Leftbass Posted April 22, 2012 Share Posted April 22, 2012 My Hartke LH1000 went off in rehearsal today. It didn't feel hot anywhere. Its in a 2U rack so I coudn't check it properly till I got home. After taking the lid off I couldn't find an internal fuse anywhere. This is a bit odd as its usually in line on the power input. Anyway has anyone had a similar experience with these amps? I'll be taking it to amp repair man tomorrow but thought I'd pick your brains first. Wall plug fuse okay too. I had it hooked up to an 8ohm hydrive cab Quote Link to comment Share on other sites More sharing options...
Dood Posted April 22, 2012 Share Posted April 22, 2012 Hmmmm, nooo, I've not heard anything 'up' with the LH heads doing that. How were you connected to the cab? Bridged or dual mono config? Quote Link to comment Share on other sites More sharing options...
Leftbass Posted April 22, 2012 Author Share Posted April 22, 2012 Cheers Dood, Bridged from the speakon socket. The cabs are rated at 1000watts Quote Link to comment Share on other sites More sharing options...
MarkBassChat Posted April 23, 2012 Share Posted April 23, 2012 Have you checked directly below the power supply cord? The fuse is integrated with the power supply socket. You don't need to open the amp to check the fuse. Mark Quote Link to comment Share on other sites More sharing options...
Leftbass Posted April 23, 2012 Author Share Posted April 23, 2012 Yeah thanks Mark. My techie friend found it straight away. Looks like an output ttansistor has gone! May be more damage too. Parts on the way I'm told. Quote Link to comment Share on other sites More sharing options...
steve-bbb Posted April 23, 2012 Share Posted April 23, 2012 is it worth getting the cab checked over too? is it possible for a dodgy connection somewhere inside the cab to affect the impedance and then change the power draw on the head? Quote Link to comment Share on other sites More sharing options...
Leftbass Posted April 27, 2012 Author Share Posted April 27, 2012 Problem solved guys. If you hear something rattling around inside your amp be sure to get it checked out. Unfortunately with my amp being in a rack the faint sound of a rogue screw ( which by the way did not even belong in the amp! ) moving around went undetected until it bridged between chassis and transistor. All repaired now though and ready to do some demolition work I mean play sweet music. Quote Link to comment Share on other sites More sharing options...
MarkBassChat Posted April 28, 2012 Share Posted April 28, 2012 This is very funny - few years ago I was fixing HA3500, which had exactly the same problem; a screw (also not belonging to the amp) shorted a transistor from the power amp to chassis. I had to replace several transistors. Mark Quote Link to comment Share on other sites More sharing options...
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