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Old 17th November 2012, 11:01 PM   #1
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Default Need help to ID a tube...

Hi guys. I came across this nice Perryman single mesh plate power output tube. It has a nice ceramic base. I made an assumption that this was a 45 (or 245, ect), and tried to test on my Hickok 539B. The 2.5V voltage was too low to heat the filament. So, I then assumed it was a 50 (or 250, 350, etc), which uses 7.5V setting. The filament heated right up. I tested for shorts, and got one on setting A, which is expected for a 50 tube. So, at this point I assumed I had figured it out. But, when I pressed the P4 button, The "fuse" light lit up. So, obviously this isn't a 50. Any ideas? I know it isn't a good idea to try to use trial and error on a tube tester, but I was pretty sure of myself... I guess I'm not the expert I thought I was!
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Old 17th November 2012, 11:05 PM   #2
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Old 17th November 2012, 11:09 PM   #3
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Wow, never even heard of that company before. Should be easy enough to see where the grid and plate pins go.
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Old 18th November 2012, 07:30 AM   #4
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It looks like it could be a 210T.
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Old 18th November 2012, 03:33 PM   #5
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Originally Posted by Miles Prower View Post
It looks like it could be a 210T.
The 45, 50 and 10 (210) all use the same settings on the 539B (ER32000). The only difference is the filament voltage and bias voltage. Both the 50 and 10 use 7.5 filament voltage. I'm guessing that since the fuse indicator lit up, that the ER32000 setting is not correct for this particular tube? Or, perhaps it is correct, and something is wrong with the tube that isn't being picked up when I rotate the short dial through the various positions?

Strange stuff....
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Old 18th November 2012, 03:35 PM   #6
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"It looks like it could be a 210T"

Good call. I would love to have a pair of those.
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Old 18th November 2012, 03:51 PM   #7
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I dont see any grid support rods or even a grid for that matter. I am gonna bet its one of those big ol' halfwave rectifiers with a 7.5v filament, the 81. I have seen a few with mesh plates.
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Old 18th November 2012, 04:08 PM   #8
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Originally Posted by mctavish View Post
I dont see any grid support rods or even a grid for that matter. I am gonna bet its one of those big ol' halfwave rectifiers with a 7.5v filament, the 81. I have seen a few with mesh plates.
You sir, are correct. Thanks for the help!
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Old 18th November 2012, 04:18 PM   #9
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With pleasure!
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