Author Topic: HH Sound Board Amp mod/help..???  (Read 725 times)

0 Members and 5 Guests are viewing this topic.

Offline The pinballist formally known as Dean Morgan

  • Trade Count: (+3)
  • ******
  • Forum Posts:
  • Berwick Vic
Re: HH Sound Board Amp mod/help..???
« on: August 08, 2009, 06:25:43 PM »
I should be able to do the Mod...will grab the parts later today...

I just dont understand this part of the mod..???

Now that the pins are soldered to the board, you have to get +12V to pin 14 of the socket. I grab this +12V from the + side of C39. This will bias the +IN so that it won't saturate. Your amp will only work for about 30 seconds without this +12V.

Im guessing I need to find the + side of c39 and run a wire from it to pin 14..??Is that correct??
  Correct +ve side of C39 to pin 14.  Remeber the oriontation of the original chip is upside down.
Im a Gottlieb Man - System 1 & 80 Rock