No signs of anything burnt or scorched at all (though again, I haven't flipped the board - will tomorrow).Īny thoughts? I'm more used to things with tubes in them. Previous owner told me that a "resistor" had blasted apart, and indeed there was a small chunk of something rattling around in the amp, but that something looked like the plastic/rubber/whatever coating from an NTC thermistor, though the two in this amp aren't "blasted apart", and the amp wouldn't function at all without them. Haven't pulled the board out yet so I haven't checked for cold solder joints. Didn't bother with preamp, since it's completely disconnected for my testing. Here's the schematic for the power amp section: gallien-krueger-backline-600.pdf. Amp delivers plenty of power even while crackling, and fan turns on and off properly. Once the amp warms up enough to stop crackling (somewhere around 40☌ or ~100°f), noise at the output is around 1mv. I can see the noise when I probe Q14/18 base and emitter (perhaps it's coming from Q7A/Q7B, hmm.). Features 300W of thunder, 4-band active EQ, adjustable contour. Noise at the output is ~100mvP-P, and crackling can be up to 5vP-P, maybe higher (hard to catch on my analog scope). A Look at the Gallien Krueger Backline 600 Bass Head and Peavey 4x10 & 2x10 VTX Cabs from backline 210 amp Watch Video. The Gallien-Krueger Backline 600 Bass Head can handle the wear and tear of touring. Gallien-Krueger MB200 200W Bass Head 2010s - Silver. Gallien-Krueger Backline 210 2-Channel 175-Watt 2x10' Bass Combo. Power supply seems fine otherwise +-60v are nearly exact, +-35v and +-15v are within 10%, and no detectable noise on any of them. Gallien-Krueger Backline 600 2-Channel 300-Watt Bass Amp Head. It has distortion/sustain and clean channels, full 4-band active EQ, and an adjustable contour voicing filter. The Backline 350 2-channel bass head is the ideal solution for many bass players. ![]() Scoping the power supply rails, there's a bit of ripple on the +-60v but nothing that matches the crackling at the output. This product is no longer being manufactured or is not part of our offer. Includes Backline 350 175W 2-channel bass head, 210 BLX 2x10' bass cab, and 115 BLX 1x15' speaker cab. Hi all, I've got a Backline 600 that's giving me some nasty crackling and noise, which sometimes goes away after the amp warms up, even without the preamp board connected at all - meaning it's the power amp or power supply. Gallien Krueger Backline 600 Review + Sound test Chris S 39 subscribers Subscribe 83 Share Save 40K views 11 years ago Check out my band and leave a like :) I would really appreciate it.
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