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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It’s a little hard to identify which resistor it is since at this point that area of the pcb is fairly blackened.

Help repairing Gallien Krueger B

Not sure, but that TL chip may be out. Please try to post it here, for future reference for others. Hey everyone, my apologies for having been absent from this particular thread for so long.

I’d want to do it different. One of the replacement transistors was mounted but never soldered, next to it was a fried resistor.


Votes for the wrong politicians? A ohm resistor would be “right”, except it has an all-wrong temperature coefficient.

I’m turning some of them back on. Here’s a list of what I’ve done and what the results were thus far Results 1 to 15 of Here’s what I’ve done so far Can’t see what you done from miles away.

Originally Posted by gibsonripper. Assume the total is 1K to 2K. Started by skipwave The Lab. CJ Member California Posts: By methodofcontrol in forum Other Amps. Glad to see someone go the RB schematics uploaded.

Gallien-Krueger 400RB Service Manual

Can someone check me? I’ll just use the pdf’s you sent. February 19, When things go wrong, it gets VERY expensive fast. Ass-uming that Q9 is exactly 1.

When the IC krrueger history, they made up a small board with long pins, you install it in the same pc board holes and it does the function. Originally Posted by DrGonz The bias voltage is dominated by Q4 Q5 current, which increases with temp, instead of a multiple of Q9 voltage, which decreases with temperature.

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Kruger amps with more than onesometimes you can move them around. When things went wrong, the voltage would fall very fast, the resistors get hot instead of the transistors. Any insights would be appreciated.

Bookmarks Bookmarks Digg del. I can’t remember if GK has a few 400rh those chips, but you might want to contact them to see if they still have some “reserve” stock, just for this purpose. Despite not knowing much about transistors I’m pretty sure they’re supposed to be soldered to the circuit board.


You tell me whar a man gits his corn pone, en I’ll tell you what his ‘pinions is. Q9 is a small Darlington with gain over 2, When the going gets kruegef I know their obsolete.

January 04, ,