Yamaha (Hi-Fi) · B-series separate power amplifiers

B-1

The legendary V-FET power unit - Yamaha's vertical field-effect output devices and 150 W/ch in a 37 kg chassis.

Catalogue code: B-1
Years: 1974
Type: power amplifier (V-FET)
Valves & speakers: 150 W + 150 W into 8 ohms, V-FET output stage
Lifecycle: retired
Confidence: High

Specifications

Watts: 150
Watts_basis: per channel, 8 ohm load unless noted in rated_load
Channels: 2
Technology: solid-state
Class_of_operation: not stated in the catalogue sheet
Tubes: V-FET (2SJ18/2SK60)
Weight: 37 kg

Safety

Mains-powered vintage Yamaha: the V-FET devices in the B-1/B-2 are long out of production and fail if the bias drifts, so never run an unrestored unit hard. Japanese-market units are 100 V - use a step-down transformer.

01 / Witnesses

What applies here

Marks that can be entered for this maker: Model / catalogue number, Model / catalogue number, British capacitor code (Hunts, Mullard), Japanese capacitor code (Nichicon, Chemi-Con, ELNA), EIA component code, Version & era marker.

02 / Bounds

The model year is a floor

Nothing predates 1974; components only push the date later.

03 / Value

What moves the price

Sold-listing reading: fair EUR 399, good EUR 399, excellent EUR 399 EUR · 1 sold listings (thin sample — indicative only) · as of 2026-10-17. Asking prices only - these are live listings, not completed sales. 1 listing(s) in EUR observed on 2026-10-17 via the HiFi Shark marketplace aggregator; with fewer than three observations the same min/median/max is recorded as an estimate, not as an asking aggregate, which is a reading of the ask spread, not a condition grading.