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 Post subject: couple of cool tubes
PostPosted: May Fri 27, 2022 3:42 pm 
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Joined: Mar Wed 16, 2011 10:44 pm
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Location: Peekskill, NY
Just purchased a home-build regenerative set, which had three type 12 tubes in it. Amazingly all the filaments are good.
One is a brass based cunningham 12 tipped tube with the lime getter on the press. The other two are CX-12s also cunningham,
with the interesting feature that those two have *both* a flashed getter and a lime getter on the press. Never saw that before.


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 Post subject: Re: couple of cool tubes
PostPosted: May Tue 31, 2022 2:40 pm 
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Thier all basically differant versions of the WD-12: https://www.radiomuseum.org/tubes/tube_wd12.html

jim rozen wrote:
The other two are CX-12s also cunningham, with the interesting feature that those two have *both* a flashed getter and a lime getter on the press. Never saw that before.

Most likely a product of a transitionary period for Cunningham in which they were phasing out the older lime getter in favor for the more modern flash getter.

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 Post subject: Re: couple of cool tubes
PostPosted: Jun Wed 01, 2022 3:05 pm 
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Have you verified the heater voltage on each? 1.1V?

Russ

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 Post subject: Re: couple of cool tubes
PostPosted: Jun Wed 01, 2022 3:54 pm 
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Yep, the two bakelite base tubes are in the radio, in use to good effect. I can't quite bring myself to fire up the brass base one yet. So
for now it's only one stage of audio. All being run off a single D cell for the filament supply. (how many Ah was a number six dry cell back
in the day?)


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 Post subject: Re: couple of cool tubes
PostPosted: Jun Wed 01, 2022 6:21 pm 
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I would not run the BBT one either. It is probably more valuable than most radios that it would be used in.

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 Post subject: Re: couple of cool tubes
PostPosted: Jun Wed 01, 2022 6:40 pm 
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Location: Peekskill, NY
It's an agonizing decision. In fact the tube was a dud when I got the set, until I re-flowed the pins. It was in the detector
socket of that regen set linked to in the general site. I might want to give a try, "just this once..."

=)


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 Post subject: Re: couple of cool tubes
PostPosted: Jun Wed 01, 2022 9:03 pm 
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(how many Ah was a number six dry cell back
in the day?)25 amps... When I was a boy these were $1.25 each. But my weekly allowance was .70 cents...

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 Post subject: Re: couple of cool tubes
PostPosted: Jun Wed 01, 2022 9:13 pm 
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I have to admit giving you "off the shelf" advice. I would try it too. Then wrap it up nicely. Just be vey careful. I don't think there is a "dim-bulb" that would work for this tube. Maybe just power the filament off of a rechargeable (lower voltage) dry cell, AA battery. Make sure that it lights prior to B+ being applied.

Russ

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