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Coronado Radio-Phonograph Model 43-7651 Series A
#2

Hi Daved, U must have gotten a "twofer"  Schematic below.  This is also a rather neat radio, as it has several shortwave bands, and the push-pull 41s will put out a rather clean 5 watts.

Coronado was the house brand of the Gamble-Skogmo department store chain.  The radio is likely built by Detrola Radio and TV, Wells Gardiner, Belmont or Arvin.  Based on the circuit, I am betting Detrola.  The radio was likely from the upper Midwest.  Not the radio stations that start with K (west of Mississippi River) and C (Canada) as well as W (east of Mississippi River)

Schematic below (Courtesy of Nostalgia Air):
.pdf Coronodo 43-7651.pdf Size: 290.75 KB  Downloads: 123


Like stated in my post about your GE, please ensure that you replace all capacitors, especially the electrolytic filter caps.
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[b]DavidK[/b] 
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[b]#1[/b]

1 hour ago

I recently acquired this unit (see attachments) and want to know where best to get insight and assistance for it.  The bonus was it came with two small USA flags (with 48 stars in the blue field), two Wheat Pennies, and 3 records (including a very thick Edison and another one that is probably on the Banned LP List).   [Image: https://philcoradio.com/phorum/images/sm...on_shh.gif]


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[b]David[/b] 
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[b]#2[/b]

1 minute ago

Nice looking set will link to some info. Check the pennies dates might have some value  http://www.nostalgiaair.org/Resources/641/M0007641.htm.

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[b]MrFixr55[/b] 
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[b]#3[/b]

Less than 1 minute ago

Hi David 

This is a rather neat Unit.  This is likely equipped with a GE "RPX" Phono Cartridge.  This was the next best thing to a true "Hi Fi" cartridge in the late 1940s. IMHO, this cartridge performs much better than a crystal or ceramic cartridge.  I have not heard the Philco BOL (Beam of Light) cartridge but it, too, shoud have lower distortion than a crystal or ceramic cartridge.  Stylus for this cartridge are still available.  I do not know whether your turntable is 78RPM or 3 speed (or 4 Speed).  Post a pic for it.  Magnetic cartridges of this vintage put a smaller signal than crystal or ceramic cartridges, hence, they require a preamplifier.  The upside down chassis below the radio chassis is the phono preamp.

Interestingly, the first electronic phono pickups back in the late 20s / early 30s were also magnetic. They put out a higher signal, but were very heavy and still used the same steel needles as the original victor diaphragm "sound box" acoustic pickup.

The Edison record will fit the turntable, and you can likely hear the record faintly at the turntable but will not hear sound from the speaker.  that is because Edison records do not move the needle left and right, they move the needle up and down.  Victor, Columbia and everyone else move the needle left and right. I am ot sure if this was to get around Edison patents. In addition, the Edison "sound box" had a saphire needle that was much more advanced than the Victor steel needles and tracked somewhat lighter. (The Victor put the full weight of the swivel portion of the tone arm and the sound box on the record.

Attached below is the schematic for this Unit, courtesy of Nostalgia Air:
[Image: https://philcoradio.com/phorum/images/at...es/pdf.gifGE 326 Radio Phono.pdfSize: 216.49 KB  Downloads: 0


Before powering up the radio, the electrolytic filter capacitors must e replaced.  It is also very important to replace all other paper /foil capacitors.  We can help you with information on how to do this.  There should also be many You Tube videos on the subject also.  Good luck repairing / restoring this Unit.



"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
david.  You must have gotten a 2fer

"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards, 

MrFixr55


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RE: Coronado Radio-Phonograph Model 43-7651 Series A - by MrFixr55 - 02-28-2023, 09:23 PM



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