Pioneer M-25 Amplifier

Ok just got this amp the Pioneer M-25 Has anyone own one .. does anyone have spec on it . Like to know what mates well with it a Solid State preamp / or would a tube pre be better .. like to hear the inputs and the views of others ,,
I have lots of experience with this amplifier and the M-22 and A-27 (M-25 with a built in pre-amp). I like to mate classic ss amps with exceptional vintage ss preamps (Klyne or Motif or other out-of-the-way designs) but I really prefer a tube pre in front of this classic amp. Example: CJ Premier 10.

Surprisingly, the A-27 integrated is less grainy than a M-25 and C-21 preamp.