stevem Messages: 4733 Registered: June 2004 Location: NY
Senior Member
Well over a year ago now while at rehearsal and using one of my basses with a 18 volt active preamp I damaged my selectone channel in one of my K250 heads when it started to produce a ton of hiss.
Just over the weekend I got to look into the issue and had to replace the 14 pin duel section IC chip to fix it.
So you folks with active preamps in your guitars and or using stomp boxes that can add to signal input levels in to the amp beware of driving these 250 and K150 heads with too much signal into them!
These amps where not made to need that hot a input signal level to drive them to full output wattage.