correct voltages, no sound

[malcolm]

Hi all,

Just finished two J99s. They powered up fine in testing and I set all the voltages correctly, I didn't add the servo yet because I wanted to minimize my sources of error before i was sure the thing produced sound. Then when i went to test it out with a mic, no sound whatsoever, and not to say that there was noise, just nothing no matter where the gain knobs were.

Any ideas what could be the problem?

thanks

[malcolm]

reflowed everything, still no sound. please help?

[Randyman...]

I'm not Tim, but are you saying you are trying to test your J99 w/o the 990 Op Amps installed? I don't believe the J99 will pass any signal until the Op Amps are installed. If your voltages are OK at the Op Amp +/- sockets, you should be OK to plug them in AFAIK.