Hi: I have a nice old Motorola 48L11 portable radio that needs a 47.5 v. B supply. I can't find the #467 battery it used and am looking for an alternative. Any help will be appreciated.
Dick

:Hi: I have a nice old Motorola 48L11 portable radio that needs a 47.5 v. B supply. I can't find the #467 battery it used and am looking for an alternative. Any help will be appreciated.
: Dick

We have, in the recent past, had quite a discussion about battery eliminators and everybody chipped in with information. My idea of the best way is to get a 28 Volt AC transformer and feeding a Voltage doubler and a filter, then regulate it down to 45 Volts with a Zener diode and a transistor, then a filter. The filament can be regulated down to1 1/2 or 3 Volts pretty easily, too. You probably get a lot of advice on this one (;>).
Lewis

If you want the radio for portable use, go to Batteries Plus. They have an ok selection of 22.5, 45, and 67.5 volt batteries. They have 22.5 volt batteries that are as small as AA cells. Wire two in series to get 45 volts. They have 45 volt batteries the width of a 9 volt, but much longer, and they also have larger 45 volt batteries with more capacity.

For home use, the battery eliminator is definitely the more economical way to go. Back when radio actually had good music playing, I really enjoyed bringing my Zenith 5-G-500 wherever I'd go. Others my age would scratch their heads, but I didn't care. I'm more about doing what I want to do and less about fitting in.

T.

:If you want the radio for portable use, go to Batteries Plus. They have an ok selection of 22.5, 45, and 67.5 volt batteries. They have 22.5 volt batteries that are as small as AA cells. Wire two in series to get 45 volts. They have 45 volt batteries the width of a 9 volt, but much longer, and they also have larger 45 volt batteries with more capacity.
:
:For home use, the battery eliminator is definitely the more economical way to go. Back when radio actually had good music playing, I really enjoyed bringing my Zenith 5-G-500 wherever I'd go. Others my age would scratch their heads, but I didn't care. I'm more about doing what I want to do and less about fitting in.
:
:T.

if you need 45 volts, you can solder 5 nine Volt transistor batteries togher, if you have room, but if you want to listen at home, I would go with an AC operated power supply.

To Thomas: Me, too. When I was a kid, we had a surplus store that had a bunch of WW II electronic stuff. We would make VHF receivers out of microwave mixer diodes and transmitters out of minature tubes and walk around talking to each other on our (illegal) walkie talkies. The neighbors looked at us and shook their heads, too, but now people can't walk 100 feet without a cell phone or bluetooth hanging from their ears. I was just about fifty years ahead of the times.
Lewis

Dick,

I believe you meant you needed a 67 1/2 volt #467 battery.

Radiodoc
**********

:Hi: I have a nice old Motorola 48L11 portable radio that needs a 47.5 v. B supply. I can't find the #467 battery it used and am looking for an alternative. Any help will be appreciated.
: Dick

:Dick,
:
:I believe you meant you needed a 67 1/2 volt #467 battery.
:
:Radiodoc
:**********
Hey, you are right, Radiodoc, I needed to read the drawing more carefully. Once again, 28 Volts times 1.414 times 2 comes up to about 79 Volts, an easy number to Zener down to 67.5. An easy way to bias a transistor to 1.5 Volts is to use silicon diodes forward biased in the base, each diode will provide about .7 Volts, so two or three, if you have to account for the emitter drop, will give you a very nice 1.5 Volt regulated current. Perhaps a center tapped transformer and a half wave rectifier feeding a regulator. Maybe another crowbar diode on the output incase of transistor failure.
Lewis

::Dick,
::
::I believe you meant you needed a 67 1/2 volt #467 battery.
::
::Radiodoc
::**********
:Hey, you are right, Radiodoc, I needed to read the drawing more carefully. Once again, 28 Volts times 1.414 times 2 comes up to about 79 Volts, an easy number to Zener down to 67.5. An easy way to bias a transistor to 1.5 Volts is to use silicon diodes forward biased in the base, each diode will provide about .7 Volts, so two or three, if you have to account for the emitter drop, will give you a very nice 1.5 Volt regulated current. Perhaps a center tapped transformer and a half wave rectifier feeding a regulator. Maybe another crowbar diode on the output incase of transistor failure.
:Lewis

Lewis,

I have an RCA BP-10 that I made a "B" battery pack for out of 7 9-volt transistor batteries. Soldered them together and taped them up to prevent shorting out in the battery area. Worked like a champ even with a few volts less than 67 volts. The 467 batteries can still be purchased but are VERY expensive. I only gave 20 dollars for the BP-10. Couldn't see paying 30 dollars for a battery.

