vacuum tube education needed - Printable Version

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vacuum tube education needed - truePhilco - 04-24-2020

Dose a globe vacuum tube 26-2J and 26--L2 get tested the same way as a 26 tube and what is the difference?

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RE: vacuum tube education needed - gregb - 04-24-2020

I believe so, I think the 2J and L2 might just be date codes. Post a picture just in case they are something different.

Gregb

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RE: vacuum tube education needed - truePhilco - 04-24-2020

Thanks, here they are.

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RE: vacuum tube education needed - gregb - 04-24-2020

YUP, there just #26 tubes. Test them all the same.

Gregb

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RE: vacuum tube education needed - Radioroslyn - 05-06-2020

I'll mention in passing 26's kind of oddball tubes. The filament voltage is very low (for an ac operated tube) and the current is high. From what I've read it was to replace the 01A (5.0v fil). There was 71A and 112A 5.0 tubes. These were throwback from the battery days. I think it's the only 1.5v @ 1.05A. I'll make the recommendation if you test them I would measure the filament voltage @ the pins when it's in the tester. You may find that it's low. You could adjust the line set pot up to get the proper voltage but not sure if that would affect the hv and bias voltage.

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