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Krossroad 500 "pops" when powered off [message #28767] Sat, 17 September 2022 13:22 Go to previous message
rodak
Messages: 516
Registered: October 2001
Location: Georgia
Senior Member
I've got this Krossroad 500 that I resurrected many years ago. When I got it, two of the power transistors were fried (one each from two different pairs), and the solder traces were pretty burned. I got it working again by just pulling out the other transistor in each pair and cleaning up the circuit board. It worked, and still works now, but lately it's taken to making a loud "pop" when I turn off the power. It's loud enough that I fear for the speakers' health. Of course, I have no schematics for the amp - do you guys have any suggestions about what the issue might be? I know the amp has a circuit that doesn't enable the speaker output until a couple of seconds after power-on, wondering if it's supposed to work in reverse at power-off, but isn't.

Also, comparing it side-by-side with my K200-2 with 3x12s, I've decided that I really don't care for the sound of the Krossroad, neither the amp nor the speakers. The 3x12 isn't even really a bass cabinet, but it sounds much better as a bass rig than the Krossroad, imho. It's beautiful green sparkle Naugahyde, but I'm thinking about selling it anyway. I've never really been thrilled with the sound, but I've only used it a few times since I bought it, something like 15 years ago, so I figured I just hadn't messed with it enough, but side by side with the K200, it just doesn't pass muster. I'd like to get that "pop" fixed first, though.

www.combo-organ.com

[Updated on: Sat, 17 September 2022 19:31]

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