I've seen that receiver on ebay a few times but I don't recall if it's tubes, SS or hybrid (both). If it isn't too far away it may be worth your while to go look at it and if the owner still has the paperwork, take a look at the schematics or see if they'll let you remove the back and take a look. If you can get the model # for the tuner/pre or receiver, which ever it is, someone here can probably give you more info. I could only make out Pilot from the photo but not the model#.
Good luck!