Wonderful middle. The amplifier has been running for more than 20 years in the family and it always took more whimsical features to: volume was no longer finely dosed, pops and crackles ... or stayed away completely, since the complete Musizierensemble on CD could still try so .. . It was no longer beautiful. Had disassembled the amplifier, cleaned with compressed air in advance, and then with this agent (s) impregnated. It flushes out all the "impurities" of the ferrite disks and now he's back as out of the store. Note: In smokers, the procedure should be repeated a second time and last "spraying" can only drain more and rausgelaufenens wiped.