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Fender amp layout question

8/30/2004 6:13 PM
Fender amp layout question
I've bee looking over a few Fender layouts, and in many of them there are letters (encased in a little square box) at various points in the circuit. What do these correspond to?  
Here's a link to a blackface Vibrolux layout; notice several X's, Y's and Z's.

Cole Davis Points marked "X" connect together,... -- 8/30/2004 6:27 PM