Author Topic: Difference between a 2-ST656A and 4-ST656A?  (Read 440 times)

Burnsy949

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Re: Difference between a 2-ST656A and 4-ST656A?
« Reply #15 on: October 05, 2019, 04:06:59 PM »
OK, here are the pics!

1947 Magnavox 148B - CR-197D chassis, 1961 1ST611 Concerto Far Eastern Contemporary.

Burnsy949

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Re: Difference between a 2-ST656A and 4-ST656A?
« Reply #16 on: October 05, 2019, 04:22:10 PM »
More pictures...
1947 Magnavox 148B - CR-197D chassis, 1961 1ST611 Concerto Far Eastern Contemporary.

Burnsy949

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Re: Difference between a 2-ST656A and 4-ST656A?
« Reply #17 on: October 05, 2019, 04:23:55 PM »
It is a 93 series!  Looks like original EL84s in there...  I have no idea what NIGHT means... Built by the night shift perhaps?
1947 Magnavox 148B - CR-197D chassis, 1961 1ST611 Concerto Far Eastern Contemporary.

Burnsy949

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Re: Difference between a 2-ST656A and 4-ST656A?
« Reply #18 on: October 05, 2019, 04:25:56 PM »
Included the multiplexer and 79 series Tuner!
1947 Magnavox 148B - CR-197D chassis, 1961 1ST611 Concerto Far Eastern Contemporary.

Burnsy949

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Re: Difference between a 2-ST656A and 4-ST656A?
« Reply #19 on: October 05, 2019, 04:45:22 PM »
So 9304-20 Amp.  7909-10 Tuner.  7002-00 Multiplexer.   RP-108 (made by Jensen) Horn tweeters.   These looks like 12" woofers based on the Magnavox speaker code 581206-1.  Speaker cone says 426-24.  Could these by CTS speakers?

I'm wondering if I can use this 7002-00 multiplexer with my 59 series tuner and 88 series amp in my 1-ST611?  The connections seem to be the same as my 59 series, so that would be awesome if so. 
« Last Edit: October 05, 2019, 05:16:03 PM by Burnsy949 »
1947 Magnavox 148B - CR-197D chassis, 1961 1ST611 Concerto Far Eastern Contemporary.

electra225

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Re: Difference between a 2-ST656A and 4-ST656A?
« Reply #20 on: October 05, 2019, 05:20:40 PM »
If the Molex connectors fit, the MPX should work in any Magnavox instrument with stereo FM capability.


Your 12" cone speakers are coded "137" for Chicago Telephone Supply with a "239" date code, the 23rd week of 1962.  The horn speakers are coded "220" for Jensen and are date coded "231" for the 31st week of 1962.  The tuner is dated "242" which is the 42nd week of 1962.  All over the place, which was what I found with my Stereo Theater.  Everything is nice and clean.  That basically has the same guts in it as my Stereo Theater.  It should be a robust performer, I don't believe you'll be disappointed. 
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Burnsy949

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Re: Difference between a 2-ST656A and 4-ST656A?
« Reply #21 on: October 05, 2019, 05:42:25 PM »
Awesome - thanks Greg!   

I'm almost ashamed to admit that I paid a whopping $20 for this console...   My friend was kind enough to break it down for me today and it's being packed for shipping at FedEx in Utah as we speak.  I paid him another $40 for gas and for the time to go get it.  I think he had fun doing the disassembly so it was win-win!  So far I'm into it for $60. plus whatever shipping ends up costing.  It should be here in a couple of days.   

I'm super excited about getting the changer too - it is much cleaner than the one in my 1-ST611 Concerto Far Eastern Contemporary that I'm currently restoring.  The 1ST611 had a changer model 523222.5 and this one is model 523222-13.  Both made in England, and both made by Collaro I believe.   The cam gear spindle had seized in my other one, and this had caused the lower cam gear spindle threads (and nut) to stripped (and who knows what other damage done...).  I managed to free that spindle up and relube it.  Hopefully the stripped threads on the cam gear spindle won't be an issue, but I have a backup plan if so.    I may just rebuild this later one and put it in the 1ST611 because it's so much cleaner overall.  Heck, this newer one had the 45 RPM adapter (which my other one was missing) and those are about $20 each by themselves, so I think that worked out... 

