RandomAudioGuy

Sorry to dig up this very old thread, but I too am looking for information and schematics on the LSA Integrated Amplifier (Signature). I inherited one recently and there is a loud hiss when it's on with no signal. The amp works, but the hiss is about 50% of the sound regardless of where the volume is at. I believe it's time to replace the tubes. I have contacted Underwood Hifi and the local previous local importer here and neither could provide any assistance. I'm hoping I can find some instructions on how to do this.