Fix Fault Hartke

When powered up, silence, then it starts to hum and get louder, then goes pop and starts again continuously until switched off. the bass is not plugged in and the volume controls etc make no differen ... more

My Hartke HA4000 amp cuts out any ideas please. I've changed the fan (twice) but it still cuts out. Hadit running with an audio signal very loud for about 4/5 hours 'til it was very hot & it was ok, s ... more

My amp powers on without a hitch, but when I play it makes a farting/phaser sound when I pluck a string. Any advise/suggestions to remedy my problem?

So I recently bought a Hartke LH500 bass amplifier and a GK410BLX cab along with it. Everything had been working fine until yesterday, now when I hook the amp up to the cab all I get is static noise w ... more