Rebuilding a 1989 Mozart -- Sharing My Progress

Graham Langley founded Amek in 1973 with Nick Franks. Since then, AMEK and TAC recording consoles have been the choice of demanding audio professionals for over 25 years.

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Re: Rebuilding a 1989 Mozart -- Sharing My Progress

Postby roadbear » Fri Oct 24, 2014 4:13 am

You can see in some of the later photos, that the meter backlights are now working. I removed the old 12v Festoon Style Bulbs. They were all blown anyway, and they are always blowing out and getting hot. I replaced them with these "Chinese Bulbs".


http://www.ebay.com/itm/190747857580?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT


Image

They require 12v, and were running too hot on +17v as originally wires. I switched the wiring around to use +17v for the positive and the +5 as the ground for the lights, which gives a nice clean 12v to lights. The color looks very warm like the original lights do, and they do NOT get hot. I would recommend this to any console owner with old "dome light" bulbs in thier console backlights.
I used 7 total. One for each of the analog meters, and 4 behind the "Mozart" logo. I also swapped the "paper background" that was diffusing the light behind the logo. The original paper was sort of "paper bag" colored. I changed it to 2 sheets of copy paper, clean white, and the logo looks really nice now.


Image
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Re: Rebuilding a 1989 Mozart -- Sharing My Progress

Postby horizonsound » Fri Oct 31, 2014 8:10 pm

The cosmetic results speak for them self. Amazing job.
My Angela was in a similar condition. It took months of cleaning 20+ years of tobacco out of the console, removing and hand-washing every knob, switch cap, fader, face plate, wood panels, support frame etc...
I feel the pain and reward of the amount of time your have spent restoring it.
Well done.
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Re: Rebuilding a 1989 Mozart -- Sharing My Progress

Postby AnalogStudio7 » Sun Nov 02, 2014 1:58 pm

Wow! Excellent work on that Mozart console!

Great attention to details!

One question...

You wrote.... "Also, i could hear 60 cycle hum on the stereo outputs on the console. the hum would decrease in level, as I pulled out modules in the console. Once I pulled out enough modules (more than half of them), the voltage started to stabilize, and the hum almost went away. DC Caps replaced. Problem solved. I had to wait around for the Caps to arrive. They had to be the exact caps, because they had to fit exactly in the space. Expensive, but required."

Where did you find those capacitors??? I have been trying to find them!

Thanks!

Greg
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Re: Rebuilding a 1989 Mozart -- Sharing My Progress

Postby roadbear » Mon Nov 03, 2014 3:25 am

Hi Greg,

I guess I should say that I DID find the exact caps on ebay, but listed as "used" and also from the Phillipines, and at $95 plus $40 to ship (REDICULOUS!)... I DID NOT get these, and decided to test some alternatives..

http://www.ebay.com/itm/Nippon-Chemi-Con-36DE1015-9345L3-Capacitor-23000UF-35VDC-/171512118069?pt=LH_DefaultDomain_0&hash=item27eeeb3b35


Mouser probably can get the exact caps, but they are a non-stocked item with 8+ weeks lead time, No thanks.


To fit in the space....
2" Diameter (must be exact) (Terminal Spacing is standard on 2" Caps I am pretty sure)
3" Height -- can be no more than 3" in order to get the bottom cover with a 1/4" clearance to prevent the chance of damaging the PS motherboard if it is pushed on by a hard bump.


These are caps currently listed on ebay that will probably work fine for this power supply.

http://www.ebay.com/itm/200765390359?_trksid=p2060778.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
$48 for 2 caps...

I ordered 6 of these:
http://www.ebay.com/itm/3pcs-Tech-Cap-40v-27000uf-computer-grade-bus-capacitors-new-/191369993084?
$26.50 for 3 caps...

They are on the edge of too tall, but I made them work, by sanding a little of the threaded metal mount down, to make them fit more flush to the PC board. Also, just to play it safe, I also bent the heat vent openings on the bottom cover that could have potentially hit these "tall" caps in the event of a hard hit. I don't like "rigging" things, but so far, they work great, and they were also a good price.

My choice was based on cost per cap. (Try the cheaper ones first) If I had to do it again, I would have gone with the other ones( more money/cap, little less uf ) but, I know they will fit with no "Modifications".

Also note that the MPS15 power supply is really overkill amperage for the 40 channel Mozart loaded with Non-RN modules. I would guess that the entire console draws 8 amps on the +-17v rails. The power supply could probably deliver 14-15 amps. So, going with a 22000uf cap instead of 23000uf caps wont be a problem.

There may be a better source for the exact caps, and if someone knows, please post!
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Re: Rebuilding a 1989 Mozart -- Sharing My Progress

Postby roadbear » Mon Nov 03, 2014 3:28 am

Hi HorizonSound.....

I am sure your Angela was worth it! Did you take photos of the before and after?
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Re: Rebuilding a 1989 Mozart -- Sharing My Progress

Postby horizonsound » Mon Nov 03, 2014 4:00 pm

Here's some photos of the Angela. If you look closely at the 3rd one, i've cleaned up to channel 13.
The previous owner had it stored in his garage for 8 years. Nearly all pots were seized. The stand had been left out in the weather all this time and had completely rusted.
Angela 10.jpg

Angela 11.jpg

Angela12.jpg

Angela13.jpg
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Re: Rebuilding a 1989 Mozart -- Sharing My Progress

Postby roadbear » Mon Nov 03, 2014 4:44 pm

horizonsound wrote:Here's some photos of the Angela. If you look closely at the 3rd one, i've cleaned up to channel 13.
The previous owner had it stored in his garage for 8 years. Nearly all pots were seized. The stand had been left out in the weather all this time and had completely rusted.
Angela 10.jpg

Angela 11.jpg

Angela12.jpg

Angela13.jpg



Hi Horizon Sound,

Unfortunately,.... can't see the photos. There is an error on load. Probably, this BBS Server needs an update. I had to post my photos on a 3rd party web server, and then call then as IMG tags.

: ),

Rob Tew
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Re: Rebuilding a 1989 Mozart -- Sharing My Progress

Postby roadbear » Mon Nov 03, 2014 10:18 pm

Greg,

These will likely work too, and they are close to the original caps.

http://www.ebay.com/itm/231364830147?_t ... EBIDX%3AIT

Rob
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Re: Rebuilding a 1989 Mozart -- Sharing My Progress

Postby AnalogStudio7 » Wed Nov 05, 2014 6:13 pm

Thanks so much for the caps info Rob!

Keep the pics coming as you do more work to you Mozart! Love it!

Cheers!

Greg
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Re: Rebuilding a 1989 Mozart -- Sharing My Progress

Postby horizonsound » Wed Nov 12, 2014 4:13 am

I'll try those pictures again

Image

Image

Image

Image

Look carefully at image no. 3, where I have cleaned up to channel 13. you can see the difference in tobacco stains.
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