[RodB]

This past week I did a quick recap and repair of this 7 tube Coronado 1682. Also fixed the loose veneer on the top right rear corner and constructed a back with loop antenna from a scrap piece left over from a TV set. Has 2 bands and 3 tone settings. Nice SW spread from 9 to 12 MHz. Another one saved from the scrap pile. Owner and wife are very happy.
   
   

[radiorich]

Hello rod,
What nice little set it reminds me of some those Philco and RCA sets in the little wooden cabinets !

Sincerely Richard

[Paul Philco322]

Other than the square antenna the case loks very RCA like a 28X.......and the RCA 28X was AC/DC. Yours looks like a transformer in there.
[Image: https://i.etsystatic.com/17379717/r/il/e...3_3tn2.jpg]

[MrFixr55]

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!