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Acoustat Model 1 MK-141 upgrade
Acoustat Model 1 MK-141 upgrade
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Old 21st April 2020, 03:10 AM   #1
artm is offline artm  United States
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Default Acoustat Model 1 MK-141 upgrade

I recently purchased a pair of Model Ones, seem to work beautifully but am wondering if upgrades are in order.

Below are some pics of one interface. Looks original to me. Is it?

Also below is a pic of the pc board, albeit a newer version I believe. Is this readily swappable into my setup?

I do have a schematic of the MK-141 but does anyone know of a parts list for modern parts?


Of course, any suggestions appreciated.

Thanks.
Attached Images
File Type: jpg interface-right-1.jpg (233.3 KB, 56 views)
File Type: jpg interface-right-3.jpg (255.3 KB, 57 views)
File Type: jpg interface-right-4.jpg (168.4 KB, 53 views)
File Type: jpg interface-right-5.jpg (277.8 KB, 52 views)
File Type: jpg pc-board-new.jpg (518.5 KB, 52 views)
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Old 22nd April 2020, 11:00 AM   #2
AcoustatAnswerMan is offline AcoustatAnswerMan  United States
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There's no value in replacing the printed circuit board - the newer version pictured is simply revised artwork, not an improvement. You already have the Medallion Transformer - a big step up over previous versions. You could do the C-Mod, which will offer some improvement. You might try cleaning the green oxidation off the variable resistor to improve electrical contact. Otherwise, if it ain't broke, don't fix it.
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Old 22nd April 2020, 11:08 AM   #3
AcoustatAnswerMan is offline AcoustatAnswerMan  United States
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C-Mod Instructions attached. These instructions were written for the MK-121, but are easily adaptable to the MK-141. You could replace the 47-uF electrolytic used in the C-Mod with a better quality film capacitor.
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File Type: pdf Acoustat C-Mod rev 2018.pdf (622.9 KB, 10 views)
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Old 22nd April 2020, 02:07 PM   #4
artm is offline artm  United States
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Thanks for the quick reply.

1. Are you sure these are Medallions? There is no sticker on the outside.

2. I assumed replacing the pcb parts with current ones may be worthwhile. I see either corrosion or flux residue on the pcb. I should leave it alone?

3. Yes, I have examined the C-Mod and am seeking substitute parts to perhaps do this down the road.
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Old 22nd April 2020, 09:51 PM   #5
AcoustatAnswerMan is offline AcoustatAnswerMan  United States
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The black wrapper on the audio transformer tells me it's a Medallion transformer. Plus I recognize the initials on the inspection label as being from the period when Acoustat was building with Medallion transformers.


You can clean any flux residue or corrosion from the board, if you like, or leave it alone.
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Old 23rd April 2020, 02:59 AM   #6
artm is offline artm  United States
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Thanks again very much for confirmation on the Medallions; that was a pleasant surprise!

Finally, what can you recommend for cleaning the flux/corrosion on the pcb and the green oxidation on the resistor?
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Old 23rd April 2020, 11:00 AM   #7
AcoustatAnswerMan is offline AcoustatAnswerMan  United States
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The green (copper) oxide can be removed from the resistor and it's sliding contact with fine emery cloth or similar abrasive.

For flux residue, there are commercial preparations for that purpose. Chemtronics is one brand, and there are probably others. Some scrubbing will likely be required, so use an old toothbrush or similar.
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