Now, I'm confused.

All recordings are artificial and many (particularly multi-tracked rock and rap) are far from the "sound of musicians playing in a room"! What many prize in a stereo system as "soundstage" is often an illusion caused by wall and floor reflections! 

Anybody remember the AudioPulse reverberation device? It allowed one to dial in various settings: "small club" all the way up to "cathedral"! It contained a two-channel amp to be connected to a pair of speakers behind the listener. And it gave surprisingly good results when used judiciously! This was back in the mid-70's before HT. 

The soundstage consists of width and depth. That's why room treatments are being recommended. Using absorbtion and/or diffusion panels will help shape the soundstage and focus the image.

Regarding a preamp, the Schiit Freya may be worth an audition due to the use of the 6SN7 tube, plus a return policy.

Audio Pukse Model One time delay. And the Audio Pulse Model Two, which had three sets of delayed Stereo channels that required separate amps for each set. That’s the one I had. 

dude !!!!!
pretty sure my Dad had a 1965 Dual 1019
with a V15 Type II

and i am not knocking it...

i think you have been given excellent advice to download tge model 2 manual for free and rigorous setup by the book. I assume you have tge Soundanchor stands ?

after you get that squared away ( not literally ) then perhaps consider some of the gear listed above.....

as some have said without knowing what cartridge you are running in the German semiautomic stacker, I would advise a preamp change...

we were one of the biggest NAD dealers in America, I know the...he&& still have a 3020 a in the garage....