Hey all...

Been a long while since I posted here...

Anyone here have any experience with radios from the 1920's. I'm
restoring my first pre war model.

I've got a three dial five tuber neutrodyne casket radio. They use the 201A
tubes. 90 volts for the tube plates and normally powered by "b" cells and
on the "a" cell line, they take the 6.5 volts for the filaments, and 45
volts on the detector. I'm gonna juice it up with an Arbe III once I
locate a schematic and figure out what goes where.

I'm still not sure about the "neutralizing" procedure. Covering up a
filament pin and so on...

Anyone here actually ever neutralize a neutrodyne before ???

Thanx in advance...

Michael

Those old radios were not grounded.Be careful, don't let that old radio
electrocute you.

There is a newsgroup where some people work on and restore old radios.It
isn't alt.binaries.pictures.radio newsgroup, but ask those folks in
there.
cuhulin

On Thu, 12 Feb 2009 23:33:05 GMT, "Michael"
wrote:

Hey all...

Been a long while since I posted here...

Anyone here have any experience with radios from the 1920's. I'm
restoring my first pre war model.

I've got a three dial five tuber neutrodyne casket radio. They use the 201A
tubes. 90 volts for the tube plates and normally powered by "b" cells and
on the "a" cell line, they take the 6.5 volts for the filaments, and 45
volts on the detector. I'm gonna juice it up with an Arbe III once I
locate a schematic and figure out what goes where.

You might post your question on rec.antiques.radio+phono....lots of
folks there with the knowledge you're looking for.

rec.antiques.radio+phono
That is the newsgroup I was thinking about, but I couldnt remember.

I used to go there, untill they ran me out.
cuhulin

wrote:

rec.antiques.radio+phono
That is the newsgroup I was thinking about, but I couldnt remember.

I used to go there, untill they ran me out.
cuhulin


Your drunkard lifestyle and bestiality may have been contributing factors.





mike

I quote General Anthony McAuliffe.
NUTS!
cuhulin

wrote in news:14089-4994C09E-1052@storefull-
3171.bay.webtv.net:

Those old radios were not grounded.Be careful, don't let that old radio
electrocute you.

There is a newsgroup where some people work on and restore old radios.It
isn't alt.binaries.pictures.radio newsgroup, but ask those folks in
there.
cuhulin


I'm sure a battery operated radio will eletrocute someone. Why don't you
educate youeself before opening your mouth?

elaich wrote:

I'm sure a battery operated radio will eletrocute someone. Why don't you
educate youeself before opening your mouth?

You're thinking that a battery operated radio is a transistor radio. Vaccum
tubes generally use higher voltages. If you had read the original post,
you would have seen that one of the batteries was 90 volts. That's enough
to kill you if you are not careful.

Ironicaly, at about the time the transistor was invented, low voltage,
cold cathode (no heater) miniture tubes were developed. but that was 20-30
years AFTER this one was made.


That's also where the battery terms, a,b,c etc came from. An A battery
was a cathode (heater battery), a B battery was the high voltage
and a C battery was a "bias" voltage.

A batteries were generaly 1.5 volts (single carbon/zinc cells), but B
batteries ranged from 45 to 90 volts. There was a special 512v battery
used for electronic flashes in the 1950's, but I don't know if it
was called a B battery or not, I've always heard of it referred to
as a 512 volt photo battery.

It would have made a nice B battery for a small radio transmitter.

Geoff.

--
Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM

elaich wrote:
wrote in news:14089-4994C09E-1052@storefull-
3171.bay.webtv.net:

Those old radios were not grounded.Be careful, don't let that old radio
electrocute you.

There is a newsgroup where some people work on and restore old radios.It
isn't alt.binaries.pictures.radio newsgroup, but ask those folks in
there.
cuhulin


I'm sure a battery operated radio will eletrocute someone. Why don't you
educate youeself before opening your mouth?

A 90 VDC battery can delivery a lethal shock.

I've never heard/read a single thing about 1930's battery radios. The ones
I know about were all from the 1920's. They take the 201 and 301 tubes.
Most were made to take 6.5 volts for the filaments as car battery
rechargabe wets of the time were all 6.5. Here is the interesting thing.
Those tubes dont need that much juice. The rigs bump it down from 6.5.
There were some 201 and 301 tube radios that have direct voltage to the
tubes. If you hook up 6.5 volts to the filaments, kiss the tubes goodbye.

I'm still trying to figure out what to do with this King-Hinnes Silvertone
Neutrodyne that I have here. The manual I have that may very well be a "one
size fits all" calls for 3 "A" cells. That would mean about 4.5 volts.

I'm gonna juice it up soon. I'm not sure if either the tubes or the
transformers are good. The speaker horn is at least good as I can hear a
click when I give it low voltage.

Michael

"norml" wrote in message
...
I have an eight-tube, RCA portable from 1930 that requires 180V on the
plates. It was originally supplied by four 45V batteries. I built a wooden
jig to hold 20 9V batteries. It looked so harmless--until my finger
brushed
across the output terminals.

Norm

(Geoffrey S. Mendelson) wrotf:

elaich wrote:

I'm sure a battery operated radio will eletrocute someone. Why don't you
educate youeself before opening your mouth?

A batteries were generaly 1.5 volts (single carbon/zinc cells), but B
batteries ranged from 45 to 90 volts. There was a special 512v battery
used for electronic flashes in the 1950's, but I don't know if it
was called a B battery or not, I've always heard of it referred to
as a 512 volt photo battery.

It would have made a nice B battery for a small radio transmitter.

Geoff.