Author Topic: 1ST622M - 1962  (Read 337 times)

Motorola Minion

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1ST622M - 1962
« on: May 14, 2019, 09:27:48 AM »
I posted in sightings that this was a unit I saw at Habitat Restore, tried to forget, then went back and loaded myself without any damage done. I then carried it to my upstairs shop after removing the record changer and back cover, to make grabbing the cabinet much easier.

While there were so many models for 1962, this one seems to have all the goodies: 1000 cycle horns, 12" woofers, push-pull 6BQ5 tube amp and a multiplex decoder for FM-stereo. I went against my normal judgment and tried a power-up at the store and FM stereo was clearly heard form both channels before I switched it off.

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Dave

electra225

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Re: 1ST622M - 1962
« Reply #1 on: May 14, 2019, 10:14:21 AM »
The 622 was a five knobber while the 655, 656, and 657 were six knobbers.  The 622 has a six tube tuner, the others have an eight-tube tuner.  The 15" woofers were replaced by 12's in 1962 in some models.  1962 and 1963 are hard years to document when dealing with Magnavox.  Lots of changes, lots of mixing of components and cabinets.  The 93 series chassis is more plentifully used in '62 and '63, which is a good thing.  The 88 series lasted thru the end of tube instruments.  The 15" woofers went by the wayside for the most part, only used on the top-line models.  The topline model for '62 was the stripped version of Concert Grand, not many were made.  I reckon the Symphony was the next in line, since both Imperials died after the 1961 models.

I would not be afraid of powering up a Magnavox for test.  They used Mallory filter caps for the most part and those were pretty good.  I'd do a good recap for long-term reliability, as you well know.  I've only seen one set of salty filter caps in a Magnavox, and that was in the Channel One bass amp in my Concert Grand.  The cathode bias resistors are the ones that concern me in a Magnavox amp.  I have found several of those bad, burned internally.
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Bill

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Re: 1ST622M - 1962
« Reply #2 on: May 14, 2019, 05:35:31 PM »
Dave,

I have a 1ST-657.  It looks just like yours under the hood, and the components inside.  It's on the list for a rebuild.  Hopefully sooner than later.

Bill

danrclem

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Re: 1ST622M - 1962
« Reply #3 on: May 14, 2019, 08:55:46 PM »
Those 6BQ5 tubes look like they could be Mullards.  If they are they're a prize by themselves.  Good find.

Edit;

I just read your post in sightings and I see that they are indeed Mullards.  Very good find.

Motorola Minion

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Re: 1ST622M - 1962
« Reply #4 on: May 15, 2019, 03:38:05 PM »
Here is the tuner and changer in my 1ST659 Normandy Provincial, which the 1962 brochure says should be a series 200. ???

Me confused here but I love both these consoles despite the series 100 radio (5-knobs). That multiplex adapter is a plus on both!

Dan - What is the chassis number on your 6-knobber? I must see what the difference is on a schematic :)

I have a 1960 Symphony 1ST208 with 6-knob tuner and 8 speakers (no horns) but an amp 175 and 15" woofers. It has a permanent place in a bedroom since it matches the Mahogany bedroom furniture. I restored it but it has a few issues yet, but sounds wonderful.

Also have a 1959 1SC202 ( basic phono-only model using an AMP 185) It also has 15" woofers, but I plan to restore then sell this one.
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Dave

electra225

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Re: 1ST622M - 1962
« Reply #5 on: May 15, 2019, 05:14:02 PM »
We are talking about a 1962 Magnavox.  Lots of changes going on.  I'm not sure this will help, but here goes.   :-\

The Imperial series is listed for 1962, models 661, 662, 663.  Those allegedly have the series 200 tuner, heretofore thought to be a six knobber.  The Symphony series, models 656, 657 and 959 also have a series 200 tuner.  The smaller "20" series models 620, 621, 622, 624, 625 and 626 all are listed with the series 100 tuner, heretofore thought to be a five-knobber.  I looked up the 57 series tuner chassis on Downloads and saw a 12AX7 audio tube in the tuner.  My 1961 57 series tuner has a 6EU7 in the tuner.  So, I'll toss this out for discussion.  What if the series 200 tuner is actually a five-knobber for 1962.  My Stereo Theater is a six-knobber, but it is not like my 1961 six-knobber.  The '62 version has a three-position bass control, while the '61 has a variable control.  The '62 version is also a 9-tuber, the extra tube being for the TV sound.  I know of one model 657 that is a five-knobber and allegedly has the series 200 tuner.  Apparently, you have a 200 tuner that is a five-knobber.  I have never seen a '62 Imperial so I can't say if the six knob tuner still existed in 1962.  My '62 six-knobber is a 79 series.  It would be interesting to see if the '62 series 200 tuners still have eight tubes.  The series 100 should be six tube model.
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Bill

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Re: 1ST622M - 1962
« Reply #6 on: May 16, 2019, 06:57:29 AM »
My Symphony is model ST-657A. Run number 3.  It has 12" woofers, horns, 9300 series amp, two tube FM multiplex.  It's a five knobber, with a six tube tuner, making it a series 100 tuner.  I think in 1962 you got what every was handy as the console moved down the assembly line. Nothing makes sense.

