| Author |
Message |
flipper
Guest
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 Posted:
Tue Sep 20, 2005 1:50 pm Post subject:
Mystery Tube |
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In a rather strange turn of events I have been given what the
presenter said was simply a "transmitting tube."
Well, it arrived today and the thing, a planar triode I presume, is
huge. 9.75 inches stem to stern and 4 inch diameter at the plate
heatsink.
The only markings are, on the plate heatsink, "THERMAEL", or
"THERMAIL", or "THEMRACL," or "THERMALL." Hard to tell as the next to
last letter is faded/scratched somewhat, on a red, lightning bolt
framed, triangular background. The 'R' also tails into a lightning
bolt. "5-6" is under it.
On one of the lower rings there is a small "7647" in the same red as
the above label. And at the bottom, the number "Y6-4479" has been hand
engraved onto it.
Searches don't seem to come up with anything. Does anyone in here have
an idea what it is and where I could get a data sheet on it?
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Patrick Turner
Guest
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| Posted:
Tue Sep 20, 2005 7:56 pm Post subject:
Re: Mystery Tube |
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flipper wrote:
| Quote: | In a rather strange turn of events I have been given what the
presenter said was simply a "transmitting tube."
Well, it arrived today and the thing, a planar triode I presume, is
huge. 9.75 inches stem to stern and 4 inch diameter at the plate
heatsink.
The only markings are, on the plate heatsink, "THERMAEL", or
"THERMAIL", or "THEMRACL," or "THERMALL." Hard to tell as the next to
last letter is faded/scratched somewhat, on a red, lightning bolt
framed, triangular background. The 'R' also tails into a lightning
bolt. "5-6" is under it.
|
Take some pictures and post them at a binaries ng or to those who might
know.
Patrick Turner.
| Quote: |
On one of the lower rings there is a small "7647" in the same red as
the above label. And at the bottom, the number "Y6-4479" has been hand
engraved onto it.
Searches don't seem to come up with anything. Does anyone in here have
an idea what it is and where I could get a data sheet on it? |
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Jon Yaeger
Guest
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| Posted:
Tue Sep 20, 2005 8:28 pm Post subject:
Re: Mystery Tube |
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in article iuhvi1lo76fjes4ol71nuvmamlmlhad280@4ax.com, flipper at
flipper@fish.net wrote on 9/20/05 4:50 AM:
| Quote: | In a rather strange turn of events I have been given what the
presenter said was simply a "transmitting tube."
Well, it arrived today and the thing, a planar triode I presume, is
huge. 9.75 inches stem to stern and 4 inch diameter at the plate
heatsink.
The only markings are, on the plate heatsink, "THERMAEL", or
"THERMAIL", or "THEMRACL," or "THERMALL." Hard to tell as the next to
last letter is faded/scratched somewhat, on a red, lightning bolt
framed, triangular background. The 'R' also tails into a lightning
bolt. "5-6" is under it.
On one of the lower rings there is a small "7647" in the same red as
the above label. And at the bottom, the number "Y6-4479" has been hand
engraved onto it.
Searches don't seem to come up with anything. Does anyone in here have
an idea what it is and where I could get a data sheet on it?
|
How do you know it is a transmitting tube? Can you prove it beyond doubt?
What evidence do you have to conclude that it is a planar triode? I don't
believe your interpretation of the markings because I cannot see them. Can
you provide photographs of all surfaces of the device? Indeed, is there any
knowledge so certain that no reasonable man can doubt it? |
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flipper
Guest
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| Posted:
Wed Sep 21, 2005 4:37 am Post subject:
Re: Mystery Tube |
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On Tue, 20 Sep 2005 11:28:07 -0400, Jon Yaeger <jono_1@bellsouth.net>
wrote:
| Quote: | in article iuhvi1lo76fjes4ol71nuvmamlmlhad280@4ax.com, flipper at
flipper@fish.net wrote on 9/20/05 4:50 AM:
In a rather strange turn of events I have been given what the
presenter said was simply a "transmitting tube."
Well, it arrived today and the thing, a planar triode I presume, is
huge. 9.75 inches stem to stern and 4 inch diameter at the plate
heatsink.
