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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Here’s what I’ve done so far CJ Member California Posts: 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. February 19, Krufger obvious solution is: Here’s a list of what I’ve done and what the results were thus far A ohm resistor would be “right”, except it has an all-wrong temperature coefficient. The 2nd one is the right one.


When things went wrong, the voltage would fall very fast, the resistors get hot instead of the transistors. It’s a little hard to identify which resistor it is since at kruegger point that area of the pcb is fairly blackened. When the going gets weird For a stage-amp, I’d go crude. I’d put these in series with the power rails.

You didn’t drag a hundred pounds to under-whelm the bar’s ventilation rumble. Peavey used a ton of the TL back in the s. This scenario is the same as having schemayic boost on all the time. Not as cheap as a jumper wire, but if you want to keep control over that switchable function it is worth the price. GK rb fan issue? Education is what you’re left with after you have forgotten what you have learned. Also, will add more if I find the other ones too.

Gallien-Krueger 400RB Service Manual

Let me know what else I can do to help you guys help me. Please try to post it here, for future reference for others.

I know their obsolete. One of the replacement transistors was mounted but never soldered, next to it was a fried resistor. PNP will tend to be 0. I’ve gotten pretty good with tubes but I don’t know anything about transistors so looking kruegdr the schematic and the circuit board it’s not adding up to me.


I’m turning some of them back on. Can’t see what you done from miles away.


Since I really like how the preamp sounds I’ve been thinking about ditching the power amp and installing something else. Also, it’s generally not as loud as it should be.

Since my last post I’ve been enjoying this amp, the output was a little hairy at power up but I’m using it in a punk band. By methodofcontrol in forum Other Amps.

We need about six times 0. I’ll probably just remove the chip and jump the pins. Different transistors have different areas and doping so the exact voltage needed will vary.