Marantz SM-7 without the AC/DC coupling switch???

rhiohki

Well-Known Member
I was able to get my hands on a SM-7, ST-8, and SC-7 marantz esotec stack. The only reason I was able to get that stack was because I bought another SM-7 previously and was contacted by the seller of the former. I was comparing both amps and one of the SM-7s have the AC/DC coupling switch on the back panel. The other SM-7, however, does not have this switch.

As a caveat, the SM-7 WITH the AC/DC switch is in fair to good cosmetic shape and has DC Offset at:
LEFT: 2.6 mV
RIGHT: 222 mV (crazy high...I dunon why??)

The other one without the switch is in very excellent cosmetic shape and has DC Offset at:
LEFT: 2.4 mV
RIGHT: 27 mV

I don't need two SM-7s, and would most likely sell one. What should I keep and why? Why did Marantz produce some SM-7s without the AC/DC coupling switch and others without it? I'm leaning on keeping the SM-7 WITHOUT the AC/DC coupling switch.

I'll include some pics later tonight if possible. Any insight would be helpful.

Thanks again
 
Serial of AC/DC Coupled Switch SM-7 (095P010011)
Serial of Non AC/DC Coupled Switch SM-7 (07P100061)
If serials help production date or numbers, let me know. Her's a pic:

SM7compareback2.jpg
 
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