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 Post subject: AC DC Start of production
PostPosted: Jul Thu 18, 2019 8:27 pm 
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Does anyone know when the first AC DC radio was sold and who made it?


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 Post subject: Re: AC DC Start of production
PostPosted: Jul Thu 18, 2019 8:50 pm 
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From Antique Radio Classified magazine November 1996 Vol.-13 No.-11
Image
Sadly, Alan passed in November 2015
viewtopic.php?f=2&t=288153

Greg.

Edit: the Radio Retailing Ad. (one-page).
http://americanradiohistory.com/hd2/IDX ... e-0056.pdf

search all issues→ https://www.americanradiohistory.com/hd ... search.cgi
use inverted commas for exact phrase... :)


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 Post subject: Re: AC DC Start of production
PostPosted: Jul Thu 18, 2019 9:35 pm 
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Some give the claim to the International Kadette, which had the same tube lineup. Maybe Alan V. knows it's date of introduction.

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 Post subject: Re: AC DC Start of production
PostPosted: Jul Thu 18, 2019 10:29 pm 
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Up to only recently I thought AC/DC sets were plug-in or battery. A repairman friend reminded me that "DC" operation and "battery" operation are two different things. I still don't completely understand.


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 Post subject: Re: AC DC Start of production
PostPosted: Jul Thu 18, 2019 10:46 pm 
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Quote:
"DC" operation and "battery" operation are two different things. I still don't completely understand.

An AC/DC radio is usually a transformerless radio, it can operate on 110 VAC or 110 VDC. Early in the 1900's some areas had only DC at 110 volts.
Many later radios were built without transformer to save cost, even tho no one had DC at home anymore, still were labeled as AC/DC..
Now early radios labeled as AC/DC could run on a 110 volt battery, but these were impractical. So battery operated sets usually ran on two sets of batteries, 1.5V dry cell and a B+ battery usually around 67V.

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Last edited by pauls.ironhorse on Jul Thu 18, 2019 10:51 pm, edited 1 time in total.

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 Post subject: Re: AC DC Start of production
PostPosted: Jul Thu 18, 2019 10:49 pm 
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decojoe67 wrote:
Up to only recently I thought AC/DC sets were plug-in or battery. A repairman friend reminded me that "DC" operation and "battery" operation are two different things. I still don't completely understand.

There were some houses in the US still using DC power (from the utility) well into the 20th century. ConEd started to eliminate DC service in New York in 1998.


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 Post subject: Re: AC DC Start of production
PostPosted: Jul Thu 18, 2019 10:57 pm 
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There were a few radios designed to operate from DC mains; the Philco 46 is one example.

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 Post subject: Re: AC DC Start of production
PostPosted: Jul Thu 18, 2019 11:15 pm 
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A radio (usually a portable) that could operate on 120 VAC, 110 VDC, or batteries was called a "3 way radio". The batteries were usually 7.5 or 9 volts for the A supply and 90 volts for the B supply. The tube filaments (except for the rectifier heater) were connected in series. This presented biasing problems so AVC was applied to only one tube. The audio output tube was at the "high" end of the string and used the voltage drop in the other filaments for bias. The plate current of the output tube flowed through the filament string and required resistors across the filaments at the "low" end to keep from overloading them.

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 Post subject: Re: AC DC Start of production
PostPosted: Jul Thu 18, 2019 11:19 pm 
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String nine 12 volt gel cell batteries together and you will have 113.4 volts to run an AA5 or such. :D

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 Post subject: Re: AC DC Start of production
PostPosted: Jul Fri 19, 2019 1:18 am 
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Not for long, unless you have big honkin batteries. That filament string eats alot of watts. Not to say it does not work in theory, practice is more expensive!

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 Post subject: Re: AC DC Start of production
PostPosted: Jul Fri 19, 2019 1:35 am 
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decojoe67 wrote:
Up to only recently I thought AC/DC sets were plug-in or battery. A repairman friend reminded me that "DC" operation and "battery" operation are two different things. I still don't completely understand.

There was a time when some cities provided ~110V DC (direct current) power while others provided AC (alternating current). Incandescent light bulbs don't care, so it didn't matter. But it does matter for radios; so some radios were made that would be compatible with both AC and DC power systems. Over time, household power became standardized with AC.


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