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 Post subject: Testing UX-120 Tube on Tube Tester
PostPosted: May Fri 25, 2018 2:34 am 
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I would like to test some UX-120 tubes on my Hickok 600a . The voltage would be the same as 99 tubes, but I haven't found any test data for them. Does anyone have that or know where to find it?

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 Post subject: Re: Testing UX-120 Tube on Tube Tester
PostPosted: May Fri 25, 2018 2:59 am 
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Does it list a 20?

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 Post subject: Re: Testing UX-120 Tube on Tube Tester
PostPosted: May Fri 25, 2018 3:40 am 
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No "20" listed.

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 Post subject: Re: Testing UX-120 Tube on Tube Tester
PostPosted: May Fri 25, 2018 3:44 am 
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Here's what I was able to find.

120 3.0 JR-3200-0 71 73 P4 525 OK above 325

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 Post subject: Re: Testing UX-120 Tube on Tube Tester
PostPosted: May Fri 25, 2018 3:50 am 
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Thanks guys, I appreciate you taking the time to help me out.

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 Post subject: Re: Testing UX-120 Tube on Tube Tester
PostPosted: May Fri 25, 2018 3:05 pm 
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Lucky my Hickok came with the addendum books besides the roll chart. Otherwise alot of these prewar tubes would be a problem.

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 Post subject: Re: Testing UX-120 Tube on Tube Tester
PostPosted: May Fri 25, 2018 5:46 pm 
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If we can look up "20" on the charts and have it apply to the -120 tube, is it also true that to test a -199, we can use the "99" settings?

Thanks.


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 Post subject: Re: Testing UX-120 Tube on Tube Tester
PostPosted: May Fri 25, 2018 7:05 pm 
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busterdog57 wrote:
If we can look up "20" on the charts and have it apply to the -120 tube, is it also true that to test a -199, we can use the "99" settings?

Thanks.
Yep, on a 299 too...

FWIW, in a pinch a '99 can be used as a sub with reduced output power... B+ and bias changed to suit...

Chas

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Last edited by Chas on Sep Tue 21, 2021 8:44 pm, edited 1 time in total.

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 Post subject: Re: Testing UX-120 Tube on Tube Tester
PostPosted: May Fri 25, 2018 8:38 pm 
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Ok, thanks - just tried it on the small pile of 199s I have, using the settings for 99 given by the documentation for my tester. It says to use only 65v on the plate, but isn't the 99 a 90v tube? I ask because some of them show not-so-good at 65 but very good at 90.

My tester is the Heathkit TC-2, which I know is pretty pedestrian...but it's rebuilt and accurate within its design limitations, and all I have right now.


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 Post subject: Re: Testing UX-120 Tube on Tube Tester
PostPosted: Sep Tue 21, 2021 4:33 am 
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Joined: Jul Thu 08, 2021 8:50 pm
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busterdog57 wrote:
Ok, thanks - just tried it on the small pile of 199s I have, using the settings for 99 given by the documentation for my tester. It says to use only 65v on the plate, but isn't the 99 a 90v tube? I ask because some of them show not-so-good at 65 but very good at 90.


I have NRI-69 tube tester and the manual for NRI-69 instructs to use load 65 for X-99 and its variants. Does it mean 65V plate voltage?
The data below, says that the plate voltage for UX-199 is 22-45V. If that's true, load 65 should not mean 65 volts.


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X-99_data_chart.jpg
X-99_data_chart.jpg [ 310.38 KiB | Viewed 185 times ]
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