Part 7: First mod

One of the most notable features of this amp is how loud it is. When cranked "up to 11" it is seriously loud. One of the recommendations on the Ampmaker site is changing the wiring on the mains transformer so that the output to the rectifier diodes is less. It is explained here:

Voltage adjust mod

By using the 190 and 275 voltage lugs, the rectifier circuit provides 100v DC and an effective power of 2 watts. Those 2 watts are still seriously loud. Loud enough to drive the 4 x 12 cabinet adequately.

Here's what the modified wiring looks like:

As you can see, only the 275 and 190 lugs are used.

One of the mods that Barry (Ampmaker) suggests is the use of a rotary switch between the transformer and the diodes in order to make the voltage / power selectable. I have got the switch, but havent got round to installing it yet. That'll be in a later post!