Happened to stumble across the fact that Raytheon made the RK-41, which was
an 807 with a 2.5 volt heater.

Did any other 2.5 volt 807 clones exist? Seems plausible, as there were 2.5
volt 6L6 equivalents.

Just curious.

BFoelsch wrote:

Happened to stumble across the fact that Raytheon made the RK-41, which was
an 807 with a 2.5 volt heater.

Did any other 2.5 volt 807 clones exist? Seems plausible, as there were 2.5
volt 6L6 equivalents.

Just curious.

1619 JLS

Well, I knew about that one, but it is single ended and metal, making it a
6L6 clone. I was thinking of something glass with a top cap like the 807
itself. The Raytheon RK-41 is such a tube with a 2.5 volt heater. Did anyone
else make such a device?

Thanks again.

"John Stewart" wrote in message
...


BFoelsch wrote:

Happened to stumble across the fact that Raytheon made the RK-41, which
was
an 807 with a 2.5 volt heater.

Did any other 2.5 volt 807 clones exist? Seems plausible, as there were
2.5
volt 6L6 equivalents.

Just curious.

1619 JLS

BFoelsch wrote:

Happened to stumble across the fact that Raytheon made the RK-41, which was
an 807 with a 2.5 volt heater.

Did any other 2.5 volt 807 clones exist? Seems plausible, as there were 2.5
volt 6L6 equivalents.

Just curious.

An 807 is a 6L6 with a plate cap. A 1619 probably qualifies in some
way for what you are looking for. It is a 6L6 (metal) with a 2.5 volt heater
but without the plate cap.

Close enough? Some may not agree. JLS

John Stewart wrote:

An 807 is a 6L6 with a plate cap. A 1619 probably qualifies in some
way for what you are looking for. It is a 6L6 (metal) with a 2.5 volt heater
but without the plate cap.

Close enough? Some may not agree. JLS


The 1619 has a 2.5V FILAMENT, not a heater.

Bob Weiss N2IXK

BFoelsch wrote:

Well, I knew about that one, but it is single ended and metal, making it a
6L6 clone. I was thinking of something glass with a top cap like the 807
itself. The Raytheon RK-41 is such a tube with a 2.5 volt heater. Did anyone
else make such a device?

Thanks again.

According to NJ7P,
Prefered Substitutes .......................... None
Substitutes ................................... None

http://hereford.ampr.org//cgi-bin/tube?tube=RK41

Cheers,
Fred
--
+--------------------------------------------+
| Music: http://www3.telus.net/dogstarmusic/ |
| Projects: http://dogstar.dantimax.dk |
+--------------------------------------------+

Bob Weiss wrote:

John Stewart wrote:

An 807 is a 6L6 with a plate cap. A 1619 probably qualifies in some
way for what you are looking for. It is a 6L6 (metal) with a 2.5 volt
heater
but without the plate cap.

Close enough? Some may not agree. JLS



The 1619 has a 2.5V FILAMENT, not a heater.

Bob Weiss N2IXK

Are you sure? NJ7P shows it with a heater, and uses "heater" in the
cathode description.

Cheers,
Fred
--
+--------------------------------------------+
| Music: http://www3.telus.net/dogstarmusic/ |
| Projects: http://dogstar.dantimax.dk |
+--------------------------------------------+

Fred Nachbaur wrote:

The 1619 has a 2.5V FILAMENT, not a heater.

Bob Weiss N2IXK

Are you sure? NJ7P shows it with a heater, and uses "heater" in the
cathode description.

The RCA datasheet he http://frank.pocnet.net/sheets/049/1/1619.pdf
shows a filament.

Best regards,

Mikkel C. Simonsen

"Mikkel C. Simonsen" wrote:

Fred Nachbaur wrote:

The 1619 has a 2.5V FILAMENT, not a heater.

Bob Weiss N2IXK

Are you sure? NJ7P shows it with a heater, and uses "heater" in the
cathode description.

The RCA datasheet he http://frank.pocnet.net/sheets/049/1/1619.pdf
shows a filament.

Best regards,

Mikkel C. Simonsen

RCA TT-4 also shows a filament, something nice for mobile work.
But not many mobiles ever were on 2.5 volts. Perhaps none.

