meprateek Posted May 1, 2007 Share Posted May 1, 2007 I am trying to restore McIntosh C-11 and C-22 preamps. I have got the schematics for the job but they do not mention the voltage and power ratings of the power transformers. I humbly request the exixting owners of these awesome vintage preamps to please help me out. Please provide me with the details of power transformers on these two preamps. I hope you guys can make them sing again.[] Thanking you all. Quote Link to comment Share on other sites More sharing options...
NOSValves Posted May 1, 2007 Share Posted May 1, 2007 If I had one here to measure I'd help you out preamps rarely have defective power transformers so I have never measured one. Did you contact McIntosh they may help you out on this. You may try contacting Audio Classics http://audioclassics.com/. Also try contacting Terry Dewick http://www.mcintoshaudio.com/dewick_repairs.htm good luck. Quote Link to comment Share on other sites More sharing options...
Guest " " Posted May 1, 2007 Share Posted May 1, 2007 Here is the c-22 service manual in the event you don't have it. It contains part numbers not normally listed in schematic's. C22.pdf Quote Link to comment Share on other sites More sharing options...
meprateek Posted May 3, 2007 Author Share Posted May 3, 2007 Thanks NOSValves and Speakerfritz, [Y] I have got the part number (159-019) for powertransformer from the service manual. But I am not sure how to obtain the tech specs of the transformer. The service manual contains the specs for caps and resistors' but no information regarding ratings of power transformer. Do you guys have any documents which contain the part numbers and the corresponding specification? Regards, Prateek Quote Link to comment Share on other sites More sharing options...
NOSValves Posted May 3, 2007 Share Posted May 3, 2007 No we don't so contact the people I suggested above I'm sure you can get them from one of those sources. Quote Link to comment Share on other sites More sharing options...
electroxav Posted June 29, 2022 Share Posted June 29, 2022 Hello to all here is attached the study for the c11 and c22 Mcintosh transformer calculation (in french) I hope this will help because it is very difficult to find information. XG_TechAudio_Analyse-alim-preamp-Mcintosh-C22_25-06-2022.pdf Quote Link to comment Share on other sites More sharing options...
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