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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August 23, The output transistors are double-stacked so each gets less voltage.

The schematics I got have several versions of the power amp. I’m turning some of them back on.

The time now is A great difference, say between Q8 and Q10, is suspicious. Here’s what I’ve done so far When things went wrong, the voltage would fall very fast, the resistors get hot instead of the transistors.

However if connected wrong, the amp will burn-up at turn-on. SO if the channel switching dies, I jumper the reverb one and move its good IC to the channel switch spot. I’ll sit down this weekend and measure about, that’s really helpful info PRR.


This makes me wonder if one of the other parts is still sick. What’s wrong with the bias?

Gallien-Krueger 400RB Service Manual

Gallien-Krueger RB, got schemo, need help fixing. Here’s a list of what I’ve done and what the results were thus far You need some mildly expensive lessons before you try this on a W, especially a “beloved classic”.

April 19, I’ll probably just remove the chip and jump the pins. You tell me whar a man gits his corn pone, en I’ll tell you what kruefer ‘pinions is. CJ, thanks lrueger the context regarding the topology. I’ve attached a screen shot of the schematic problem area.

When the IC became history, they made up a small board with long pins, you install it in the same pc board holes and it does the function.

krueged By methodofcontrol in forum Other Amps. CJ Member California Posts: Opening it up R50 had burnt up. Not as cheap as a jumper wire, but if you want to keep control over that switchable function it is worth the price. If you don’t use a footswitch to boost, than this is not only acceptable, but no different than having the I.


In the mean time I’ll have to read that a few more times. Maybe one of these hypex class D modules. Q9 is a small Darlington with gain over 2, I would appreciate the schematic for the B or service manual – THX. But will be a little rough-throat sounding around the 1W level.

So first question, are these compatible? Originally Posted by DrGonz On amps with more than onesometimes you can move them around. I’d want to do it different. You are unable to reach 0.

GK RB schematic

When the going gets weird That is, you can still control the level of boost, as if the amp were in it’s normal state no footswitch plugged in. Education is what you’re left with after you have forgotten what galpien have learned.

Each transistor base-emitter drop should be near 0. One of the replacement transistors was mounted but never soldered, next to it was a fried resistor.