PT Wiring Help

KMC · Post by **KMC** » Sat Sep 03, 2005 10:33 pm

Just got my 50W MV board today

I'm putting it in a Laney pro tube 50 PreAOR. The color codes are different from the Instuctions (i.e. Marshall Drake trannies) I've been told Laney Used Skot trannies? One layout showed 1 white PT wire going to the front of the board. Another showed 2
non-descriped wires going to the side of the board. Just wanna be sure I'm
getting it right here. NO ROOM TO ASSUME

Any help would be appreciated.

Here are some pics if that will help?The 2 orange wires are in ? The 2 purple come off the standby switch. The OT wiring is in? to.
BTW, still no luck finding a schematic. close's I've found was a AOR 100W
and it did not give the transformer color codes.

KMC · Post by **KMC** » Sun Sep 04, 2005 4:08 pm

Is it possable? That the 2nd orange wire (on the left) from the PT is just a Bias tap? and is not needed.

KMC · Post by **KMC** » Sat Sep 10, 2005 10:29 pm

O.K . I think I'm ready ? I've got a plan of attack. But I need you fella's with a better understanding of signal flow have a look. I've studied the Laney PCB and came up with this scenario. My 1st question will it fly or fry? I need to know for sure the Blue wire from cap 2 is my B+? Is the Choke polarized? Here's a few pics that should help