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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Krell KBX Crossover Info Needed
Krell KBX Crossover Info Needed
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Old 17th February 2019, 05:25 PM   #11
Groove T is offline Groove T  Switzerland
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Join Date: Apr 2008
Location: Rapperswil at Lake Zürich
I had this problem to on one of my KBX, problem a was broken Transistor due broken cap, causing a broken resistor.

So you have to check out the specific stage, all is balanced, thus you can get reference values of parts, so you can desolder some parts and do measurings of Res. and Caps and you have a way to find the bug.

Yes , lots of work and patience.

Notice, often the trimpots for setting DC make problems to, this means, make picture of the pot position, move it with a screwdriver, take original position and check out if corrosion caused the problem.

Good luck.

Frank
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Old 18th February 2019, 11:30 AM   #12
willcycle is offline willcycle  United States
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Join Date: Oct 2003
Location: MD
I figured out the function of all pots and how to adjust them. DC offset is under 1 mV on all outputs.

I modified the network board to work with my speakers so between that and normal drift of components over 30 years there was a lot of DC offset (over 100 mV) initially which varied with the attenuator position. This was due to offset from the network board being attenuated with pot position.
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