(Topic ID: 267687)

Williams speech board, extremely low volume

By MeEtc

3 years ago



Topic Stats

  • 6 posts
  • 4 Pinsiders participating
  • Latest reply 3 years ago by MeEtc
  • No one calls this topic a favorite

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#1 3 years ago

I have a Williams Comet that has an extremely low speech volume. Electronic sounds are fine. I have to max both the cabinet volume pot and speech balance pot on the speech board, and I can then get a whisper of the speech board sounds. The sounds themselves seem to play correct. The board is the 8228 version, with a 55564 IC instead of a 55516

#2 3 years ago

Maybe the OP-amp for the speech is blown/dead/dying?

#3 3 years ago

Possibly. I can only find SMD versions available here though. Rather not have to order from USA.

#4 3 years ago

most likely bad op amp. i have replaced the 1458 a bunch of times to fix low volume. There are other similar op amps you can use. I remember in a pinch years back finding something at radio shack with a different part number (TL082) but similar pin out that worked fine in FirePower.

#5 3 years ago

Yes, most dual opamps such as TL072, TL082 or LM1558 have same pinout and will all work.

#6 3 years ago

Replaced U3 with another 1458 i found in a parts drawer. Works with just the single opamp swapped.

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