To paraphrase from the service manual.
The HLD-X0 has 37 active power regulators spread around its different PCBs, most of these are not the standard IC type but made from several individual components which has much lower impedance variations than the IC type. The HLD-X0 has in its NTSC path five NTSC decoders (from RF) in parallel to average out any decoding errors, it has enough memory to run NT, uses 9 bit digital processing, uses the best selection of 1702 audio DACs and so on. Its a real beast.