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#13
February 14th 09, 03:01 PM
posted to rec.radio.shortwave
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1920's radios ???
Michael wrote:
"Brenda Ann" wrote in message ... "Michael" wrote in message ... 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. 01A/201/301/etc. used 5V filaments. Many radios using these tubes ran 6.5/6.6V auto batteries and had an adjustment to allow for voltage to the filaments to be varied so that as the battery ran down, you could turn the voltage back up a bit, thereby getting longer use out of a charge of the battery. I was mistaken about those tubes, then... I thought the 01A filaments took less then 5 volts. Michael http://www.xs4all.nl/~tgale/oradio/faq3.html |
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