af claus » 14. okt 2012, 17:37
Hi Frans..
Then I received my brand new amplifier. Solderdude maybe you can help.
First open a big box out with amp, admire it a little, then add the pipes and take it up in the living room, connect the CD afspillern put a CD in, turn on the CD, plug the headphones into the amp turn amp THEN COMES TO THE meanest growl AUDIO OUT OF headphones. Great is my disappointment.
The most strange thing is that when I turn off the amp keeps humming sound up as the music fades out.
here's a guy in England who have the same problem:
The facts:
• Amp running is on 240v 50Hz mains in the UK.
• I have tried different power sockets, a different location, running without an earth, running through a UPS.
• Hum is not påvirket by volume.
• Hum does not seem to be påvirket much by using different valves and swapping valves left to right (see list below).
• Hum still exists tabloid is no source connected (just power lead and the headphones).
• Hum is louder when on Hi impedance setting.
• During the start-up process, når slow start protection circuit switches two full power the hum increases.
• The capacitors look OK, saying att I'm no expert, but do not the seem two be bulging.
• The power lead is nothing special but I can not see att making Any difference.
beste greetings claus