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So I traced the circuit again and it appears there was a bad connection on a resistor. I replaced it wit the same value and it has minimized the hiss. I'll ultimately try and verify I have no ground loop issues and if that does;t quiet her down I'll try and upgrade the transistors. Thanks again.

Hello TapeOp. I have acquired an Altec 1589b. I recapped the entire unit, have 3 1588b preamps and have a hiss in my output. I've traced back with an audio probe thru the circuit and hear an audible hiss in the AL2712 transistor and the corresponding resistors. I've checked the voltage at the AL2712...

I have 2 Stevenson Interface Electronics 100q's. They are missing the joystick and related circuit so I was thinking of just racking up these as some preamps disabling the 4 quad cues. Does anyone have any pinout info. I saw in photos earlier in this thread mentioning 33.5vdc power and the line/ xlr...