Proton 900

Name: Proton 900
Brand: Proton

Average price

$154

Market sales

Price trend

Insufficient trend data

$65Avg $154$250

Typical range $150 – $250 · middle 50% of transactions

Based on 4 market transactions via web search — not HiFi Registry sales. HiFi Registry sales will accumulate as new listings sell on HiFi Registry.

Sold or Listed Prices

Date	Sold or Listed for
Feb 21, 2021	$65
Mar 10, 2015	$150
Dec 9, 2014	$150
Apr 22, 2014	$250

4 market transactions via web search — not HiFi Registry sales.

Understanding the market

Half of recorded transactions fall between $150 and $250. The full range runs 3.8× from lowest to highest, which is normal for used equipment where condition, included accessories, and service history vary between units.

What buyers should know

Check whether the unit uses tubes or solid-state gain, and if tubes, when they were last replaced. Confirm all inputs switch cleanly and the volume control is free of channel imbalance at low levels, which is the most common wear point.

This range reflects 4 recorded sales, compiled from publicly listed and completed sales elsewhere on the used market, not from HiFi Registry transactions. Few units of this model reach the open market, which is itself useful to know: thin trading means published prices move further on any single transaction, and it usually means less negotiating room when one does appear. Treat this as an indication of where the model trades rather than a settled valuation.