From my post on Transformer Interchangeability topic:
I was confused by the product being offered. I understand about the higher voltage necessity, and how using LEDs will negate having to use the -131 transformer. I didn't hear anything about the connectors in the forums, or how using a beefed-up TR board will also remedy the lack of power.
From the product details on K's Arcade "Powerhouse Transformer":
"Can be used with all Bally solid state games including KISS, Future Spa and Space Invaders*. It is recommended to replace the female housings and crimp connectors on the harness at J1, J2 and J3. Crimp contacts and housings are sold separately. *J1 Connector header pin 9 is used for KISS, Future Spa and Space Invaders. All other Bally and Stern games do not use pin 9. Make sure the J1 connector housing has the key plug installed at pin 4."
According to what I read in the ad, the rectifier board is supplying the higher voltage, necessary to use with KISS, Future Spa, and Space Invaders. This is what I was trying to ascertain.
Thanks to all for your input!