Just looking at a value standpoint and the Era(80's & 90's) of the Adcom pre that you are looking at... The entry level quality audiophile companies at that time were PS AUDIO, Adcom, B&K, Sumo, Parasound, Hafler...
Of these companies, in Pre's only,
PS AUDIO... 4.6, 6.0, 6.1, 6.2 (had a 4.6 and 6.2)
Sumo Athena
B&K Pro 10MC - others that had model 10's or Sonata was best
Parasound PLD-1100 (did not own)
Adcom GFP565 II (had 555)
Hafler 915..IRIS (I had a 110)
I have owned most of these, for me, the Sumo and the B&K stood heads & heals above the others. After that, I'd take the Parasound, then the Adcom, then the Hafler.
Its only an opinion, but its the only one I've got.
Of these companies, in Pre's only,
PS AUDIO... 4.6, 6.0, 6.1, 6.2 (had a 4.6 and 6.2)
Sumo Athena
B&K Pro 10MC - others that had model 10's or Sonata was best
Parasound PLD-1100 (did not own)
Adcom GFP565 II (had 555)
Hafler 915..IRIS (I had a 110)
I have owned most of these, for me, the Sumo and the B&K stood heads & heals above the others. After that, I'd take the Parasound, then the Adcom, then the Hafler.
Its only an opinion, but its the only one I've got.