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Help Identifying A VERY Old Vacumm Tube?

I recently got a 1920's RCA Radiola 60 Tube Radio , and when I was servicing it I kinda accidently dropped a tube and the vaccumm seal broke and the glass broke. on the side of the tube it says "Philco H 5" it has four pins two bigger two smaller. Here are some pictures of it for reference.

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Goodhart8 years ago
if it is a full rect. tube it might be a T-5AR4-C (or a 5U4, 5Y3, or a 6CA4) ?
jackillac92 (author)  Goodhart8 years ago
Thanks do you know where I can buy them?
I believe Gmoon is correct here (it has been a loooong time since I dealt with many tubes...sorry about misleading)....well there are still a few places left ( I can vouch for none of the following) Vacuum Tubes, Thermionic Valves, Electron tubes...
or Vacuum Tube net
there is Orlando Vacuum tubes
and finally the Antique Electronic Supply
...actually there are many more that a quick Google will bring up....
jackillac92 (author)  Goodhart8 years ago
Is it a double rect one or the full rect one or single rect?
I think he meant a dual diode tube, and since a rectifier bridge is made up of 4 diodes, that would be a half wave rectifier tube, and if there is another, then the combination would make a full wave rectifier.
gmoon Goodhart8 years ago
In tube circuits, a dual-diode rectifier is all you need for full-wave rectification. The difference is the transformer, which is center-tapped. A second tube (and socket, wiring, etc.) was more expensive in those days, and a larger transformer with twice the coil wiring was cheaper. You'll see transformers like this speced as 400-0-400, or something similar. It's essentially +400 and -400 in respect to the CT (and you can get 800V if you bridge-rectify the ends and ignore the center.) With silicon diodes costing only pennies, the center-tapped power transformer has disappeared from most modern circuits. Illustration is from wikipedia...
500px-Fullwave.rectifier.en.png
Goodhart gmoon8 years ago
Thanks Gmoon, I was unaware of this aspect of the tube (they were disappearing, more or less when I was still young and never fully got to "play" in that area.....I still remember my Dad's first handheld transistor radio, which took 4 D cells and had what appeared to be a metal shielded tube in it :-) It was in a leather case, no less, made by GE, IIRC.

I wish I had kept it and cleaned it up.....the batteries leaked one day and the battery holder became, um, messy.
gmoon Goodhart8 years ago
You and I are contemporaries (from what you've written, I'm ~ one yr. older), so we both witnessed the "tail end" of the tube era. I only became interested much later (through guitar stuff.) But growing up, we had a tube stereo console, tube TVs, etc... I remember those early transistor radios.... $59 for a radio with three transistors... :-\
Goodhart gmoon8 years ago
yeah, I kick myself every time I think about my throwing it away, when I could have just either cleaned it up a bit in the battery compartment or replaced that piece. I actually found a picture of one EXACTLY like the one I had....
r-gewhite1958.jpg
gmoon Goodhart8 years ago
Retro cool. I imagine the majority of these are landfill, which is a shame... (BTW, radio nerds are just as fanatical as guitar amp geeks or audiophile wonks...)
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