This is what I have found: The transistors used in the Denon DP6000 are 2SC458. They are notoriously noisy. The recommended replacements, among many are KSC1845, BC549, BC550.
The articles from AudioKarma related to repairs for noisy amplifiers. The Japanese site dealt with rebuilding the Denon DP6000 amongst many DD rebuilds.
Here are some links http://www.audiokarma.org/forums/showthread.php?t=284171
http://translate.google.com/translate?hl=en&sl=ja&tl=en&u=http%3A%2F%2Fsp-10.jp%2F%3Fattachment_id%3D794
The articles from AudioKarma related to repairs for noisy amplifiers. The Japanese site dealt with rebuilding the Denon DP6000 amongst many DD rebuilds.
Here are some links http://www.audiokarma.org/forums/showthread.php?t=284171
http://translate.google.com/translate?hl=en&sl=ja&tl=en&u=http%3A%2F%2Fsp-10.jp%2F%3Fattachment_id%3D794