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 Post subject: a b c battery eliminator subsitute
PostPosted: Dec Mon 25, 2017 1:53 am 
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Joined: May Wed 11, 2016 2:18 am
Posts: 70
Location: springvalley ohio
I know antique radio and arb has a current models, I assume there where earlier models maybe even from the individual manufacturer themselves. .I would like to know where I can find info on those and maybe even aftermarket units made for them. I would appreciate any web sirs ,schematics, etc..
Thanks
Doug


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 Post subject: Re: a b c battery eliminator subsitute
PostPosted: Dec Mon 25, 2017 2:17 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: S. Dartmouth MA 02748-1225 USA
The Majestic B and Majestic Super B, ACME, Atwater-Kent. KoKoMo all made "B" supplies.

Exide made a "A-B" model where the "A" was an enclosed lead battery with a charger.
Those are the ones I recall, there are many mode. Many "B" supplies used the "B" or "BH" gas rectifier and had variable controls for the detector and amplifier B voltages, the power output tube was usually fixed at 135 or more volts.

I cannot recall a full feature "A-B-C" supply, the "C" generally did not actually run down in service, just dried out.

For farm radios that came later, Silvertone (Sears) made a "A-B" eliminator.

I assume you are looking for an original eliminator rather than the ARBE-III or the AES breadboard kit eliminator.

The Majestic and the ACME schematics should be in Riders, possibly the A-K and KoKoMo.

They are all pretty much the same electrically. All used power transformers, some the gas rectifier others an 80. Most have paper capacitors. The variable controls are a bit unusual, carbon pile rheostats...

I used Majestic to power my sets, they came with an estate acquisition many years ago.

/viewtopic.php?f=6&t=210980&start=0

http://www.antiqueradios.com/forums/vie ... 6&t=239168

Chas


Last edited by Chas on Dec Mon 25, 2017 2:34 am, edited 1 time in total.

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 Post subject: Re: a b c battery eliminator subsitute
PostPosted: Dec Mon 25, 2017 2:25 am 
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Does anybody know if the gas rectifier is still available?


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 Post subject: Re: a b c battery eliminator subsitute
PostPosted: Dec Mon 25, 2017 4:06 am 
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Joined: May Wed 11, 2016 2:18 am
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Location: springvalley ohio
Appreciate the above info.
Is the gas rectifier just refered as a BH or is there another reference?


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 Post subject: Re: a b c battery eliminator subsitute
PostPosted: Dec Mon 25, 2017 6:35 am 
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Location: Roslyn,Pa 19001
I think there also called cold cathode rectifiers as they don't sport a filament. A newer version would be a 0Z4. It was mostly used in car radios in the late 40's and 50's.

Terry


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 Post subject: Re: a b c battery eliminator subsitute
PostPosted: Dec Mon 25, 2017 4:44 pm 
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Location: S. Dartmouth MA 02748-1225 USA
dougmc wrote:
Appreciate the above info.
Is the gas rectifier just referred as a BH or is there another reference?
FWIR the "B", also a gas rectifier was a higher current version, intended for those supplies designed for it. The gas molecule is tiny, over the years, these tubes often fail because of a reduction of the gas. The "BH" can still be found NIB but should be tested before acceptance. The "BH" can be replaced with a pair of diodes and a series load resistor all in a tube base. As said in one of my posts on the Majestic supply, an experiment with diodes failed because of the lack of a series resistor.

The "BH" is hidden within the supply and its construction is such that even in normal operation there is no "display". Some evidence may show through seams in the cathode cover.

I might mention RCA made a power supply the Duo-Rectron AP-937, see this very old post:

http://www.antiqueradios.com/forums/vie ... hp?t=36103

http://www.nostalgiaair.org/PagesByMode ... 040283.pdf

The AP-937 was designed to provide "B" battery voltages of 22, 45, 90, and 135 volts for receivers of any size up to 10 tubes, it is regulated for the 90 volts, an advantage for varying line conditions. The 90 volts in most 20's receivers powers the RF and 1st AF tubes. The rectifier, tube and the regulator do have a visible glow :)

A few other power supplies:

USL Model RB-135 Socket B Power

Philco Radio AB Socket Power type AB356

Chas


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 Post subject: Re: a b c battery eliminator subsitute
PostPosted: Dec Mon 25, 2017 5:02 pm 
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I have a Majestic Super-B in reasonably good shape, even includes the lid, but I could never find a tube for it, so I never messed with it.


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 Post subject: Re: a b c battery eliminator subsitute
PostPosted: Dec Mon 25, 2017 5:54 pm 
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Location: Medford OR
Have you seen one of the Kolster sets that almost always has broken/cracked pot metal. There is little chance of finding replacement parts, so I usually part them out. One of the useful pieces is the power supply.

In the video below the Kolster PS is behind the Remler Super. I have added a DC filament supply that is variable and can supply about 1.5A, but, there are battery input/charging terminals that can be used to provide additional filament supply - such as was necessary for this 10 tube radio. After use, the supply can recharge the battery - if used.

I also added both voltage and current metering for all B+ and filament voltages. This is really nice when working on a radio to see current consumption at 25, 45, 90 and 130V - switched. There is also a C- supply.

