After taking advice from pinballjim and some others re: my sound problem, I wanted to provide an update: I actually started a game and wiggled the wires, and sadly nothing else happened.. BUT, I wanted to mention that when I disconnect the left cable completely, I can hear power cutting off from one of the speakers, and coming back on when it's reconnected. And when I pull the right connector, I hear no current/power running at all anymore- total silence. So, I'm hoping this helps to elude any concerns regarding broken solder or poor connections. I'm still not hearing any sounds when hitting the "test" switch either, which is to the left of the left connector. Is this maybe starting to elude to the possibility of blown speakers?
I also forwarded the above details to the guy who has sold me the replacement speech card, and he provided the following update:
"The hum you hear is normal & it means the amplifier is working properly. The majority of sounds are made on the main cpu & the speech is made on the smaller board. The sound level between the sound & speech is controlled by a control on the speech board. If the speech board does not correct your problem then the problem would be on your main cpu. We can test & repair your cpu if required & take your old speech board as partial credit towards repairs. The Sorcerer sys 9 cpu boards are hard to find undamaged so repairs are your best option. Hope this info helps. Let us know when you receive your speech board & how you make out."
Please watch this thread for any other updates from me.
Thanks,
VINTAGEGAMER