The only markings are, on the plate heatsink, "THERMAEL", or
"THERMAIL", or "THEMRACL," or "THERMALL." Hard to tell as the next to
last letter is faded/scratched somewhat, on a red, lightning bolt
framed, triangular background. The 'R' also tails into a lightning
bolt. "5-6" is under it.
On one of the lower rings there is a small "7647" in the same red as
the above label. And at the bottom, the number "Y6-4479" has been hand
engraved onto it.
Searches don't seem to come up with anything. Does anyone in here have
an idea what it is and where I could get a data sheet on it?
|
I presume this is some kind of joke so I'll play along.
| Quote: | How do you know it is a transmitting tube?
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Never said it was. I said the presenter said it was.
| Quote: | Can you prove it beyond doubt?
|
Prove what? Your incorrect characterization?
| Quote: | What evidence do you have to conclude that it is a planar triode?
|
It looks like one, to me. But my presumption may be in error, which is
why I asked others for their opinion/knowledge.
| Quote: | I don't
believe your interpretation of the markings because I cannot see them.
|
What you 'believe' is, of course, your problem but numbers and letters
are not an 'interpretation'.
| Quote: | Can
you provide photographs of all surfaces of the device?
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I don't have a suitable camera.
I realize that doesn't suit the 'gotcha' you had in mind.
| Quote: | Indeed, is there any
knowledge so certain that no reasonable man can doubt it?
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Yes, with the key word being "reasonable." |
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flipper
Guest
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| Posted:
Wed Sep 21, 2005 4:44 am Post subject:
Re: Mystery Tube |
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On Tue, 20 Sep 2005 23:52:08 GMT, Bob Weiss <bob.weiss@verizon.net>
wrote:
| Quote: | flipper wrote:
In a rather strange turn of events I have been given what the
presenter said was simply a "transmitting tube."
Well, it arrived today and the thing, a planar triode I presume, is
huge. 9.75 inches stem to stern and 4 inch diameter at the plate
heatsink.
The only markings are, on the plate heatsink, "THERMAEL", or
"THERMAIL", or "THEMRACL," or "THERMALL." Hard to tell as the next to
last letter is faded/scratched somewhat, on a red, lightning bolt
framed, triangular background. The 'R' also tails into a lightning
bolt. "5-6" is under it.
On one of the lower rings there is a small "7647" in the same red as
the above label. And at the bottom, the number "Y6-4479" has been hand
engraved onto it.
Searches don't seem to come up with anything. Does anyone in here have
an idea what it is and where I could get a data sheet on it?
It isn't much, but the brand is most likely "Thermall", a (now defunct?)
manufacturer of induction/dielectric heating equipment. I have a glass
triode (looks like a 3-500Z) in my collection with their logo on it.
|
Thanks. That helps some.
I did try a search with Thermall but, as you can imagine, a bazillion
unrelated 'thermal' this or that pages came up but nothing for that
company or tubes.
Do you think they actually made them or simply put their logo on them?
>Bob Weiss N2IXK |
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Bret Ludwig
Guest
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| Posted:
Wed Sep 21, 2005 4:44 am Post subject:
Re: Mystery Tube |
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Is it perhaps a 7647 planar triode ?
I haven't found one listed in any online guides but I only looked a
short while. |
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flipper
Guest
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| Posted:
Wed Sep 21, 2005 4:44 am Post subject:
Re: Mystery Tube |
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On 20 Sep 2005 19:19:19 -0700, "Bret Ludwig" <bretldwig@yahoo.com>
wrote:
| Quote: | Is it perhaps a 7647 planar triode ?
I haven't found one listed in any online guides but I only looked a
short while.
|
Well, since that's a number on it, and printed, I suspected as much
but I can't find a listing anywhere for a 7647. |
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Chris Hornbeck
Guest
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| Posted:
Wed Sep 21, 2005 4:44 am Post subject:
Re: Mystery Tube |
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On Tue, 20 Sep 2005 22:38:43 -0500, flipper <flipper@fish.net> wrote:
| Quote: | Well, since that's a number on it, and printed, I suspected as much
but I can't find a listing anywhere for a 7647.
|
It's almost certainly a date code, DOM, or re-manufacture.
47th week of 1976.
