LSC trouble

[JoeVFR]

Hey all,

Quick question...
My LSC has static and noise on channel one (intermittent). I have checked guitar cables etc. Noise is only on channel one. I have swapped pre-amp tubes one at a time, but still cannot isolate source. I can change the noise by making adjustments with treble pot. I have used contact cleaner on pot, still noisy. Also, when I switch the loop bypass in and out, it seems to affect it. Channel two is totally fine. My guess is pre-amp tube, any other suggestions would be appreciated...

Thanks

 

[tle4]

Are you using reverb on both channels? If you are only using it on the clean channel...... try swapping the reverb tube.

 

[rfrakes]

Got ot the MB website and email Tien and ask if tle suggestion, a good one doesn't cure it.

 

[JoeVFR]

I checked suggestion with reverb, no difference. The treble pot and loop bypass seem to affect it the most. Channel 2 is totally fine regardless of reverb or loop settings...

 

[djw]

Try applying some contact cleaner to the effect loop jacks. This has been known to fix symptoms a lot like you describe.

 

[tle4]

Is the clean channel in 100 watt mode and channel 2 in a lower power setting? Maybe it is a power tube. Try the clean channel in a lower wattage setting or the same setting as the dirty channel if they are different. if that don't work try replacing v1 preamp tube.

I would think that if it was th loop jacks it would happen on both channels

 

[user 35567]

I just had the exact same problem with my LSC. Problem was due to some bad plate load resistors. Hope this helps you out.