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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Help repairing Gallien Krueger B

Gallien-Krueger RB, got schemo, need help fixing. Originally Posted by gibsonripper. However if connected wrong, the amp will burn-up at turn-on. Started by skipwave The Lab.

The schematics I got have several versions of the power amp. SO if the channel switching dies, I jumper the reverb one and move its good IC to the channel switch spot. February 19, Pucho, thanks for the tip on the NTE stuff, I had no idea that existed. Please try to post it here, for future reference for others. Any insights schsmatic be appreciated. Again–I’m sorry for being a deadbeat on this. CJ, thanks for the context regarding the topology.

It sure looks like you should have plenty. Their parts department would sell you one.


November 20, I’ll probably just remove the chip and jump the pins. Education is what you’re left with after you have forgotten what you have learned. Started by Ilya The Lab. If it actually takes most of 4mA, the base current is less than 2uA. 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.


Despite not knowing much about transistors I’m pretty sure they’re supposed to be soldered to the circuit board. If this ohm resistance is to make significant change in bias, it must be a fairly large part of the total resistance divider.

August 23, Thread Tools Show Printable Version. Opening it up R50 had burnt up. I’d put these in series with the power rails. More will cook, today or next summer. This scenario is the same as having the boost on all the time. Hey everyone, my apologies for having been absent from this particular thread for so long. You are unable to reach 0.

I would appreciate the schematic for the B or service manual – THX. Soundcraft b schematic Started by Ghengis The Lab. Since I really like how the preamp sounds I’ve been thinking about ditching the power amp and installing something else. For a correct bias, the drop in the resistors was small.

The watt amp schematic would be good to have if avaiable too. Glad to see someone go the RB schematics uploaded. For a fairly constant idle current in Q13 Q14, we need a bias that DEcreases when the amp gets hot. You tell me whar a man gits his corn pone, en I’ll tell you what his ‘pinions is. That bias circuit reads wrong to me. Peavey used a ton of the TL back in the s.


Gallien-Krueger 400RB Service Manual

A ohm resistor would be “right”, except it has an all-wrong temperature coefficient. What’s wrong with the bias?

Here’s a list of what I’ve done and what the results were thus far In the old days I had and 10 ohm resistors at 10 or 20 Watts. I think the divider values are about 50 times too small. The bias voltage is dominated by Q4 Q5 current, kruegre increases with temp, instead of a multiple of Q9 voltage, which decreases with temperature.

Okay I am gonna post what I have already right now. April 19, Each transistor base-emitter drop should be near 0.

PNP will tend to be 0. Ass-uming that Q9 is exactly 1. I don’t 400rg much faith in the work that was done to it before I got it.

I’d want to do it different. Results 1 to 15 of 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.