Chris Hornbeck |
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flipper
Guest
|
| Posted:
Wed Sep 21, 2005 4:44 am Post subject:
Re: Mystery Tube |
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On Tue, 20 Sep 2005 14:56:26 GMT, Patrick Turner
<info@turneraudio.com.au> wrote:
| Quote: |
flipper wrote:
In a rather strange turn of events I have been given what the
presenter said was simply a "transmitting tube."
Well, it arrived today and the thing, a planar triode I presume, is
huge. 9.75 inches stem to stern and 4 inch diameter at the plate
heatsink.
The only markings are, on the plate heatsink, "THERMAEL", or
"THERMAIL", or "THEMRACL," or "THERMALL." Hard to tell as the next to
last letter is faded/scratched somewhat, on a red, lightning bolt
framed, triangular background. The 'R' also tails into a lightning
bolt. "5-6" is under it.
Take some pictures and post them at a binaries ng or to those who might
know.
|
I'll try but, at the moment, I don't have anything to take pictures
with.
Also looks like I may be a bit preoccupied with a hurricane for the
next few days/weeks to devote much time to finding one.
| Quote: |
Patrick Turner.
On one of the lower rings there is a small "7647" in the same red as
the above label. And at the bottom, the number "Y6-4479" has been hand
engraved onto it.
Searches don't seem to come up with anything. Does anyone in here have
an idea what it is and where I could get a data sheet on it? |
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| Back to top |
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Bob Weiss
Guest
|
| Posted:
Wed Sep 21, 2005 4:44 am Post subject:
Re: Mystery Tube |
|
|
flipper wrote:
| Quote: | In a rather strange turn of events I have been given what the
presenter said was simply a "transmitting tube."
Well, it arrived today and the thing, a planar triode I presume, is
huge. 9.75 inches stem to stern and 4 inch diameter at the plate
heatsink.
The only markings are, on the plate heatsink, "THERMAEL", or
"THERMAIL", or "THEMRACL," or "THERMALL." Hard to tell as the next to
last letter is faded/scratched somewhat, on a red, lightning bolt
framed, triangular background. The 'R' also tails into a lightning
bolt. "5-6" is under it.
On one of the lower rings there is a small "7647" in the same red as
the above label. And at the bottom, the number "Y6-4479" has been hand
engraved onto it.
Searches don't seem to come up with anything. Does anyone in here have
an idea what it is and where I could get a data sheet on it?
|
It isn't much, but the brand is most likely "Thermall", a (now defunct?)
manufacturer of induction/dielectric heating equipment. I have a glass
triode (looks like a 3-500Z) in my collection with their logo on it.
Bob Weiss N2IXK |
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flipper
Guest
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| Posted:
Wed Sep 21, 2005 10:16 am Post subject:
Re: Mystery Tube |
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On Wed, 21 Sep 2005 04:26:45 GMT, Chris Hornbeck
<chrishornbeckremovethis@att.net> wrote:
| Quote: | On Tue, 20 Sep 2005 22:38:43 -0500, flipper <flipper@fish.net> wrote:
Well, since that's a number on it, and printed, I suspected as much
but I can't find a listing anywhere for a 7647.
It's almost certainly a date code, DOM, or re-manufacture.
47th week of 1976.
Chris Hornbeck
|
That's what I suspected the hand engraved number was. Why would you
suspect the red stamped on number first?
I suppose the red one could be DOM and the engraved one a rebuild.
So you think the "5-6" is the type? |
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Chris Hornbeck
Guest
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| Posted:
Wed Sep 21, 2005 10:37 am Post subject:
Re: Mystery Tube |
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On Wed, 21 Sep 2005 00:16:04 -0500, flipper <flipper@fish.net> wrote:
| Quote: | Well, since that's a number on it, and printed, I suspected as much
but I can't find a listing anywhere for a 7647.
It's almost certainly a date code, DOM, or re-manufacture.
47th week of 1976.
That's what I suspected the hand engraved number was. Why would you
suspect the red stamped on number first?
|
The stampings were done by hand, too. Probably just
exactly like you or I would do it tomorrow morning.
This YYWW format is pretty common, and a likely
first guess, *especially* for such a likely number.
| Quote: | I suppose the red one could be DOM and the engraved one a rebuild.
|
Sounds good to me.
| Quote: | So you think the "5-6" is the type?
|
Sorry, no clue. But if neither GE or ARRL lists a
number (like 7647, for example) *that* number seems
less likely. Not at all impossible, just a lot less
likely.
