Home > Studio Recording DIY Projects> McCurdy Amp Board

I got this board including edge connectors for $10 from a Radio Ham Operator guy.

I contacted McCurdy to get additional information about these boards.

Their Reply:
The unit you have is in the family of units based on the AM478T Monitor Amplifier. These units were identical except some of the components would vary in value between the different variations. Without having the unit in hand, I am unable to determine the exact model. However, I can provide you with a copy of the manual for the AM478T. This will give you a schematic, and the pinout information you requested. If the unit is not the AM478T, there would be some components with slightly different values on your board as compared to the schematic.

Manual Qty 1 MNL-AM478T - Manual for AM478T Monitor Amplifier - $25.00

McCurdy Radio Industries Limited
1-800-267-8800 or 416-248-6155
Fax 416-248-6755

I thought these were line amp boards and I was hoping to reuse this board as a preamp... so this project is on hold indefinitely.

Looking at the board, you'll see it's 2 channels.  There are 2 power transistors for each channel, which I suspect is the output driver, which then goes to a Hammond output transformer. I think these units are powered from split power supplies.