Speaker Install, OT Removal

My speaker came in, so I installed that into the cabinet. That was the easiest mod ever.

New 12' speaker

8 ohm.

Made on 1.34.2005?

Screwed into the grill.

I also took out the original OT, which was a pain. You have to hold a bolt on the bottom of the chassis with a wrench, and then turn the screw on the top. These were torqued super tight. 

You have to hold this to unscrew the OT.

Screws out of the OT.

Place a cable from ground (amp casing) to all components
to ground them before you touch the board.

Cut these to remove the OT wires. 

4, 8, and 16 ohm outputs.

New OT (top) vs old OT (bottom).

The Hammond 125-ESE is a 15-watt peak, vs the stock 5-watt peak.

I also wrote up a wiring diagram for installing the Hammond 125-ESE, since the wire colors are different on the original OT and the Hammond OT.

Output Transformer schematic, new on left, old on right.
There is no 32 ohm output on the amp, so I will not be using
the white wire.

Labels of where the new wires go.

I also crimped on some connectors to the blue and brown wires of the Hammond OT, which clip on to the amp's main circuit board. I used the same connectors from the stock OT since I could not find any more connectors that were the right size in the SPaRC Lab. I then soldered these connectors, but I made sure to put the connector cover on first! I didn't do that originally, then realized that the connector cover would not fit with the connector already attached to the wire.

I soldered these old connectors onto the wires going to the main board.

Don't forget to put the connector covers on before soldering!