Nice little preamp. VERY simple to get to the pots for cleaning. In fact, I don't think I have ever worked on an easier to service piece of equipment. The pushbuttons, pots and bulbs are all extremely easy to get to. In 1977 the last of these went for $450 which in todays dollars equals a little over $1700. These don't get a lot of love from the audiophile community, but that's because after decades, vintage equipment can get out of spec. Capacitors go bad. I believe that I'm just lucky to find one that's in great shape. The guy who sold it to me said it was restored. I think it sounds great. Check out the split pic of the back and front below.