The 80 (UX280) was replaced with sand. This gave me room for the fil supply and C supply.

Scroll down to video -

https://www.russoldradios.com/blog

_________________
"I just might turn into smoke, but I feel fine"
http://russoldradios.com/


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 Post subject: Re: a b c battery eliminator subsitute
PostPosted: Dec Mon 25, 2017 6:24 pm 
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Sol wrote:
I have a Majestic Super-B in reasonably good shape, even includes the lid, but I could never find a tube for it, so I never messed with it.
Uses the "BH" gas rectifier.

As I stated BH are still around but most tube testers will not test.

Diodes can be used to replace the BH but use a series resistor between the cathodes and the filter input. I cannot give a value for the resistor. The resistor can be placed within the tube base with the diodes. Sometimes diodes will create noise, bypass each diode with a .001 ceramic, again, within the tube base.

As said I tried, without a resistor, the surge shorted the input choke to the frame :shock:


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 Post subject: Re: a b c battery eliminator subsitute
PostPosted: Dec Mon 25, 2017 6:28 pm 
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Joined: May Sat 30, 2015 11:49 pm
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Location: Keystone Heights, FL, USA
Maybe these are what the OP is interested in?
Here are some of the B/C eliminators that I have. Still need an "A" battery.
These first two use the BH tube; sometimes this tube is just called a "Raytheon" during this early time. The tube can be seen down inside on the right.
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For something a bit more primitive, a Philco A/B eliminator. Actually it is an "A" battery charger combined with a "B" battery eliminator. When switched OFF it charges the A battery. When switched ON it turns off the battery charger and sends A voltage to the output posts from the battery, which would be inside the unit in the empty space on the right side. The "B" voltage comes from a four electrolytic rectifiers, the jars seen across the back.
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Jeff


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 Post subject: Re: a b c battery eliminator subsitute
PostPosted: Dec Mon 25, 2017 6:41 pm 
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Location: S. Dartmouth MA 02748-1225 USA
Jeff,

Got yourself a nice collection of eliminators!

I got an Exide, about 6 Majestics, the RCA, the KoKoMo and an ACME. I see at least two of yours have a "C" tap, nice...

Another forgotten radio collectible, related, is the stand alone "A" battery transfer relay, I have but one but can't find it at the moment to give a name.

When considering setting up a "real" 20's battery radio there was a lot of "stuff" involved.

It's no wonder folks embraced the AC radio despite its hum and weight...


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 Post subject: Re: a b c battery eliminator subsitute
PostPosted: Dec Tue 26, 2017 3:27 am 
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Chas wrote:
Sol wrote:
I have a Majestic Super-B in reasonably good shape, even includes the lid, but I could never find a tube for it, so I never messed with it.
Uses the "BH" gas rectifier.

As I stated BH are still around but most tube testers will not test.

Diodes can be used to replace the BH but use a series resistor between the cathodes and the filter input. I cannot give a value for the resistor. The resistor can be placed within the tube base with the diodes. Sometimes diodes will create noise, bypass each diode with a .001 ceramic, again, within the tube base.

As said I tried, without a resistor, the surge shorted the input choke to the frame :shock:

Thanks Chas. I appreciate the information. I have to say though that in the intermediate years I have kind of taken a main interest in 50's radios. I will probably just pass it on to someone who can use it at some point.


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 Post subject: Re: a b c battery eliminator subsitute
PostPosted: Dec Tue 26, 2017 4:26 am 
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Joined: May Wed 11, 2016 2:18 am
Posts: 70
Location: springvalley ohio
I would be interested in the majestic when you are ready to part with it
Doug


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 Post subject: Re: a b c battery eliminator subsitute
PostPosted: Dec Tue 26, 2017 5:03 am 
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dougmc wrote:
I would be interested in the majestic when you are ready to part with it
Doug

I'll let you have it for shipping, but I recently moved and I would have to find it. PM me your agreement as a reminder.


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 Post subject: Re: a b c battery eliminator subsitute
PostPosted: Dec Wed 27, 2017 2:21 am 
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Joined: May Wed 11, 2016 2:18 am
Posts: 70
Location: springvalley ohio
Pm sent...
I'm still finding things after 3 moves in 30 years...
Thanks

Doug


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 Post subject: Re: a b c battery eliminator subsitute
PostPosted: Dec Sun 31, 2017 6:15 pm 
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'When I finished repairing and re-capping my ZTO H500 several months ago, and I wanted a "More" economical way to power it when used as a portable radio. I didn't like the idea of having to buy numerous 9 volt batteries, plus additional "D" or "C" cells. So I found and assembled an economical alternative that allows me to use either 8 "D" cells in a holder or any Amp-Hour suitable 12 volt battery source, including small 12 volt rechargeable sealed lead-acid or gel-cells. The Battery Eliminator is made from two, pre-existing, pre-assembled components and a simple 9 volt regulator circuit, you can assemble yourself or buy one as a third pre-assembled unit ( Your option, as you wish ). I've tested it, it works, with no interference and even cuts out any 60 cycle hum like may be experienced from 120 volt line wall outlets. Allows operation, just like a battery. Total parts cost was around ~$ 100.00.'


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