SX250/CX350 Tube Testing

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SX250/CX350 Tube Testing

Post by shunkpenn on Sat Oct 29, 2016 3:06 pm

I have a bunch of CX,SX prefix tubes that I have no test setting that match my tester. Wondering if the 250 and 350 test like any regular type 50 tube. Also have problems with the CX 345 and SX200A. Thanks for the help.

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Re: SX250/CX350 Tube Testing

Post by Bill Cahill on Sat Oct 29, 2016 3:14 pm

Yes, they would Large tube, four pins.
Used in a number of radios, incldung one model of Edison radio, and, a couple of models of Majestic radio phonographs from 1928.

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Re: SX250/CX350 Tube Testing

Post by shunkpenn on Sat Oct 29, 2016 3:37 pm

Thanks Bill...what abt the 345's and 200A's.

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Re: SX250/CX350 Tube Testing

Post by Bill Cahill on Sat Oct 29, 2016 5:17 pm

345 Is also cx 345, and, 45.
The 200 A is the closest match . I think, to 01, a, 201, . 301.
200 was used in some of the battery sets for a special purpose, such as detector. The 45's were used in 20' vintage a c operated radios, and,one company used 45's in ouput stage of disc recorders in the fourties , through fifties. They wanted to have clean sound. Presto was the companies. It was a very heavy portable recorder, and, player. Anyone have one they would trade, or, sell cheap? I've been looking for years.s

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