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No the noise is always there no matter if the light is on or off. my friend has more recent but still second hand 50/50 and his does make some noise, but not to the extent of mine. Yes i must try the pre amp valves. i dont have spares though. By taking them out and putting them in one by one...

Thanks for the response, Yeah im going to get it checked by a tech hopefully. The light problem may well just be a dodgy light bulb, but it is strange, surely if it was a problem with the bulb it would just not work?? As for the hum, it is there when the volume is turned to zero and worse when...

Any help would be great thanks

Hey, new to the board. Signed up cause i need some help with my mesa boogie 50/50. My set up is as follows Mesa 50/50 Poweramp (second hand, early ninties model) Rocktron Prophecy Preamp- Midi Foot controller Wah Guitar Been having problems with my sound, really bad hum coming from the 50/50...