08-19-2018, 03:02 PM
Hellow from Spain 
Some body knows something about this small ac/dc tombstone under license RCA?
I fixed it and it’s working but i’m looking for the schematic to understad what kind of circuit it is (and how it works).
Some info and photos:
[Image: http://thumbs.subefotos.com/cd805be12a22...ce2d1o.jpg] [Image: http://thumbs.subefotos.com/9b3e71f3593a...31b52o.jpg] [Image: http://thumbs.subefotos.com/a072bcf6564f...4fffbo.jpg]
[Image: http://thumbs.subefotos.com/8162cf50a9c0...42fa8o.jpg] [Image: http://thumbs.subefotos.com/bd5474d683f0...34d0bo.jpg] [Image: http://thumbs.subefotos.com/0a0fd59a3401...29583o.jpg]
[Image: http://thumbs.subefotos.com/53003dcf68f2...871d2o.jpg] [Image: http://thumbs.subefotos.com/fb741d1e84c0...54d10o.jpg] [Image: http://thumbs.subefotos.com/e570c6e8260e...689b3o.jpg]
[Image: http://thumbs.subefotos.com/d6a4fc5d0c90...71f63o.jpg]
Broadcast and Long Wave bands.
three-section tuning condenser.
Paper "CuB" capacitors.
Tube line-up is 25Z5, 43, 77, 78, 6A7 and a 6,3V 0,3A bulb on the scale dial.
Electrodynamic speaker.
It had a resistance line cord, replaced time ago with a non polarized capacitor.
I think it is an RCA’s kit, or at least the circuit.
There isn't any paper label into the cabinet.
“Licensed under patents of the Radio Corporation of America and Associated Companies, only for radio amateur, experimental and broadcast reception … Serial number 64256. Made in U.S.A.”
It is a very strange radio to me.
Before i started to fix it, i thougth it was a classic superhet but it seems to have only one I.F. transformer (No Second I.F. transformer under or above the chassis, i think).
On the top of the chasis there is a little unshielded transformer conneted to the 77…
There are two trimmers near the band selector (well).
One padder at the chassis’s back (well).
Only one trimmer in the chassis’s back asociated to the little unshielded transformer conneted to the 77…
Ah! It haven't AVC circuit, at 02:00 A.M. strong stations are a problem
Some times i think this radio is something like an “AC/DC 84B” with an RF amplifier stage
Thank you very much
Some body knows something about this small ac/dc tombstone under license RCA?
I fixed it and it’s working but i’m looking for the schematic to understad what kind of circuit it is (and how it works).
Some info and photos:
[Image: http://thumbs.subefotos.com/cd805be12a22...ce2d1o.jpg] [Image: http://thumbs.subefotos.com/9b3e71f3593a...31b52o.jpg] [Image: http://thumbs.subefotos.com/a072bcf6564f...4fffbo.jpg]
[Image: http://thumbs.subefotos.com/8162cf50a9c0...42fa8o.jpg] [Image: http://thumbs.subefotos.com/bd5474d683f0...34d0bo.jpg] [Image: http://thumbs.subefotos.com/0a0fd59a3401...29583o.jpg]
[Image: http://thumbs.subefotos.com/53003dcf68f2...871d2o.jpg] [Image: http://thumbs.subefotos.com/fb741d1e84c0...54d10o.jpg] [Image: http://thumbs.subefotos.com/e570c6e8260e...689b3o.jpg]
[Image: http://thumbs.subefotos.com/d6a4fc5d0c90...71f63o.jpg]
Broadcast and Long Wave bands.
three-section tuning condenser.
Paper "CuB" capacitors.
Tube line-up is 25Z5, 43, 77, 78, 6A7 and a 6,3V 0,3A bulb on the scale dial.
Electrodynamic speaker.
It had a resistance line cord, replaced time ago with a non polarized capacitor.
I think it is an RCA’s kit, or at least the circuit.
There isn't any paper label into the cabinet.
“Licensed under patents of the Radio Corporation of America and Associated Companies, only for radio amateur, experimental and broadcast reception … Serial number 64256. Made in U.S.A.”
It is a very strange radio to me.
Before i started to fix it, i thougth it was a classic superhet but it seems to have only one I.F. transformer (No Second I.F. transformer under or above the chassis, i think).
On the top of the chasis there is a little unshielded transformer conneted to the 77…
There are two trimmers near the band selector (well).
One padder at the chassis’s back (well).
Only one trimmer in the chassis’s back asociated to the little unshielded transformer conneted to the 77…
Ah! It haven't AVC circuit, at 02:00 A.M. strong stations are a problem
Some times i think this radio is something like an “AC/DC 84B” with an RF amplifier stage
Thank you very much
