06-19-2015, 11:46 PM
Here are excerpts from the early RCA tube manual. It looks like they were trying to sell the DC filament feature.
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Use of RCA 237 Tubes in Radio with AC Powered Filiments
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Use of RCA 237 Tubes in Radio with AC Powered Filiments - by Phlogiston - 06-19-2015, 07:24 PM
RE: Use of RCA 237 Tubes in Radio with AC Powered Filiments - by Ron Ramirez - 06-19-2015, 08:13 PM
RE: Use of RCA 237 Tubes in Radio with AC Powered Filiments - by codefox1 - 06-19-2015, 08:43 PM
RE: Use of RCA 237 Tubes in Radio with AC Powered Filiments - by Arran - 06-19-2015, 09:47 PM
RE: Use of RCA 237 Tubes in Radio with AC Powered Filiments - by Phlogiston - 06-19-2015, 11:46 PM
RE: Use of RCA 237 Tubes in Radio with AC Powered Filiments - by TA Forbes - 06-21-2015, 11:54 AM
RE: Use of RCA 237 Tubes in Radio with AC Powered Filiments - by mikethedruid - 06-23-2015, 11:48 AM
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