Variac on zero, power switch off- connect power cord. 2). Connect either output to load box (load A). 3). Resistance loads open (switch in. Gallien Krueger rb Schematic Diagram. Uploaded by esquisof. Gallien Krueger rb Schematic Diagram. Copyright: © All Rights Reserved. Download as. Hello, Service Manual of the Gallien Krueger rb this is a amp for bass, there are layout, pcs, schematics for preamp and poweramp.

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I’ll probably just remove the chip and jump the pins. For example, I’d rather have reverb always on that be stuck in one channel. This makes me wonder if one of the other parts is still sick. I know their krheger. I think the divider values are about 50 times too small. If this ohm resistance is to make significant change in bias, it must be a fairly large part of the total resistance divider.

My version of the power amp is page 7. Q4 Q5 flow about 4mA 0. That bias circuit reads wrong to me. Thread Tools Show Printable Version. CJ Member California Posts: We need about six times 0. I believe the bias never worked as intended. Despite not knowing much about transistors I’m pretty sure they’re supposed to be soldered to 400db circuit board.


You need some mildly expensive lessons before you try this on a W, especially a “beloved classic”. I don’t have much faith in the work that was done to it before I got it.

Gallien-Krueger 400RB Service Manual

Started by skipwave The Lab. Started by 3nity Drawing Board. There’s a transistor, the trim-pot, two 1K resistors, and two more resistors. Soundcraft b schematic Started by Ghengis The Lab. If I can’t fix it, I can fix it so nobody else can! January 04, If this does not happen, the amp gets hot, idles at higher temp, gets hotter yet, and goes into “run-away”. February 19, You are unable to reach 0.

On amps with more than onesometimes you can move them around. The schematics I got have several versions of the power amp.

If your wondering about the NTE parts use their online cross reference http: Here’s what I’ve done so far Since I really like how the preamp sounds I’ve been thinking about ditching the gal,ien amp and installing something else. The resistance divider current must be “much” higher. Not sure, but that TL chip may be out.

What’s wrong with the bias? I’ll keep replacing resistors but if anyone could help me figure out a way to keep it powered on long enough to measure some voltages that’d be a big help. When things went wrong, the krueegr would fall very fast, the resistors get hot instead of the transistors.


The watt amp schematic would be good to have if avaiable too.

I’ve been looking over the data sheets, and seems close, but another set of eyes that’s familiar with transistor specs would be greatly appreciated. Again–I’m sorry for being a deadbeat on this. Maybe one of these hypex class D modules. I would like a pdf copy of the schematic if possible. Their parts department would sell you one. GK rb fan issue? Galliwn can I use??

Help repairing Gallien Krueger B

November 20, CJ, thanks for the context regarding the topology. I’ll sit down this weekend and measure about, that’s really helpful info PRR. Started by Ghengis The Lab.

A ohm resistor would be “right”, except it has an all-wrong temperature coefficient. I’d put these in series with the power rails. Hey everyone, my apologies for having galkien absent from this particular thread for so long.