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In Reply to: No. posted by sser2 on August 11, 2006 at 19:21:55:
Not true as the "designed for series" tubes are those with controlled warm up characteristics and I've already suggested balancing resistors to equalize warm up voltages. When television took off after the second WW there were very few tubes designed for series heater strings and these were for the "all American five" type radios - nothing like a horizontal output tube or damper diode or dual diode detector, etc. But some of the first TVs used "common" tube types in a series heater string with the same balancing resistor type designs I've suggested. It was only when controlled warm up type tubes were produced - to get rid of the cost of the resistor networks - that one had to be careful not to put a non-controlled warm up tube in a heater string cuz you might shorten it's heater life.
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Follow Ups
- Re: No. - Rob Mercure 12:47:41 08/14/06 (1)
- Re: No. - Pär 23:02:10 08/14/06 (0)
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