Author Topic: Magnavox 1-ST-621 Danish Classic  (Read 121 times)

Offline 19and41

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Magnavox 1-ST-621 Danish Classic
« on: November 29, 2017, 03:31:17 PM »
I landed my next Magnavox console, a newer 1963 unit.  One of the last tube architecture models and a stereo console.  It has 6 speakers, including 2 12 inchers.  I am starting to sift the components out of the dirt inside.
"Any sufficiently advanced technology is indistinguishable from magic."
— Arthur C. Clarke

Offline RotarDad

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Re: Magnavox 1-ST-621 Danish Classic
« Reply #1 on: November 29, 2017, 11:27:46 PM »
Sounds very cool!  We’d love to see a pic or two.....
Paul

Offline 19and41

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Re: Magnavox 1-ST-621 Danish Classic
« Reply #2 on: November 30, 2017, 12:06:28 AM »
It'll be a few days, I have it in the garage and can't get a proper picture just yet.
"Any sufficiently advanced technology is indistinguishable from magic."
— Arthur C. Clarke

Offline 19and41

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Re: Magnavox 1-ST-621 Danish Classic
« Reply #3 on: December 18, 2017, 04:32:51 PM »
I have come to the last chassis in the console to perform a replacement of the capacitors in.  Two of the capacitors have ruptured and of all places, in the stereo demodulator.  This is what can happen when one must play a 54 year old tube architecture console.  It must've went from a bothersome hum to a loud 60Hz buzz.  They were in exactly the values I don't have, and owing to the nature of the circuit, I want a replacement of the same value.  This will be the 3rd set of capacitors I've had to get for it. 
"Any sufficiently advanced technology is indistinguishable from magic."
— Arthur C. Clarke

Offline LarryInMichigan

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Re: Magnavox 1-ST-621 Danish Classic
« Reply #4 on: December 18, 2017, 05:48:28 PM »
Are these electrolytic capacitors?  Are they rated for a high enough voltage for the application?  Were they connected with the correct polarity?

Larry

Offline 19and41

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Re: Magnavox 1-ST-621 Danish Classic
« Reply #5 on: December 18, 2017, 06:01:52 PM »
These were OEM capacitors.  One was an electrolytic, the other was what appeared to be a paper wound.  Each were correct according to the parts list.  It was just what sometimes happens when the unit is operated with aged capacitors.  Before I could advise them not to, they turned it on to show me the horrible noise it made.  That was probably those failed components doing their thing.  Soon as I get the last two replaced, it will have current, safer capacitors and the quiet parts will be quiet and the music will be loud.
"Any sufficiently advanced technology is indistinguishable from magic."
— Arthur C. Clarke

Offline 19and41

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Re: Magnavox 1-ST-621 Danish Classic
« Reply #6 on: January 09, 2018, 06:03:47 PM »
I know it's been a while, The weather hasn't been cooperating, either.  I've been able to do some more cleaning and finishing on the cabinet and I have each component recapped.  I will now have to install and reconnect the components and when I disassembled the unit I took detailed close ops of everything as it was.  Now, in going to review the pics, I find the SD card has failed.  So I am awaiting the assistance of a very knowledgeable person to help me with integrating the added FM demultiplexer assembly into the system.  The unit also had some bad staining on the top sliding covers, and I have been working on those  to get them at least looking like they haven't been saturated in adult beverages.  At least none infiltrated the unit in any critical areas.
"Any sufficiently advanced technology is indistinguishable from magic."
— Arthur C. Clarke