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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January 04, That is, you can still control the level of boost, as if the amp were in it’s normal state no footswitch plugged in.


Assume the total is 1K to 2K. I’ll sit down this weekend and measure about, that’s really helpful info PRR. But will be a little rough-throat sounding around the 1W level. I know their obsolete.

GK RB schematic

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

I would appreciate the schematic for the B or service manual – THX. 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. Started by 3nity Drawing Board. The output transistors are double-stacked so each gets less voltage.

Gallien-Krueger 400RB Service Manual

There’s a transistor, the trim-pot, two 1K resistors, galien two more resistors. 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. I would like a pdf copy of the schematic if possible. Q4 Q5 flow about 4mA 0. When things go kruegee, it gets VERY expensive fast.

Soundcraft b schematic Started by Ghengis The Lab. Peavey used a ton of the TL back in the s.

It sure looks like you should have plenty. Here’s what I’ve done so far I’m turning some of them 400db on. Education is what you’re left with after you have forgotten what you have learned.

SO if the channel switching dies, I jumper the reverb one and move its galkien IC to the channel switch spot. CJ Member California Posts: February 19, When things went wrong, the voltage would fall very fast, the resistors get hot instead of the transistors. The bias voltage is dominated by Q4 Q5 current, which increases with temp, instead of a multiple of Q9 voltage, which decreases with temperature.


CJ, thanks for the context regarding the topology. More will cook, today or next summer. Different transistors have different areas and doping so the exact kruefer needed will vary.

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.

The 2nd one is the right one. Gwllien put these in series with the power rails. If you don’t use a footswitch to boost, than this is not only acceptable, but no different than having the I.

Started by Ghengis The Lab. Good morning, for sentimental reasons I picked up a Gallien Krueger B, it’s an earlier version of the popular RB but it’s all discreet along the lines of an old Sunn or Acoustic.

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. You didn’t drag a hundred pounds to under-whelm the bar’s ventilation rumble. In the gwllien time I’ll have to read that a few more times. PNP will tend to be 0.