Power Supply Replacement

Here is the link to the supply house that has this item in stock.

http://www.hosfelt.com/Adapter%20Folder/Adapter%208.htm

This data is copied from that page, including price.

Mfg. # WP571420G
3-1/2"x 2-1/4" x 2-1/2"
Input: 120 VAC, 60 Hz
Output: 20 VAC @ 700 mA.
Class 2, plug in transformer. The enclosure is black. Output via two screw terminals.

PART # 56-526

$2.75

By the way, these same folks stock the Atari game transformer to run an ART Di/O.

You need to get the catalog from Hosfelt, this is the type of goods they specialize in. Hope this works out for you.