To ground or not to ground the OPT secondary, that is the question - Page 3 - diyAudio
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Old 7th May 2011, 04:04 AM   #21
cerrem is offline cerrem  United States
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Join Date: Jun 2005
Location: San Diego, CA
Quote:
Originally Posted by Rodeodave View Post
The McIntosh MC75's OT has the following secondary connections: COM-4-8-16 and a separate winding for the feedback which has one end of the winding internally grounded. There is the option to install/remove a link to ground/float the secondary. Using the link the COM-tap is grounded.
Now iff it works, grounding the 4Ohm tap and using the com/8Ohm would seem like a nice idea. But does it really work that way? Do you get a balanced signal between com and 8Ohm them? What about the 16Ohm tap? Will it really be symmetric to 4OHM=GND? What happens to the primary impedance, does it see what's going on on the secondary in this case?
Keep in mind that the MC outputs are really wound COM-4-9-16...even though they are labeled for 8 ohms...

Chris
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