-12/1, dated January, 1962.  I have poked around the web and have not found any different documents with settings for these tubes.

Right now my alternatives are to test the tubes on a different tester, but I have heard all sorts of comments through the years that different testers can have quite different readings.  I would prefer to stick with the TV-7, but I do have a Heath TT-1, Triplett 3444-A, and a Hickok 605A.  Would one of those be preferred above the others? 

Thanks in advance for all of your help.

Best Regards,


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