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 Post subject: Sparton 661-RP radio and recording phonograph
PostPosted: Apr Mon 16, 2012 7:58 pm 
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Joined: Jan Thu 19, 2012 9:35 pm
Posts: 307
Location: Lompoc, CA 93436
Hi,

Can't find much besides a schematic at Nostalgia Air. Does anyone know if this is 33 1/3 or 78 RPM?
I'd like to get a blank disc to record on to try it out but need to know what speed it is. Operating instructions would be great! The instructions for a Sparon 1071RPA would probably work as my unit also has the dual tonearms unlike the nostalgia air documents.

Thanks,

Corby


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 Post subject: Re: Sparton 661-RP radio and recording phonograph
PostPosted: Apr Tue 17, 2012 1:22 am 
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Joined: Apr Fri 21, 2006 12:49 am
Posts: 9173
That unit uses a high voltage crystal cartridge, which I can almost positively guarantee is bad. Same with playback cartridge.
Outside of that, there are the paper capacitors, and, electrolytics to worry about first.
This will not be a budget job.
Worth restoring if you want to spend the money.
Bill Cahill

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 Post subject: Re: Sparton 661-RP radio and recording phonograph
PostPosted: Apr Tue 17, 2012 7:28 pm 
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Joined: Jan Thu 19, 2012 9:35 pm
Posts: 307
Location: Lompoc, CA 93436
The playback is an Astatic crystal unit and the cutting head is magnetic. I did figure out its speed as 78RPM as the Astatic cartrige installed is for that speed! Now to see if I can find a blank 78RPM disc to try it on once its finished. :)


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 Post subject: Re: Sparton 661-RP radio and recording phonograph
PostPosted: Apr Wed 18, 2012 8:54 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2313
Location: Boston, MA USA
Some of the early radio/record cutter units used a special blank with the grooves already pre-cut into the blank. That is because they didn't have a lead screw or tracking disk to create the grooves. Don't know if your unit falls into this category -- if so you are probably going to have trouble finding pre-grooved blanks.

-David


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 Post subject: Re: Sparton 661-RP radio and recording phonograph
PostPosted: Apr Mon 23, 2012 1:13 am 
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Joined: Jan Thu 19, 2012 9:35 pm
Posts: 307
Location: Lompoc, CA 93436
Upon inspection the cutting tone arm rides on a lead screw underneath the unit that slowly rotates as the turntable spins. So it looks like it does not require a pre-cut groove! :D

Corby


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