System 1 MPUs can't use an EPROM unless you use an adapter--you need to use either an original masked ROM or an EPROM with an adapter like this:

http://pinitech.com/products/gottlieb_prom.php

[edit]: Nevermind, I misread the question.

Those boards were poorly made. The irreplaceable chips are contaminated and rot from the inside. I usually buy a pascal board or convert to chimes.

Ps also the adapter only works on cpu proms . The sound board pin outs are different

Oops, I was on the go and misread the question.

The adapter is only for the MPU.

The links for the compatible replacement sound boards (one version is currently out of stock):

http://www.flippp.fr/pifx1.php
http://www.flippp.fr/pifx.php

If the heat sinked item is the 5 volts regulator, chances are, the PROM is internally shorted and loading down the regulator. This would explain both items getting hot.

However, if with the Prom removed, you are getting more than 5 volts DC out of the regulator, then the regulator is likely shorted and damaged other ICs on the board.

John may have the ability to sell you a new sound Prom L

https://www.flippers.com/catalog/product_info.php/gottlieb-game-sound-promeproms-p-2802

But at $25, I would try to make sure it's the only thing wrong with your board now (hard to do without a known good PROM). Not sure if another pinsider could help you on that subject. Once you add up all the shipping back and forth, it hardly sounds worth it. Except the alternative is out of stock.

There is a very good chance the only problem is the Prom that someone probably plugged in backwards. This shorts out a protection diode across Vcc and Ground inside the chip.

Check the second link. It's also compatible, just a bit more expensive since it also includes system 80 games, and not just system 1 games.

You can also consider replacing your board with a TWISTER Sound!
TWSound57 (resized).jpg
Details are available at our website https://www.flipprojets.fr/AudioTwisterSound_EN.php
Soon available at pinside market... but you can contact us now for price/availability.

And unlike other cards, this one faithfully reproduces the original sounds
This board was developed to overcome the deficiencies of obsolete components like MMI PROM, 6530 RRIOT and 6503 CPU.

If only your PROM is dead, it is not necessary to change the entire board (sometimes we find replacement adapters, but rarely original PROMs). On the other hand, if the 6530 circuit is dead, it can not be changed.