stingrayfan Posted March 19, 2011 Posted March 19, 2011 My Hartke LH500 started to make a low pitched hum at last rehearsal and gig after being used in anger, so decided to replace the pre-amp valve. The good news for you LH500 owners is, it's a pretty easy job. Unscrew the top lid of the head and you'll see the tube under a silver cone. Twist this off to reveal the valve. Gently wiggle out and replace with new valve. Replace valve cover. No hum on low volume test - will use in anger at rehearsal next week to properly find out if it has gone. Hope so! [attachment=75149:IMAG0398.jpg] [attachment=75150:IMAG0400.jpg] [attachment=75151:IMAG0401.jpg] [attachment=75152:IMAG0403.jpg] Quote
fatgoogle Posted March 19, 2011 Posted March 19, 2011 What valve did you use. Im thinking of changing the one in mine to see if i can get some more growl to it. Quote
stingrayfan Posted March 20, 2011 Author Posted March 20, 2011 Electro Harmonix - it's the box in that last picture. Cost a tenner. There was a Sovtek in there before. Hope it doesn't dirty sound - I love the warm, clean tone from this head! Quote
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