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 sure looks like you should have plenty. Q9 is a small Darlington with gain over 2, I was working 60 hours a week for many years, so had little to no time I can’t remember if GK has a few of those chips, but you might want to contact them to see if they still have some “reserve” stock, just for this purpose. You didn’t drag a hundred pounds to under-whelm the bar’s ventilation rumble.

I’d put these in series with the power rails. Started by Ilya The Lab. CJ Member California Posts: More will cook, today or next summer. November 20, However if connected wrong, the amp will burn-up at turn-on.


Originally Posted by Krudger On amps with more than onesometimes you can move them around.

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. Let me know what else I can do to help you guys help me.

This makes me wonder if one of the other parts is still sick. Also, will add more if I find the other ones too.

You tell me whar schemattic man gits his corn pone, en I’ll tell you what his ‘pinions is. But will be a little rough-throat sounding around the 1W level.

Gallien-Krueger 400RB Service Manual

Their parts department would sell you one. Please try to post it here, for future reference for others. Votes for the wrong politicians? I’m turning some of them back on.

GK RB schematic

Also, it’s generally not as loud as it should be. Per the tech note on the schematic measured across Q13E and Q14E, adjusting R49 did very little, 9mv is about the highest it will go, 7mv the lowest. I’ll probably just remove the chip and jump the pins. Assume the total is 1K to 2K. The 2nd one is the right one. Results 1 to 15 of The watt amp schematic would be good to have if avaiable too.


This scenario is the same as having the boost on all the time. Peavey used a ton of the TL back in the s.

August 23, By methodofcontrol in forum Other Amps. I believe the bias never worked as intended. For example, I’d rather have reverb always on that be stuck in one channel. gzllien

January 04, Gallien-Krueger RB, got schemo, need help fixing. You need some mildly expensive lessons before you try this on a W, especially a “beloved classic”.

If 400eb wondering about the NTE parts use their online cross reference http: CJ, thanks for the context regarding the topology. What can I use??

The resistance divider current must be “much” higher. I’ve done this for several of my customers who didn’t want to bother with a replacement. Here’s a list of what I’ve done and what the results were thus far