Threshold

Explore Threshold vintage audio equipment in the Vintage Technology Archive.

Power Amplifier

• S-200 — Threshold S-200 Stasis power amp — thin documentation, but dealer classifieds track used prices from $1,395 in 1990 to $995 in 1993.
• S-500 — Threshold S-500 power amplifier: 250W/ch into 8 ohms, Stasis topology, later optical bias control, pure Class A to ~50W. Thin period record.

Power Amplifiers

• S-300 — Little is documented about the Threshold S-300; period S-series coverage exists, but the S-300 itself is not identified.
• T-800D — Little-documented fully balanced Threshold T-800D power amplifier, $5,495 in 1998; measured flat output impedance by Audio (Nov 1997).

Preamplifiers

• NS-10 (1978) — Threshold NS-10 (1978) — Nelson Pass's first Threshold preamp. Class A discrete, 50 MHz bandwidth, two MM phono inputs. Rare, serviceable, collectible.

Other Models

• FET-10 — Threshold FET-10 preamp: Nelson Pass design, $3,550 with phono in 1988, two variants (PC/HL), factory update program. Collector notes.