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Old 11th April 2013, 11:15 PM   #1
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Default Help ID this tube ^&$**@# lettering!

So, I'm going thru my stash trying to find pairs for outputs in SE....Found a trio of 6DQ6Bs but the internal structures are all different & getter "splotch" on one is barely there....plus, there is that "trickiness" of triode strapping these, so not these. Then there is this pair (Pictured), octal with five pins, kinda tall, cool looking, internals "match" good getter 'splotches'.....but no lettering to be found...even matching makes, green lettered GE brand..........could someone out there ID them just by the internals? I'm sure someone can as they would seem to be a particular "fingerprint" that those who know tubes VERY well can recognize.

__________________________________Thanks for looking, Rick..........
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Old 11th April 2013, 11:17 PM   #2
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Rectifier or damper diode. 6DE4?
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Old 11th April 2013, 11:26 PM   #3
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Click the image to open in full size.
One of left is 6AX4, 6DE4/6CQ4 on right. They could also be used in series string, so filament could be 12, 17, 24, 31 or so.
Most damper diodes are half wave, can rectify a lot of current (6CQ4 is 190ma) and are very high voltage (6CQ4 is 5500 volts).

Last edited by DeathRex; 11th April 2013 at 11:31 PM.
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Old 11th April 2013, 11:40 PM   #4
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I knew someone knew structures by sight, great call "Rex" ....oh well. I do have a bunch of 5U4GBs, along with those funky damper diodes..the ones with the top anode & the "cup" inside....6AX4s....but I do have one un-known that looks really cool, a six pin job with a bottle like the common 2A3/300B but smaller..........

_________________________________thanks "Rex".......Rick............
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Old 11th April 2013, 11:52 PM   #5
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25Z5 most likely.
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Old 12th April 2013, 12:49 AM   #6
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Quote:
Originally Posted by Richard Ellis View Post
I do have a bunch of 5U4GBs, along with those funky damper diodes..the ones with the top anode & the "cup" inside....
Those are high voltage rectifiers, like the 1B3. They are rated at 25KV and 2ma. Usually of no use.
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