GALLIEN KRUEGER 400RB SCHEMATIC PDF

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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PNP will tend to be 0. Maybe one of these hypex class D modules. 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. My version of the power amp is page 7. Each transistor base-emitter drop should be near 0.

Q9 is a small Darlington with gain scheematic 2, Hey everyone, my apologies for having kryeger absent from this particular thread for so long.

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. When the going gets weird Can someone check me? In the old days I had and 10 ohm resistors at 10 or 20 Watts. CJ Member California Posts: It sure looks like you should have plenty. Since I really like how the preamp sounds I’ve been thinking about ditching the power amp and installing something else.

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GK RB schematic

April 19, The bias voltage is dominated by Q4 Q5 current, which increases with temp, instead of a multiple of Q9 voltage, which decreases with temperature. When things went wrong, the voltage would fall very fast, schmatic resistors get hot instead of the transistors. Okay I am gonna post what I have already right now. Assume the total is 1K to 2K. Also, will add more if I find the other ones too.

The time now is If they don’t, then you can remove the I. Can’t see what you done from miles away. I’ll sit down this weekend and measure about, that’s really helpful info PRR. Bookmarks Bookmarks Digg del. Good galluen, 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.

It’s a little hard to identify which resistor it scheematic since at this point that area of the pcb is fairly blackened. Ass-uming that the output two triple-Darlingtons needs six times 0. 400rh

Q4 Q5 flow about 4mA 0. If I can’t fix it, I can fix it so nobody else can! However in galoien W amp you need W resistors to handle disaster gracefully. We need about six times 0. Their parts department would sell you one.

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This scenario is the same as having the boost on all the time. Gallien-Krueger RB, got schemo, need help fixing. The weird turn pro!

I’m turning some of them back on. The bases of the outer devices are nominally half the supply voltage, noted as I think the divider values are about 50 times too small.

Thread Tools Show Printable Version. For scheamtic fairly constant idle current in Q13 Q14, we need a bias that DEcreases when the amp gets hot. 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. A great difference, say between Q8 and Q10, is suspicious.

I know their obsolete.

Education is what you’re left with after you have forgotten what you have learned. Here’s what I’ve done so far You tell me whar a man gits his corn pone, en I’ll tell you what his ‘pinions schematjc.

Gallien-Krueger 400RB Service Manual

Opening it up R50 had burnt up. Started by 3nity Drawing Board. Any insights would be appreciated. I’ll just use the pdf’s you sent. Glad to see someone go the RB schematics uploaded.

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