Radiodoc
**********

:::Dick,
:::
:::I believe you meant you needed a 67 1/2 volt #467 battery.
:::
:::Radiodoc
:::**********
::Hey, you are right, Radiodoc, I needed to read the drawing more carefully. Once again, 28 Volts times 1.414 times 2 comes up to about 79 Volts, an easy number to Zener down to 67.5. An easy way to bias a transistor to 1.5 Volts is to use silicon diodes forward biased in the base, each diode will provide about .7 Volts, so two or three, if you have to account for the emitter drop, will give you a very nice 1.5 Volt regulated current. Perhaps a center tapped transformer and a half wave rectifier feeding a regulator. Maybe another crowbar diode on the output incase of transistor failure.
::Lewis
:
:Lewis,
:
:I have an RCA BP-10 that I made a "B" battery pack for out of 7 9-volt transistor batteries. Soldered them together and taped them up to prevent shorting out in the battery area. Worked like a champ even with a few volts less than 67 volts. The 467 batteries can still be purchased but are VERY expensive. I only gave 20 dollars for the BP-10. Couldn't see paying 30 dollars for a battery.
:
:Radiodoc
:**********

Doc: Consider this: the battery radio was designed to work when the batteries were getting low, so "a few Volts less than 67 volts" was within the design of the radio. I would imagine that if you used 45 Volts, it would work just fine.

Lewis

::Dick,
::
::I believe you meant you needed a 67 1/2 volt #467 battery.
::
::Radiodoc
::**********
:Hey, you are right, Radiodoc, I needed to read the drawing more carefully. Once again, 28 Volts times 1.414 times 2 comes up to about 79 Volts, an easy number to Zener down to 67.5. An easy way to bias a transistor to 1.5 Volts is to use silicon diodes forward biased in the base, each diode will provide about .7 Volts, so two or three, if you have to account for the emitter drop, will give you a very nice 1.5 Volt regulated current. Perhaps a center tapped transformer and a half wave rectifier feeding a regulator. Maybe another crowbar diode on the output incase of transistor failure.
:Lewis

Lewis,

Check this out:

http://cgi.ebay.com/vintage-tube-radio-parts-rare-choice-lot-FAIRY-STICKS_W0QQitemZ250202198797QQihZ015QQcategoryZ38033QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

And to think I have been calling these coils all these years...

Radiodoc
**********

I think that 'Dad' was a bit senile when he referred to them as 'fairy sticks.'

T.

:Dick,
:
:I believe you meant you needed a 67 1/2 volt #467 battery.
:
:Radiodoc
:**********
:You are right, Radiodoc. Sorry about the typo. It should be 67.5 volts. Dick
:
::Hi: I have a nice old Motorola 48L11 portable radio that needs a 47.5 v. B supply. I can't find the #467 battery it used and am looking for an alternative. Any help will be appreciated.
:: Dick

Hi

Eveready #467 batteries are available. AES, www.tubesandmore.com part number is S-Z467. It sells for $31.95 in their catalog.

Using 9 volt transistor radio batteries is less expensive but not original.

Norm

::Dick,
::
::I believe you meant you needed a 67 1/2 volt #467 battery.
::
::Radiodoc
::**********
::You are right, Radiodoc. Sorry about the typo. It should be 67.5 volts. Dick
::
:::Hi: I have a nice old Motorola 48L11 portable radio that needs a 47.5 v. B supply. I can't find the #467 battery it used and am looking for an alternative. Any help will be appreciated.
::: Dick