, Acoustat power supplies

Dick Lanham2004-05-08 16:56

I am having trouble with both power supplies of my MK 121 - C. First of all I cannot find a MODEL NUMBER on the casing. The only numbers are serial number 01096877 and 010960 (or 8)78. The only words Medallion Transformer. I have someone working on the power supplies but he needs the schematics and parts list. MK 121 - C have 7 models. Is the power supply the same for all models? Where can I look for the MODEL NUMBER if they supplies are not all interchangeable? If my technician cannot repair my power supplies or working modesl (new or used in good repair) available? If so, where? If not, could another company's power supplies work? If so, which companies. Any help you can give me will be most appreciated. Thanks. Dick Lanham

Andy Szabo2004-05-15 09:20

Sorry, Acoustat was never much for identifying its model numbers. Fortunately, the MK-121 Series is electrically the same for many different models (there are differences in physical chassis style). The only change is the low-frequency transformer tap, which is user-adjustable. Schematics and Parts Lists are available from this site. Ask for the Owner’s Manual that applies to the Models One, 1+1, 2+2, and 3. The manual available may have the schematic for the MK-121B, which is slightly different. If so, ask for the MK-121-C schematic, which is available separately. Most repair parts are available, especially now that some new-old-stock audio transformers have appeared on the market. These are frequently available on e-Bay from Sound Valves. If your local technician cannot repair your interfaces (they are a bit unusual, and difficult to test), you might try contacting Roy Esposito at Sounds Like New. See the section under “Refurbishing” for further details.

Dick Lanham2004-07-13 11:06

Please see my answer to my own question in Capacitors, again. Thanks Dick Lanham

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