No audio [ has hiss] on Gunsmoke cocktail

RetrOmatic

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I have my Gunsmoke nearly ready to play, the game works, but no audio. THe speaker does respond wth hiss when the pot on the PCB is moved. So i`m thinking a voltage check. Gunsmoke doesn`t have a -5v on the edge connector, so what else should i be looking for? as i always thought audio was a -5v issue. THe edge connector has audio + & - , but it doesn`t say for how many volts. I have 5v at the power supply, and + 12v at the PCB, not sure what else to look for.

Has anyone some other tips here ? thankyou Paul.


No help so far, hope it`s not too basic for a reply.
 
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