Specifications

I have suffered a catastrophic loss of an amplifier due to lack of surge suppressors in the
past so, I believe in them, and use them extensively.
I installed a set of 130Vac @ 340 Joule MOV's, pointed out in Fig.5 by the letter "A". There
is one per primary line, grounded at the mount center. The MOV's are connected to line 1 &
2 between primary fuses F-1 & 2 ("F" in Fig.5) and K-11.
Should an AC line voltage surge happen, the MOV's will shunt the current to ground. If the
duration of the surge is long enough, the fuses will open, interrupting the current flow.
Metal Oxide Varsistors are quite good about conducting only when an "over-volt" condition
is present. If enough surge current is shunted to ground by the MOV, it will self-destruct, and
must be replaced for future protection.
AC wiring
I found the AC primary wiring harness of the 86 to be a little cumbersome & inefficient. I
removed all of it, and re-designed it for a more efficient and cleaner layout. It is much easier
to trace out now too. Fig.5 shows the new harness. The original harness was so erratic that
the connections on K-11 & 12 could not even be seen. There were many loose connection
too.
LVPS
Low Voltage Power Supply; I found that an error or perhaps an improper part replacement
had taken place on the LVPS.
Fig.6