[Jukebox-list] RE: Wurly 2410s NOT stereo?

[Wesley Dean]

    Kyle, you speak of different 'filter'. Are you referring to the high 
pass caps coupling the tweeters to the signal? If so, you can get more 
effect by operating the tweeter out of phase. Wes
----- Original Message ----- 
From: "Mechanical Music of S.F." <mechanicalmusic at hotmail.com>
To: <jukebox-list at lists.netlojix.com>
Sent: Saturday, September 16, 2006 1:42 PM
Subject: [Jukebox-list] RE: Wurly 2410s NOT stereo?


> Re: The one on eBay....
> Yup, a Cobra mono setup.
> I suspect that Wurlitzer may have been putting these panels on in the 
> factory, perhaps a late run and they were out of the correct part, or, as 
> I've said all along, I'm SURE Wurlitzer was passing off mono jukes as 
> stereo for a couple years. We had one in our shop years ago, a 2600 (1962) 
> and it said it was stereo. NOT so.  It had 3 speakers in it and all were 
> wired in parallel with different caps from a mono amp. I'm sure it had a 
> stereo cartridge, but I think it was bridged to one input plug.
> They would configure 3 or 4 different speakers with different filter caps 
> and ta-da! instant different-sounds-from-different-sides-of-the-cabinet 
> fake "stereo".  In the 1950s, most people didn't know ther difference and 
> there weren't really any stereo 45's until 1968, '69.
>
> This speaker capping was even still true as late as 1967 and 1968 with the 
> Americana 3100 and 3200 series, and possibly later, although at this 
> point, they were all really stereo.  Both my nephew and a friend (3100s) 
> and I (3200) have slightly DIFFERENT woofers in our machines (housings 
> look basicly the same, but one has ribbed cone, other smooth) and ALL 6 of 
> the speakers are filterd with different value caps, quite obvious even on 
> the schematic.  The effect?
> Even mono records have a slight bit of seperation with diffenet sounds 
> filtered to oposite sides of the jukebox.  It's not all that dramatic, but 
> there's a certain depth and if you sit with your eyes closed in front of 
> it, the sound does not seem to emminate from the center; there's a 
> definite binural effect (Early Disney stereo movies, like "Fantasia" were 
> recorded in binural, which was 2 microphones placed in the center of the 
> room but facing opposite directions, rather than being seperated an equal 
> distance from center to side wall. With music, this very closely 
> represents what a listener seated right in front of the orchestra would 
> sound like).
>
> Jackie.  You have a tough decision to make.
> Best bet for practical use is to replace the Cobra cartridge and tonearm 
> with a stereo model and cartridge  bridged to mono, and send your amp to 
> someone for a rebild and mods necessary to eliminate the Cobra circuitry.
> I'm having fantastic luck with my Wurlitzer 3200 using a Sonotone 9TA 
> cartridge, but flipping the needle over to the 78 side (we've all 
> discussed the current state of avavlable needles and the damage they cause 
> to plastic USA 45's). Most of my records are in very good  or better 
> condition, but I do pick up a little bit of MINOR surface noise on a few 
> of them due to the wider 78 needle tracking higher in the groove. 
> However, it doesn't damage them.  Ditto my nephew's 3100.  I have an 
> Astatic 133 in that one playing with the 78 side.
>
>
> Kyle ~
> Mechanical Music of San Francisco
>
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