Rockola Princess 1493

Q&A about all types of jukeboxes: Wurlitzer, Seeburg, Rock-Ola, AMI, and more.



Topic author
clones
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Rockola Princess 1493

by clones » Mon Oct 28, 2013 1:34 am

Hi
Could anyone tell me the impedance of the high frequency horn used in the 1493, don't see it mentioned in the manual
regards
Clones


Ron Rich
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Re: Rockola Princess 1493

by Ron Rich » Mon Oct 28, 2013 1:51 am

Did you look at the amp schematic ?--That's often where stuff like this is noted.
Ron Rich


Topic author
clones
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Re: Rockola Princess 1493

by clones » Mon Oct 28, 2013 2:42 am

Ron
yes I looked at the schematic, but it only indicates the low frequency speaker as 8 ohms and just refers to the other as the horn-high frequency speaker and doesn't state the ohms
regards
clones


Rob-NYC
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Re: Rockola Princess 1493

by Rob-NYC » Mon Oct 28, 2013 7:43 am

Rock-Ola typically used 16 ohm tweeters in an 8 ohm setting to give a cheap form of padding of the highs.
The originals were Atlas (IIRC) and very recessive although washing them did often help bring a little brightness. This was pretty much the same horn that AMI and R-O used on multiple models. When speakers are scavengered it is usually only the 12" that are taken, so there should be a lot of them around.

If the original is missing I suggest going with a modern horn such as this: http://www.pyleaudio.com/sku/PH44/4-x-4-Horn-Tweeter. Since it is smaller in width you can add a filler plate, or use two in series.

The real improvement in sound requires replacing the crappy ceramic cart with a magnetic and preamp then removing the crude torsion spring used to "counterweight" the tonearm and adding a real counterweight. This will not only sound -much- better but be a lot easier on your records.

I had one of those little machines and while I left the original tweeter in-place I added a new square horn along with the arm mods and a 6 db crossover to get the highs out of the woofer. This effort took it from sounding like a cheap compact juke to a nice little machine which was genuinely pleasant to listen to.

Rob/NYC
"If we believe absurdities, we shall commit atrocities" -- Voltaire


Topic author
clones
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Posts: 582
Joined: Thu Aug 11, 2011 11:29 am
Location: County Louth, Ireland

Re: Rockola Princess 1493

by clones » Mon Oct 28, 2013 12:14 pm

Thats great,thanks for the information,
regards
Clones

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