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Old 12th August 2010, 12:05 AM   #1
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Default Laney guitar amp, pre amp is dead

My trusty Laney DP150 bass guitar amp died a while ago and I've been using the power amp section with a graphic EQ pedal since then. Tonight I decided to give it another go and theres still no signal thru the front end, but in addition there is a squealing noise when either the pre or post gain knobs are turned down. Also, the pre amp overload LED is on all the time so that might be a clue? I'm fine with valve amps, but this one has me guessing. If anyone here is able to assist, I can forward the schematic (by e mail) as supplied to me by Laney, but it wont let me copy it onto here. Cheers, Steve.
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Old 12th August 2010, 11:35 AM   #2
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Bumping this before itvanishes altogether! No tech heads out there?
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Old 12th August 2010, 01:10 PM   #3
burbeck is offline burbeck  United Kingdom
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hi steve
email me for more info and advise

regards
bob
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Old 13th August 2010, 04:17 PM   #4
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e mail sent
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Old 13th August 2010, 10:58 PM   #5
Enzo is offline Enzo  United States
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First check the preamp power supplies. I forget on those, but it will likely be either +/-12VDC or +/-15. A missing or very low voltage can fool the system into thinking it is clipping, and can cause symptoms as you decribe.
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Old 13th August 2010, 11:15 PM   #6
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Thanks for that tip but no, the voltages are well up.
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Old 18th August 2010, 07:29 PM   #7
burbeck is offline burbeck  United Kingdom
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did not get email steve
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