MOM, here is a video (not mine) demonstrating the awesome tuner.
https://www.youtube.com/watch?v=h6XEtdJ0X9g
Here is a screen capture of one from the net (not mine). The equalizer above it is pretty much standard audio equipment size which generally is approx 19" wide. When you get a piece of audio gear, this equalizer is about the size one normally imagines. Of course what you can't see is the depth, which is very very deep.
Here is a photo of the backlid off. That huge can in the middle is a massive toroidal transformer. If you want to know more about that type design and why they are better, google it. They are also far more expensive than normal transformers, and this one is unique to Pioneer as they almost surely custom spec'd it for this application, it's also why it's so heavy. The 4 cans you see orbiting the large transformer are the storage capacitors. Yup, huge beer can size muthas. The look is such that when these units are rebuilt, the most particular and discriminating technician will actually carefully remove and saw apart the capacitor to retain that shell so it can be "re-stuffed" and retain the original look. Although time consuming, it is made possible today because similar valued capacitors today (due to better and different manufacturing techniques) are usually a little smaller. It's also common to stuff capacitor arrays inside to arrive at the original capacitance value. The 2 boards on either side of the power supply are the power amplifiers and each has it's own beefy heatsink open to the outside without screen shrouding.
As for weight, today, it certainly is a behemoth. I can't lift it unless my wife helps me. Of course when I bought mine 35 years ago, it never occurred to me as being heavy, but then I was a lot stronger back then. It's not a boombox so you don't carry it around with you. It's a fixture. Think of your refrigerator... you don't think about how heavy that thing is right? No, you set it in place, once, then never worry about it again. It should be the centerpiece of your entertainment system. As for power, I truly cannot fathom operating that beast cranked to max, not even for 1 second. That's because at 1/4 volume, the house is already shaking. At 1/3 volume, serious concern begins to develop in your brain about whether or not your $3,000 pair of speakers are going survive much longer. When you feel this aweeeesome power, you wonder whether those claims of 1000 watts or 2500 watts type of audio are lying. Ok, you KNOW they are lying but you then wonder how they can look themselves in the face and advertise it with a straight face, right?