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Troubleshooting my Laney Head


Huw
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Well I decided to blow the dust of the Laney DP 150 that I got off eBay a short while ago. Just for home playing, while my regular head is at our practise room.

I've only tried it a couple of times before. The first time, I couldn't get a sound out of it, so tried turning it all the way up while banging on the strings. BLAM! The sound came on at full volume but once I turned it down to a manageable volume, it was fine for as long as I wanted to play it. I turned it on a few times in the week after and it was acting normal, again.

It's been a couple of months, so I just tried it this evening. Starting off much like the first time I tried it; no sound until I turned it all the way up, then it comes to life but now whenever I turn it back to the manageable volume, the signal just fades off and dies. I can turn it back all the way up and have the sound pop back, but I'll turn it down and the signal goes again.

I tried different speaker cables and instrument cables but the same problem across the board. I tried the headphone jack and the same output problem through the speakers occurs in the headphones, so I guess its a problem in the head, rather than the cab.

So, anyone had anything similar or think you know how to fix it?

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when you turn up the volume do you get a slight crackling noise?
i get something similar if i dont use my bass for a while but turning up and down (not while playing) seems to clean the pot, maybe a corse of action you could try, like merton says it could well be dirty/lightly corroded

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I'll have a look at cleaning up any contacts I can find on the pots and jacks tonight.


One other note though; trying to explain what's happening a little better.

I turn the volume up a bit, banging on the strings and I [i]can [/i]hear the signal but very quiet and fuzzy. I have to basically slap the E string as loudly as possible to make the signal pop through.

(rather than it just being no signal at all one minute, then full volume)

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I recently got a couple of Laney amps out from disuse in order to sell them. One, either a PB150 or a DP150, had a similar problem, though I didn't spend much time on checking whether I could hear anything at low volumes, just nipped out to Maplin and bought some switch cleaner and sprayed the pots and sockets, and everything was cured.

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Tonight it's working fine (so far). Maybe it needed a bit of a warm up.

Incidentally, how do you use switch cleaner? Do you have to open it up and spray it on, or do it externally?

Edited by Huw
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