This is the SA‑8500II, the improved and updated version of the original SA‑8500. The II model features a revised amplifier design, lower noise floor, cleaner voicing, and better channel separation. It is not the same circuit as the earlier SA‑8500 — this is the more refined, more reliable version. Comes with a free Timer- The Pioneer DT-550
Recent Service (May 2026): All six small‑signal transistors in the flat amp/tone amp section were replaced with modern, low‑noise equivalents:
Replaced noisy/leaky originals (2SC945, 2SA733, 2SC869)
Installed modern KSA992F (PNP) and KSC1845F (NPN)
These are the correct low‑noise audio‑grade replacements
Channels now perfectly balanced and crystal clear
The DC offset is now remarkably low, indicating a perfectly balanced differential stage and extremely healthy amplifier:
Right Channel: 3.0 mV
Left Channel: 0.5 mV
Anything under ±20 mV is considered excellent — these numbers are exceptional for a vintage amplifier.
Both channels are now perfectly matched, crystal clear, and operating exactly as Pioneer intended. This SA‑8500II is fully serviced, stable, and ready to enjoy.
If you’re comparing the SA‑8500 vs SA‑8500II, this is the one you want — quieter, cleaner, and more stable.