Must be something about a short, rugged filament (heater) that gets the
1619 into some sockets. The pin to socket connexion resistance has got
to be a problem with 2 amps & only 2.5 volts to work with. Probably
in many applications the cathode ran on the cool side. I wonder how
long the connexions on an ordinary octal socket would last.

Heater vs. filament? I suppose a matter of semantics.
After all, the filament does get hot in order to operate, so must be it's

own heater. But I guess it is customary to call such things as we do.
I will leave that to the language guru's!!

Cheers, John Stewart

John Stewart wrote:



Heater vs. filament? I suppose a matter of semantics.
After all, the filament does get hot in order to operate, so must be it's

own heater. But I guess it is customary to call such things as we do.
I will leave that to the language guru's!!


Filament:

Filamentary cathode, or Directly Heated cathode.

Heater:

Unipotential cathode, or Indirectly Heated cathode.

Bob Weiss N2IXK

John Stewart wrote:

"Mikkel C. Simonsen" wrote:

Fred Nachbaur wrote:

The 1619 has a 2.5V FILAMENT, not a heater.

Bob Weiss N2IXK

Are you sure? NJ7P shows it with a heater, and uses "heater" in the
cathode description.

The RCA datasheet he http://frank.pocnet.net/sheets/049/1/1619.pdf
shows a filament.

Best regards,

Mikkel C. Simonsen

RCA TT-4 also shows a filament, something nice for mobile work.
But not many mobiles ever were on 2.5 volts. Perhaps none.

Must be something about a short, rugged filament (heater) that gets the
1619 into some sockets. The pin to socket connexion resistance has got
to be a problem with 2 amps & only 2.5 volts to work with. Probably
in many applications the cathode ran on the cool side. I wonder how
long the connexions on an ordinary octal socket would last.

Octal connections are good for 3 amps at least, and give no troubles with
rectifier tubes.
I have used an octal socket and plug with 4 + 4 pins for the two phases of a
25.2 v at 5.4 amps balanced heater supply to 12 X 6550.
The plugs and sockets don't get warm, but each pin gripper
only has to take 1.35 A.
Now the 807 sockets and other old fashioned sockets made
in the 1930's were way overated for what they had to achieve, but they were
reliable.
If the leads to the pins and grippers are nice fat ones capable of 10 amps,
then any heat in the pin or gripper has someplace to go.


Heater vs. filament? I suppose a matter of semantics.
After all, the filament does get hot in order to operate, so must be it's

own heater. But I guess it is customary to call such things as we do.
I will leave that to the language guru's!!

Cheers, John Stewart

Tube types 45, 46, 49,50, 71A, were all filament type power tubes where
the word filament means the cathode.
There is no cathode connections for filament tubes in the data sheets in the
"Miniwatt" book of mine.

Patrick Turner.

On Mon, 24 May 2004 14:21:15 +1000, Patrick Turner wrote:

snip

Octal connections are good for 3 amps at least, and give no troubles with
rectifier tubes.
snip

3A shouldn't be a problem. We use 8-pin (octal-equivalent) and 11-pin
(slightly larger dia circle, but similar dia pins) relays at work. Many of
these have contacts rated to 8A or even 10A connected to each pin. I'm not
saying that you could get this current through the metal-glass seal
because of temperature rise problems, but it gives some idea of what the
plug/socket can carry.

--
Cheers...
Mick
Gave up on viruses & trojans - moved to Linux... :-)
Nascom & Gemini info at http://www.nascom.info

I don't know if the RK-41 is indirectly heated or filamentary -- a guess is
that it's indirectly heated, but that's odd for a 2.5 V tube -- but both the
1619 and the 1624 are 2.5 V 6L6 clones, both are filamentary (can't separate
the heater from the cathode circuit), but the 1624 is rated for 25 W like the
RK-41, while the 1619 is only 15 W or so.

Phil

BFoelsch wrote:

Happened to stumble across the fact that Raytheon made the RK-41, which was
an 807 with a 2.5 volt heater.

Did any other 2.5 volt 807 clones exist? Seems plausible, as there were 2.5
volt 6L6 equivalents.

Just curious.