Anybody know any tubes...st or gt shape preferred that will work on 12
volts plate voltage for small 1 tube regens...possibly a stage or two
of amplification also.

I know there were automobile radio tubes made that didnt need vibrators
but dont know any numbers myself.

wrote:
Anybody know any tubes...st or gt shape preferred that will work on 12
volts plate voltage for small 1 tube regens...possibly a stage or two
of amplification also.

I know there were automobile radio tubes made that didnt need vibrators
but dont know any numbers myself.

I found regular plain old receiving tubes worked OK down to 18 volts on
the plates - didn't have any convenient way of getting 12 at the time
but I'll bet they would have worked.

Audio power amps had REALLY low output but if you're building a 1-tube
regen you're not driving a speaker anyway...

--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com

I think some early Motorola auto radios worked off DC directly and had
tubes in the RF and transistor audio PA's. You might look for some
vintage auto radio schematics for tube numbers. I thing the 12AX7 tube
might be included.

wrote:

Anybody know any tubes...st or gt shape preferred that will work on 12
volts plate voltage for small 1 tube regens...possibly a stage or two
of amplification also.

I know there were automobile radio tubes made that didnt need vibrators
but dont know any numbers myself.




--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money" ;-P

Hi: in this site have good information over space charge mode function in
conventional tubes (no special for 12 v).- This mode permit work the tubes
with low voltagfe in plate.

http://www.duntemann.com/12vtubes/12vtubesindex.htm

In the followings sites have a receiver projetc with 6BA6 tubes working with
12 V in plate.-
http://www.qsl.net/kl7h/GlowBug.htm

http://www.qsl.net/kl7h/12v.htm

REgards from Argentina

Heriberto
LU6DBU


escribió en el mensaje
ups.com...
Anybody know any tubes...st or gt shape preferred that will work on 12
volts plate voltage for small 1 tube regens...possibly a stage or two
of amplification also.

I know there were automobile radio tubes made that didnt need vibrators
but dont know any numbers myself.




Inviato da X-Privat.Org - Registrazione gratuita http://www.x-privat.org/join.php

hI:
I forgoten this site also ;

http://www.oldradios.co.nz/hikers/

Regards

Heriberto
LU6DBU

escribió en el mensaje
ups.com...
Anybody know any tubes...st or gt shape preferred that will work on 12
volts plate voltage for small 1 tube regens...possibly a stage or two
of amplification also.

I know there were automobile radio tubes made that didnt need vibrators
but dont know any numbers myself.




Inviato da X-Privat.Org - Registrazione gratuita http://www.x-privat.org/join.php

Heriberto wrote:
hI:
I forgoten this site also ;

http://www.oldradios.co.nz/hikers/

Regards

Heriberto
LU6DBU

I second this one. I've built 3 Hikers, bcb and sw...one is featured on
the site...and they have been excellent rcvrs for low voltage. The
later version using 3Q5s also works very well.

-Bill

there was a menufacturer here in 4Zulu land who made suck radios. I
think I have the schematic at home: i'll look itup this evening. I
think one of them was 12k7.
Actually I had that readio for years. I can't remember what became of
it.
Saandy 4Z5KS

FYI,

The tubes designed to work on 12 v for the plate might be best, but there
are a number of battery filament tubes that also migh give you some
results. eg. 1L4,1T4,1U4,1R4,1R5, etc (all 7 pin miniatures). (there was a
series of 8 pin octal tubes, too). Most of them ran filament voltages of
1.4 volts at 50 ma current. I built a audio oscilator with a 1T4 (pentode)
as a kid and it would oscilate down to 7 volts on the plate!! Most of those
tubes were designed for up to 90 v on the plate. Power audio tubes were like
3S4, 3Q4, 3A4, etc (which would run 3.0 v at 50 ma, or center taped filament
at 1.4 v and 100 ma). The 3A4, pentode, as RF amplifier was good for
something like 1/2 watt output or so, not bad for QRP and no transistors.

There was an older series of battery fillament tubes, designed for lead
acid cells (all were 2.0 v on filaments and not much amperage, either).
You'll have to consult an older tube manual for those if you want to try
them.

===== no change to below, included for reference and context =====

On Sun, 7 May 2006, wrote:

Anybody know any tubes...st or gt shape preferred that will work on 12
volts plate voltage for small 1 tube regens...possibly a stage or two
of amplification also.

I know there were automobile radio tubes made that didnt need vibrators
but dont know any numbers myself.

See down a bit....