Bill

Motorola Minion

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Re: 1ST622M - 1962
« Reply #7 on: May 16, 2019, 08:27:02 AM »
This makes sense regarding the series 100 tuner, which I assume is chassis 7909 or 7910 like both my five-knobber 1962's with 6EU7 preamp tube. The external mpx decoder was the consolation feature added to the five knobbers.

What Greg describes as a six-knobber is a 200 series, not a vertical but a horizontal dial series 57, like my 1960's 5703 pictured.

Now for the differences, is it accurate that the extra tubes in a series 200 are for the tuned RF stages
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Dave

electra225

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Re: 1ST622M - 1962
« Reply #8 on: May 16, 2019, 09:46:03 AM »
The 57 series tuner in my 1961 Symphony is an early model, before they put "FM AFC" in the tuner.  It has a tuned RF stage for FM only.  The AM section is like an AA5--converter, IF and detector stages, along with audio.  The eight tube "series 200" 57 series tuners with six knobs may also have an extra audio stage.  My experience has been that the smaller 6-tube "series 100" tuners are actually better performers than the bigger tuner.  The AFC feature of the smaller tuners eliminates the FM drift so prevelant in the earlier tuners.  1962 is the only year they used the "series 100" and "series 200" nomenclature, as far as I've seen.  My 1962 Stereo Theater, model 418, has a six knob, 77-03-00, 9-tube tuner.  I have a picture of a 417 and a 418 with a five-knob tuner, also 1962 models.  Dave, your 1960 Symphony has the same tuner as the horizontal tuner models, with the dial numbers facing the end of the cabinet. The 1961 dial is the first vertical dial and can be read from the front of the cabinet.  The 1962 version I have of this tuner, that I may have mistakenly identified in an earlier post, as a 79 series, is different from the 1961 version I have.  The bass controls are different.  I believe 1960 is the first year for the vertical mount six-knob tuner.  It may actually be different between 1960, 1961 and 1962 versions.  I have never seen a tube 1963 six-knobber and have not seen or heard references to same.  Edit: six knob 1963 Astro-sonic versions were available. 

I'm glad to see several 1962 models starting to appear in collections.  It is my belief that Magnavox started its fatal downward spiral in or around the 1962 models.  The bean counters were in firm control of production.  They may have changed features of their instruments after the documentation we have was published.  The '62 model Concert Grands were robbed of eight or ten tubes, and the remote control.  The Symphony series with its eight speakers and 15" woofers has horns and 12" woofers, along with a six tube tuner, in 1962.  The TV sets lost their one-piece CRT and hard-wired chassis in favor of two-piece units with PCB chassis.  The big Imperials disappeared.  The little Imperials were still listed, but does anyone have one or have seen one?  I haven't myself.  We are learning more about the 1962 and '63 models lately.   

As to the use of five-knob tuners in place of six-knobbers.  It is theoretically possible that Magnavox discontinued use of the six-knob tuners during 1962 production as supplies ran out.  They used what was on hand, then switched everything to the five-knob, six tube tuners. 

Another point.  I have been wanting for some time to reproduce documentation for Magnavox.  Model number stickers, cabinet wiring charts, operating manuals that kind of thing.  The more I dig into Magnavox, the more I am convinced of the fallacy of that effort.  Magnavox changed things too often.  It almost needs to be done instrument by instrument. 
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Bill

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Re: 1ST622M - 1962
« Reply #9 on: May 17, 2019, 10:48:25 AM »
Greg!  It makes sense with your comment, that as components ran out in 1962, that they would start using what was on the shelf.  My Symphony was run three, and is a 5 knobber, 6 tube tuner, with 12" woofers, and horns for tweeters.  Being run three, I'm sure it was at the end of production for the 1962 year.

Bill


electra225

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Re: 1ST622M - 1962
« Reply #10 on: May 17, 2019, 11:39:04 AM »
My Stereo Theater is run 1.  Maybe we should be paying more attention to the Run numbers on 1962 model instruments.  I appreciate your comments, Bill.   :)
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ukfan4sure!

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Re: 1ST622M - 1962
« Reply #11 on: May 26, 2019, 02:53:59 PM »
I think in 1962 you got what every was handy as the console moved down the assembly line. Nothing makes sense.

Bill

You said it, Bill.  I've had several, I just shake my head at each one.  They all seemed different in one way or another.
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Bill

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Re: 1ST622M - 1962
« Reply #12 on: May 28, 2019, 05:22:45 PM »
Hey UK!

I like your avatar. What's all pictured?

Bill