PS: check speakers and cables used by your frriend, maybe it had some problem there and a click or pop caused by the ground lifting was the straw that broke the camel´s back.Ī camel which was already quite overloaded. This amp does not have a proper short circuit protection, but a mute.Īcceptable in a home Hi Fi amp, not enough in the rough stage life.
#Gallien kruger backline 600 pro
In a nutshell, reproduce, at the Lab, anything your friend can do on stage. 600 Bass Amplifier Rack Mount Bass Head Ampeg Svt-4 Pro Pro Bass Amplifier Head Watt Bass Guitar Combo Ampeg Svt-3 Pro Fender Rumble 15 Bass Hybrid Bass Amp Rack Mount Bass Amplifier Peavey Tour Genz Benz Bass Amp 1X12 Bass Combo Amp 350 Watt Bass Swr Workingman's Carbine Bass World Tour Bass Ampeg Svt-3 Pro Bass 300W Bass Amp Cube Bass Bi-Amp Bass Series Bass Amplifier Head 12 Bass Combo 450. (here you might use a resistor instead of a speaker, for sanity).Ĭheck it regularly for undue heating, weird waveforms, something strange.
#Gallien kruger backline 600 full
Let it cook for a couple hours at full power. If all looks well, plug it straight into the power line, load it and apply a steady tone to it (400Hz, 1KHz, your choice) raising power step by step until clipping. It might be unstable, on the verge of oscillation. 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.Can't talk about the ground switch, it should damage nothing, but maybe this guy had some weird ground problem and it raised its ugly head when lifting, so in an indirect way it might have somethiong to do.Īnyway: rebuild your amp, test it first with bulb limiter without load, then add a speaker load without turning it off, inject some signal and scope the output.
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. Gallien-Krueger MB115 1x15' 200-watt Bass Combo Amplifier.
Gallien-Krueger 410BLX-II Backline Bass Cabinet Local PICK UP ONLY 8ohm 400w. I can see the noise when I probe Q14/18 base and emitter (perhaps it's coming from Q7A/Q7B, hmm.). Gallien Krueger GK Backline 600 2-Channel 300 Watt Bass Guitar Amplifier Head. Noise at the output is ~100mvP-P, and crackling can be up to 5vP-P, maybe higher (hard to catch on my analog scope). Power supply seems fine otherwise +-60v are nearly exact, +-35v and +-15v are within 10%, and no detectable noise on any of them. Scoping the power supply rails, there's a bit of ripple on the +-60v but nothing that matches the crackling at the output. 300 watt (4 ohms) Active 4-band EQ Effects Loop, Tuner Out med Mute XLR out Kb og slg bde nye og brugte nye varer p DBA du finder over 1 mio.
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. Basamplifier, Gallien Krueger Backline 600, 300 W, Velholdt bass top.
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