Good fortune,
BTW, what are ya gonna do with *one* forced-air
cooled transmitting tube?
Chris Hornbeck |
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flipper
Guest
|
| Posted:
Wed Sep 21, 2005 11:36 am Post subject:
Re: Mystery Tube |
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On Wed, 21 Sep 2005 05:37:17 GMT, Chris Hornbeck
<chrishornbeckremovethis@att.net> wrote:
| Quote: | On Wed, 21 Sep 2005 00:16:04 -0500, flipper <flipper@fish.net> wrote:
Well, since that's a number on it, and printed, I suspected as much
but I can't find a listing anywhere for a 7647.
It's almost certainly a date code, DOM, or re-manufacture.
47th week of 1976.
That's what I suspected the hand engraved number was. Why would you
suspect the red stamped on number first?
The stampings were done by hand, too. Probably just
exactly like you or I would do it tomorrow morning.
|
Could be.
| Quote: | This YYWW format is pretty common, and a likely
first guess, *especially* for such a likely number.
I suppose the red one could be DOM and the engraved one a rebuild.
Sounds good to me.
So you think the "5-6" is the type?
Sorry, no clue. But if neither GE or ARRL lists a
number (like 7647, for example) *that* number seems
less likely. Not at all impossible, just a lot less
likely.
|
Yep.
| Quote: |
Good fortune,
BTW, what are ya gonna do with *one* forced-air
cooled transmitting tube?
|
Hehe. I dunno, personal plasma cannon?
Seriously, it wasn't a part of any 'plan'.
I was ordering parts and the place had some tubes on sale for a
ridiculously low price so, hot dog my lucky day, I ordered a gaggle
only to get an email explaining the prices were messed up. Somewhere
in the exchange of emails I mentioned one of them was intended for a
tube computer panel display I have and, well. got an email saying he
was sending me, for free, that tube and a "transmitting tube." I had
no idea what it would be, and still don't ;) But it was a heck of a
nice gesture on their part.
I imagine he thought it would make for a good display piece too, and
I'll probably do that, because he sure as heck didn't pick it for
being cheap to ship.
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flipper
Guest
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| Posted:
Wed Sep 21, 2005 11:57 am Post subject:
Re: Mystery Tube |
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On Wed, 21 Sep 2005 05:37:17 GMT, Chris Hornbeck
<chrishornbeckremovethis@att.net> wrote:
| Quote: | On Wed, 21 Sep 2005 00:16:04 -0500, flipper <flipper@fish.net> wrote:
Well, since that's a number on it, and printed, I suspected as much
but I can't find a listing anywhere for a 7647.
It's almost certainly a date code, DOM, or re-manufacture.
47th week of 1976.
That's what I suspected the hand engraved number was. Why would you
suspect the red stamped on number first?
The stampings were done by hand, too. Probably just
exactly like you or I would do it tomorrow morning.
This YYWW format is pretty common, and a likely
first guess, *especially* for such a likely number.
I suppose the red one could be DOM and the engraved one a rebuild.
Sounds good to me.
So you think the "5-6" is the type?
Sorry, no clue. But if neither GE or ARRL lists a
number (like 7647, for example) *that* number seems
less likely. Not at all impossible, just a lot less
likely.
|
I did, just now, find a place selling a "5-6" made by "W T LaROSE" so
maybe that really is the type number.
| Quote: |
Good fortune,
BTW, what are ya gonna do with *one* forced-air
cooled transmitting tube?
Chris Hornbeck |
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Bob Weiss
Guest
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| Posted:
Wed Sep 21, 2005 4:19 pm Post subject:
Re: Mystery Tube |
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flipper wrote:
| Quote: |
Do you think they actually made them or simply put their logo on them?
|
Most likely they simply had their logo put on tubes they purchased
elsewhere. The infrastructure they would need to build transmitting
tubes would be more than they needed to build induction heaters! The
tube I have looks EXACTLY like an Eimac 3-500Z, down to the locations of
the internal date codes, number of welds, etc.
Bob Weiss N2IXK |
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