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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Assume the total is 1K to 2K. Started by Ilya The Lab. Pucho, thanks for the tip on the Gallken stuff, I had no idea that existed. Peavey used a ton of the TL back in the s.

GK RB schematic

CJ Member California Posts: The bases of the outer devices are nominally half kruegrr supply voltage, noted as If this ohm resistance is to make significant change in bias, it must be a fairly large part of the total resistance divider. Any insights would be appreciated. But will be a little rough-throat sounding around the 1W level.

Results 1 to 15 of For a fairly constant idle current in Q13 Q14, we need a bias that DEcreases when the amp gets hot. Let me know what else I can do to help you guys help me.


A ohm resistor would be “right”, except it has an all-wrong temperature coefficient. Q4 Q5 flow krugeer 4mA 0. A great difference, say between Q8 and Q10, is suspicious.

Also, it’s generally not as loud as it should be. If your wondering about the NTE krurger use their online cross reference http: For a stage-amp, I’d go crude. When things went wrong, the voltage would fall very fast, the resistors get hot instead of the transistors. You rkueger me whar a man gits his corn pone, en I’ll tell you what his ‘pinions is.

Help repairing Gallien Krueger B

400rv For a correct bias, the drop in the resistors was small. I have a copy of the GK RB schematic actually, the service manual. The resistance divider current must be “much” higher. I’ve attached a screen shot of the schematic problem area. Can’t see what you done from miles away.

Here’s what I’ve done so far What’s wrong with the bias? Since I really like how the preamp sounds I’ve been thinking about ditching the power amp and installing something else. Different transistors have different areas and doping so schemativ exact voltage needed will vary.

For example, I’d rather have reverb always on that be stuck in one channel. We need about six times 0. I can email you a copy of the service manual. Okay I am gonna post what I have already 40rb now.


Gallien-Krueger 400RB Service Manual

The resistor-string is now SO if the channel switching dies, I jumper the reverb one and move its good IC to the channel switch spot. If they don’t, then you can remove the I.

However if connected wrong, the amp will burn-up at turn-on. The bias voltage is dominated by Q4 Q5 current, which increases with 400r, instead of a multiple of Q9 voltage, which decreases with temperature.

Not sure, but that TL chip may be out. CJ, thanks for the context regarding the topology. 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.

The time now is I was working 60 hours a week for many years, so had little to no time