On Mon, 8 May 2006, wrote:

On Mon, 8 May 2006 15:39:18 -0400, Straydog wrote:


FYI,

The tubes designed to work on 12 v for the plate might be best, but there
are a number of battery filament tubes that also migh give you some
results. eg. 1L4,1T4,1U4,1R4,1R5, etc (all 7 pin miniatures). (there was a
series of 8 pin octal tubes, too). Most of them ran filament voltages of
1.4 volts at 50 ma current. I built a audio oscilator with a 1T4 (pentode)
as a kid and it would oscilate down to 7 volts on the plate!! Most of those
tubes were designed for up to 90 v on the plate. Power audio tubes were like
3S4, 3Q4, 3A4, etc (which would run 3.0 v at 50 ma, or center taped filament
at 1.4 v and 100 ma). The 3A4, pentode, as RF amplifier was good for
something like 1/2 watt output or so, not bad for QRP and no transistors.

Yep used them and the 3s4 is very happy with 18V (two 9v batteries)
and makes a near optimum regen at 27V (three 9v batteries).

I'd already mentioned the 1ad4 and 5678 these are hearing aid tubes
that are very small with 1.4V 50ma filaments. They work very well
with 22.5V so 18 to 27 V is both easy and work well for them.

Common tubes like the 6ba6, and many of the other AA5 (6be6, 6ba6,
6av6 and they 12V versions) all work well at far less than 100V and
save for the audio ouput tube (50C5) ran fine at 18V.

For an oddball there is the 8058 a 12V nuvister that made a fine
VHF osc, amp or mixer.

There was an older series of battery fillament tubes, designed for lead
acid cells (all were 2.0 v on filaments and not much amperage, either).
You'll have to consult an older tube manual for those if you want to try
them.

Your thinking of #30, 31, 32 and 45.

Nah, don't have to go back that far. I got a RCA tube manual copyright
1960, and it shows, for example, 1D5-GP, 1G5-GT, 1D7-G, 1E7-GT, 1F4,
1F5-G, 1F6 as all 2.0 volt filament tubes, and most of them are octal
bases, and one or two are 5 or 6 pin non-octals. And, I also know there
were a couple numbers not made by RCA, but I spend most of my time with my
nose in the RCA manual.

And, I'm having a lot of fun in my early retirement years building a whole
(retro) tube station from partly the junkbox, partly surplus, partly new,
partly Radio Shack parts. But, I didn't know too much about the 12 v plate
tubes although I knew they existed. So, after this year's recent posts, I
started looking up the 12??blah-blah numbers in that tube manual and there
is a lot there. Now gotta decide if I want to go that route or stay with
the 1L4, 1R5, 1U4, 1T4, etc., route or use 6.3 v fil-cathode tubes with
100-200 v on plate. Part of me likes the idea of octal tube bases because
they are so much easier to put into and take out of sockets (because of
the keyed pin). Couple times in my life I dinged up pins on miniature
tubes because I didn't look carefully at the pins on the tubes and the
holes on the socket to line them up. Seems neater to have the keyed post;
just aim the center of the post for the big hole, and then spin it around
till it pops in. :-)

1.4 v filament tubes wouldn't throw a lot of heat in the summer time,
either. If I built both kinds of rigs/receivers, I guess I could use the
"hot" rig in the winter as extra heat for the room. And, the "cool" rig in
the summer. ;-)

Thanks for your comments, otherwise.

===== no change to below, included for reference and context =====



===== no change to below, included for reference and context =====

On Sun, 7 May 2006, wrote:

Anybody know any tubes...st or gt shape preferred that will work on 12
volts plate voltage for small 1 tube regens...possibly a stage or two
of amplification also.

I know there were automobile radio tubes made that didnt need vibrators
but dont know any numbers myself.

ORIGINAL MESSAGE:

On 7 May 2006 14:26:04 -0700, wrote:


Anybody know any tubes...st or gt shape preferred that will work on 12
volts plate voltage for small 1 tube regens...possibly a stage or two
of amplification also.

I know there were automobile radio tubes made that didnt need vibrators
but dont know any numbers myself.

*********** REPLY SEPARATOR ***********

My first job right out of high school in 1959 was repairing car
radios, just when the 12-volt anode tubes were coming out. On a whim,
I replaced some of the 12-volt anode types with conventional tubes
such as the 12AU6 and 12BA6 and to my surprise, they worked fairly
well, but with slightly lower gain. (The pin connections were the
same.)

BTW, the 12-volt anode types were notorious for developing
microphonics. It was an interesting design, but as soon as good
transistors became available, they became history.

In other words, don't be afraid to experiment.

Bill, W6WRT