Re: What's the rarest tube you ever used?
- From: "Andre Jute" <fiultra@xxxxxxxxx>
- Date: 25 Feb 2006 21:35:48 -0800
John Stewart wrote:
Andre Jute wrote:
Most of us use the same tubes over and over again, in my case 6SN7,
417A, EL34, 300B, 845, SV572-3 and -10.
The rarest tube I have used is the 7044, which isn't rare at all in the
sense that it is common and cheap, with plenty of computer pulls
available. But hardly anyone else uses it. It's a sort of taller 5687,
which is more common, though while checking my statement in the
previous sentence, I see the 5687 described as a tube with "an
underground following"; you have to wonder what that makes the 7044.
Andre Jute
Visit Jute on Amps at http://members.lycos.co.uk/fiultra/
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Here is more
WE264A- A friend's father was a projectionist at a movie theater. He had
quite a bit of WE stuff so I somehow ended up with a few of these. One of
them made a pretty good regen RX, altho it ate #6 cells on a regular basis!
201A- Had some so they ended up in various BC RX's.
1H5GT/1N5GT- These were in my first good SW RX. The schema was published in
the Allied Radio Builder's Handbook. Copyright date shows 1943. I still
have it in my library. There are several interesting circuits, mostly
receivers.
1T5GT- I added this to the SW RX above, so it could drive a loudspeaker. I
guess that would have to qualify as the first power amp I ever built.
6U6GT's- These are a Rogers (Canadian) tube AFAIK. A bit like a 6W6GT but
less power. Probably a spinoff from Philips with who Rogers had a business
hookup. A pair of these were in my first PP amp, driving thru a Jensen 2430
OPT. The 2430 is a lot like the Hammond 125D universal. I used a half-wave
doubler in the PS, right off the line, with no isolation, something I would
not do at all now! When one is young many chances are taken, some of them
fairly stupid!
815- This was a more powerful PP amp driving thru a Hammond 1678 OPT, no
longer in their catalogue. The first version used a triode connected 6F6 as
a transformer coupled driver to the OP grids. Not the best way to go but it
did make a lot of noise!
ZrO high intensity Zirconium Oxide lamp made by Sylvania- This one is very
different. It is a high intensity point source white light. It is gas
filled, which kind I can't remember. When running the voltage drop is about
15 volts & current around 6 amps. It has a negative resistance while in
operation so I built a CC PS for it, complete with a 180 volt starter to
get things running. It looked a lot like an early 10 or 50, globe bulb on a
regular 4-pin base. Used in the lab at U of Toronto, Physics where I worked
for some optical experiments.
813- Used some of these too. One in a high voltage CC source which powered
up an experimental laser, around 1960. Another in an RF oscillator, the
application of which I can't recall, again at U of T, Physics.
Hopes this confuses some, but all was great stuff to learn from!
Cheers, John Stewart
I'm not confused, John. Some of those numbers ring a bell. I must have
seen them in a history book. I went to look up the 304TH. "Impressive"
somehow doesn't quite convey the indelible impression it makes... The
first reference I came to spoke of a 16in spark.
Are those 1x5GT tubes battery jobs?
Andre Jute
.
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