Of course the multiplexer is a huge bonus, and even if I don't use the tuner, I can use the knobs, as they are the same as my 59 series tuner, and cleaner than the others.  The dial cord is broken on this 79 series, but that should be relatively easy to fix. 

I'm curious if the 79 series tuner is significantly "better" than the 59 series?   The controls all appear in the same place, but they are flipped 180 degrees based on the orientation of the tuner in the cabinet.   I'll have to look and see if I can just use this 79 series chassis in the 1-ST611...  The tuner dial may be upside down if I do.    Here are the two tuner faces.
1947 Magnavox 148B - CR-197D chassis, 1961 1ST611 Concerto Far Eastern Contemporary.

Bill

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Re: Difference between a 2-ST656A and 4-ST656A?
« Reply #22 on: October 05, 2019, 07:22:49 PM »
Very interesting!   You have what I have in my 657 Symphony.  They are pretty much twins under the hood, the only difference I can see is the cabinet.  Are you getting the cabinet, or just what's under the hood?  Either way, you will enjoy the sound that combination of components produces.  Good luck, and have fun.

Bill


Burnsy949

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Re: Difference between a 2-ST656A and 4-ST656A?
« Reply #23 on: October 06, 2019, 12:49:45 AM »
Very interesting!   You have what I have in my 657 Symphony.  They are pretty much twins under the hood, the only difference I can see is the cabinet.  Are you getting the cabinet, or just what's under the hood?  Either way, you will enjoy the sound that combination of components produces.  Good luck, and have fun.

Bill

Bill, I decided not to keep the cabinet.  It would have been too expensive to ship to California from Utah, and I wasn't a fan of the styling, so unfortunately it's probably going to be discarded.   I did get EVERYTHING out of the cabinet first, however, including the front panels for the speakers, in the event I want to install the horns in another console.   I'll replace the speaker cloth, since the original panels look like they were used by the cat as a scratching posts for years...  Anyway, with packing and shipping I'm up over $200 now, so not as much as a bargain, but way cheaper than buying all these components separately...

I'm probably going to use the multiplexer in my 1ST611 Concerto.   It's just the right size for my office.   Tempted to put the 9304-20 in there too...  Then maybe I'd need to use the speakers from the 4ST656 too.   I think the impedance is different on the 9304-20 (8 ohms), but haven't confirmed this.

So I assume your Symphony 657 has the 79 series tuner and 9403-20 amplifier?

Does anyone know what the NIGHT designation on the 9403-20 amplifier chassis means?

1947 Magnavox 148B - CR-197D chassis, 1961 1ST611 Concerto Far Eastern Contemporary.

Bill

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Re: Difference between a 2-ST656A and 4-ST656A?
« Reply #24 on: October 06, 2019, 05:59:30 AM »
I never noticed, so I looked, and mine says NIGHT as well.  Mine is a 9303-10.  Now, I wonder what changes were made between the 10 and the 20 you have.  I have a 5 knobber just like you, and mine does have the 7900 series tuner.  Also horns, and 12" woofer with the same square magnets.  MPX adaptor is mounted in the same place yours is, but I understand it's really supposed to be mounted under the tuner.  Factory installation is under the tuner, dealer installed next to the amp. 

Maybe someone on the forum will know what the NIGHT means and can share that info.  Or, maybe it will just be another Magnavox secret.   :) :)

Bill

electra225

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Re: Difference between a 2-ST656A and 4-ST656A?
« Reply #25 on: October 06, 2019, 08:39:12 AM »
Both of the changers should be identical Collaro S-600 models.  The difference will be trim.  The Symphony changer will say "Imperial Micromatic".  Too bad about the cabinet.


The 93 series amp may not work in your 611.  The wiring may be different.  No two that I have are identically wired.  I have no idea about the "NIGHT" designation.  I'm GUESSING that is the shift it was built/assembled/shipped.  The biggest difference between the 88 series and the 93 series is the balance control.  On the 88 series, the balance control is in the hollow shaft of the bass control.  Many 93 series chassis have the balance control on the amp chassis. 
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