oldhvymec - Spot on!
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Look at how they do it on a LOT of the old preamps. Mac takes the right and left outputs uses a 47K resistor into a RCA for a center channel output. That’s a point to point C20 valve schematic.
C20 preamp schematic - tubebooks.orgwww.tubebooks.org ›
I’ve listened to mono but its been 30 years or so.. Center mono without filtering like a SST (analog) Trinaural Processor, kinda suck to tell the truth..
Trinaural processing is pretty cool though.