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Coronado 1682
MrFixr55
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#4

03-06-2023, 11:27 PM
Very interesting schematic, definitely not an RCA. I don't think that RCA built OEM Radios for Tire and Department Stores. Coronado (Gamble Skogmo) radios were built by several companies, probably Wells-Gardner, Belmont, Warwick, Detrola, Colonial, Arvin and Kingston Radio Corp.

This radio does have a power transformer with the usual center tapped HV secondary and 2 filament secondaries. One is for the 6X5 rectifier, but the other secondary is for a series 150mA string for a 35L6, 12SQ7, 4 12SK7s and a 12SA7 for a total of 107V. Stranger yet is what these tubes are used for. One 12SK7 is a typical RF Amp, one is a typical IF amp, one is used as the local oscillator and the 4th 12SK7 is wired as a diode as a detector! They must have gotten a deal on 12SK7s!
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
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Messages In This Thread
Coronado 1682 - by RodB - 03-06-2023, 09:23 AM
RE: Coronado 1682 - by radiorich - 03-06-2023, 10:08 AM
RE: Coronado 1682 - by Paul Philco322 - 03-06-2023, 09:24 PM
RE: Coronado 1682 - by MrFixr55 - 03-06-2023, 11:27 PM



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  1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Other Radios (Non-Philco)