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#9
April 4th 07, 09:46 PM
posted to rec.antiques.radio+phono,rec.audio.tubes,rec.radio.amateur.homebrew,sci.electronics.components
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811A's, Dual Grid and Class B triodes
"RapidRonnie" wrote in message ups.com... On Apr 2, 8:53 am, "Ed Engelken" wrote: Googling the term, I see that the 52 tube seems to be an example where both grids are brought out to individual terminals. ======================================= The #46 is another. The 46 was popular in a number of A****er Kent radios circa 1932-33. Class B Push-Pull output stages in high-end radios had a brief run in the early 1930s, then faded into history. -- Ed Because using conventional circuits the distortion was terrible. True Class B operation works well only at high continuous levels without extreme measures such as Wiggins and Mcintosh/Gow/Corderman afforded. Al Bereskin at Baldwin designed the "poor man's Mc" for organ use and it was published in an extremely good DIY article in the IRE journal in '55 or '56. It never got below 2% THD. Most of those sets used push-pull class A, not B. Pete |
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