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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Gallien-Krueger 400RB Service Manual

For a correct bias, the drop in the resistors was small. Can someone check me? So first question, are these compatible?

Pucho, thanks for the tip on the NTE stuff, I had no idea that existed. Attached Files RB Preamp I can’t remember if GK has a few of those chips, but you might want to contact them to see if kruege still have some “reserve” stock, just for this purpose.

I’d want to do it different. Glad to see someone go the RB schematics uploaded. Again–I’m sorry for being a deadbeat on this. Let me know what else I can do to help you guys help me. You tell me whar a man gits his corn pone, en I’ll tell you what his ‘pinions is. The schematics I got have several versions of the power amp. Here’s a list of what I’ve done and what the results were thus far Started by skipwave The Lab.


However in a W amp you need W resistors to handle disaster gracefully.


For a stage-amp, I’d go crude. GK rb fan issue? I’ve gotten pretty good with tubes but I don’t know anything about transistors so looking at the schematic and the circuit board it’s not adding up to me. We need about six times 0. In the mean time I’ll have to read that a few more times.

ggallien I’ve been looking over the data sheets, and seems close, but another set of eyes that’s familiar with transistor specs would be greatly appreciated. If you don’t use a footswitch to boost, than this is not only acceptable, but no different than having the I. Ass-uming that the output two triple-Darlingtons needs six times 0.

If I can’t fix it, I can fix it so nobody else can! It sure looks like you should have plenty. But will be a little rough-throat sounding around the 1W level. What’s wrong with the bias? The weird turn pro! Okay I am gonna post what I have already right now. August 23, I would appreciate the schematic for the B or service manual – THX. Scchematic need some mildly expensive lessons before you try this on a W, especially a “beloved classic”. Please try to post it here, for future reference for others.


Fixed that up, things are pretty good now, but it still won’t bias right. Gallien-Krueger RB, got schemo, need help fixing. Bookmarks Bookmarks Digg del. Soundcraft b schematic Started by Ghengis The Lab.

The bias voltage is dominated by Q4 Q5 current, which increases with temp, instead of galilen multiple of Q9 voltage, which decreases with temperature.

By methodofcontrol in forum Other Amps. Q4 Q5 flow about 4mA 0. I’ve attached a screen shot of the schematic problem area. Since my last post I’ve been enjoying this amp, the output was a little hairy at power up but I’m using schejatic in a punk band. If they don’t, then you can remove the I. Since I really like how the preamp sounds I’ve been thinking about ditching the power amp and installing something else.

If this ohm resistance is to make significant change in bias, it must be a fairly wchematic part of the total resistance divider. Q9 is a small Darlington with gain over 2,