I took this from manual and drew in the info you requested. This is how I have it hooked up right now and it sounds great. But would it be best to run the tube amp into the pioneer amp's tape in or aux in?
PC USB > DAC > tube amp input > tube amp output > Pioneer SA-8100 amp's pre-power amp input
The input labelled AUX and TAPE IN is - EXACTLY THE SAME ! Only switch between the source and actual input of an amp.
For the case of running either AUX or TAPE IN inputs I see no reason for yet another one unnecessary link in the chain - and that would be the tube amp. But if it gives you flavor you like better than without it - hey, it is your system and your ears should be the judge. But absolutely necessary it is, under any circumstances, not.
If you run the DAC>tube amp>power amp in - basically the same thing, unless your DAC has no provision for the volume control - in that case, some form of volume control is required, in this case provided by the tube amp.
Your ears should be the final arbiter - enjoy the journey !
Edited by analogsurviver - Today at 12:20 am