A while back there was a 12v tube thread.

I saw this:

http://www.thamesandkosmos.com/products/ra/ra2.html

advertized in September Scientific American. The ad (on the
builditplayit.com site) says it uses a "double triode" and
requires 8-AA batteries (nominally 12V).

I wonder if it is a 12V tube kit. Perhaps a 12AE7 or similar.

Anyone know?
--
Steven D. Swift, , http://www.novatech-instr.com
NOVATECH INSTRUMENTS, INC. P.O. Box 55997
206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA

Steven Swift wrote:

A while back there was a 12v tube thread.

I saw this:

http://www.thamesandkosmos.com/products/ra/ra2.html

advertized in September Scientific American. The ad (on the
builditplayit.com site) says it uses a "double triode" and
requires 8-AA batteries (nominally 12V).

I wonder if it is a 12V tube kit. Perhaps a 12AE7 or similar.

Anyone know?

Can't speak for the kit but I know some guys have successfully used a
plain old 12AT/AU/AX7 at 12 volts with acceptable results.

-Bill

Bill ) writes:
Steven Swift wrote:

A while back there was a 12v tube thread.

I saw this:

http://www.thamesandkosmos.com/products/ra/ra2.html

advertized in September Scientific American. The ad (on the
builditplayit.com site) says it uses a "double triode" and
requires 8-AA batteries (nominally 12V).

I wonder if it is a 12V tube kit. Perhaps a 12AE7 or similar.

Anyone know?

Can't speak for the kit but I know some guys have successfully used a
plain old 12AT/AU/AX7 at 12 volts with acceptable results.

-Bill

There were a couple of articles in Popular Electronics in the early
sixties about doing that. And oscillator and then an amplifier,
if I remember the sequence properly. From memory, the author
referred to them as "starved circuits".

I have a vague memory of trying one of them in the early seventies,
but I honestly can't remember if I did or didn't.

Michael VE2BVW

Bill wrote:

Steven Swift wrote:

A while back there was a 12v tube thread.

I saw this:

http://www.thamesandkosmos.com/products/ra/ra2.html

advertized in September Scientific American. The ad (on the
builditplayit.com site) says it uses a "double triode" and
requires 8-AA batteries (nominally 12V).

I wonder if it is a 12V tube kit. Perhaps a 12AE7 or similar.

Anyone know?

Can't speak for the kit but I know some guys have successfully used a
plain old 12AT/AU/AX7 at 12 volts with acceptable results.

-Bill


The ARN-6 direction finding receiver used 24 volts on the plates of
12SN7 tubes. I wonder how well they would perform at 12 volts?
--
?

Michael A. Terrell
Central Florida

On Wed, 14 Sep 2005, Bill wrote:

Steven Swift wrote:

A while back there was a 12v tube thread.

I saw this:

http://www.thamesandkosmos.com/products/ra/ra2.html

advertized in September Scientific American. The ad (on the
builditplayit.com site) says it uses a "double triode" and
requires 8-AA batteries (nominally 12V).

I wonder if it is a 12V tube kit. Perhaps a 12AE7 or similar.

Anyone know?

Can't speak for the kit but I know some guys have successfully used a plain
old 12AT/AU/AX7 at 12 volts with acceptable results.

-Bill


Yes, I've done this, too. Also, when I was a kid playing with this stuff,
I got a 1T4 to audio oscillate at 7 volts on the plate.

On 9/16/05 3:20 PM, in article
, "Straydog"
wrote:



On Wed, 14 Sep 2005, Bill wrote:

Steven Swift wrote:

A while back there was a 12v tube thread.

I saw this:

http://www.thamesandkosmos.com/products/ra/ra2.html

advertized in September Scientific American. The ad (on the
builditplayit.com site) says it uses a "double triode" and
requires 8-AA batteries (nominally 12V).

I wonder if it is a 12V tube kit. Perhaps a 12AE7 or similar.

Anyone know?

Can't speak for the kit but I know some guys have successfully used a plain
old 12AT/AU/AX7 at 12 volts with acceptable results.

-Bill


Yes, I've done this, too. Also, when I was a kid playing with this stuff,
I got a 1T4 to audio oscillate at 7 volts on the plate.



In the 50's I used a 1T4 as a single tube crystal controlled tx on 80M. I
could often work 400 miles in the daytime. Nice little toob.

Don

On 15 Sep 2005 01:27:23 GMT, Steven Swift wrote:
A while back there was a 12v tube thread.

I saw this:

http://www.thamesandkosmos.com/products/ra/ra2.html

advertized in September Scientific American. The ad (on the
builditplayit.com site) says it uses a "double triode" and
requires 8-AA batteries (nominally 12V).

A goolgle for "space charge tubes" will probably turn up a lot
of info on low voltage tubes.

The Summer 2005 edition of Sprat, the GQRP club magazine, has a circuit
for a vfo using a XFY43 hearing aid valve/tube running off 12V. Better
stability than a fet oscillator, apparently.

--
Cheers,
Stan Barr stanb .at. dial .dot. pipex .dot. com
(Remove any digits from the addresses when mailing me.)

The future was never like this!

A number of Australian hybrid car radios of the 1960 period used
special valves based on 12v HT but the output stage used transistors.
Heaters were 6v with pairs of tubes wired in series. Tube types
included 6DS8, 6DR8 & 6ES8 for RF, Mixer, IF and detector stages.

These sets would not have worked with dry cells due to the use of
tubes with heated cathodes.

Simon.


On 15 Sep 2005 01:27:23 GMT, (Steven Swift) wrote:

A while back there was a 12v tube thread.

I saw this:

http://www.thamesandkosmos.com/products/ra/ra2.html

advertized in September Scientific American. The ad (on the
builditplayit.com site) says it uses a "double triode" and
requires 8-AA batteries (nominally 12V).

I wonder if it is a 12V tube kit. Perhaps a 12AE7 or similar.

Anyone know?

My project this winter is to build a single tube transmitter into an Altoids
box. I am sure that has been done before, but I plan to build in the entire
power supply and key.

It should work. Using an old geiger counter tube, I will use a AA battery
for the filament and will first try a 9 volt battery for the plate and
screen. That should be fine. If not, I will use either a 15 volt or 22
volt battery - but the 9 volt is cheaper.

Power will be low, but having a friend a mile away makes the power
requirement modest. CW only.

As a kid, I built a one tube broadcast receiver using an old acorn tube and
15 volt battery for the plate.

Colin K7FM

I was not aware of any interest in 12 volt plate tubes. In my backlog of
things going to EBAY I have a Gonset shortwave converter that used this
technology. I would consider $15 + shipping to be a good offer.
de W8CCW in North Carolina

--
John Ferrell
http://DixieNC.US

"Steven Swift" wrote in message
...
A while back there was a 12v tube thread.

I saw this:

http://www.thamesandkosmos.com/products/ra/ra2.html

advertized in September Scientific American. The ad (on the
builditplayit.com site) says it uses a "double triode" and
requires 8-AA batteries (nominally 12V).

I wonder if it is a 12V tube kit. Perhaps a 12AE7 or similar.

Anyone know?
--
Steven D. Swift, , http://www.novatech-instr.com
NOVATECH INSTRUMENTS, INC. P.O. Box 55997
206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA