DCinDC
I'm here to fix it
This 7000 was made in August of 1971. 221080484
Just thought I would pipe up to say that that is the earlier production 7000 with the large tone board.
http://www.audiokarma.org/forums/attachment.php?attachmentid=349245&d=1337053989
Here is the thread showing the two different boards.
http://www.audiokarma.org/forums/showthread.php?t=369638&highlight=7000
With the large board, the mic jack may or may not be a shorting jack to reduce noise.
