RADAR is a price search engine. We link to the original listing — we never sell direct. Transactions happen on the source site.
Offered is „1 Paar SA 11M mit schaltbarer Stromsparschaltung von Ralf Kassel“ by Threshold as second-hand device from the category „Transistor-Poweramp“ on audio-markt.de - the online market place for high-end. The advert with the number 5123730055 ends on 07.11.2026 at 06:37 o'clock.
What matters most to you here: paying up for a respected Threshold amp, or waiting for a cleaner bargain? At €6,800, this sits well above your database median of €3,040 and even above the €3,850 upper quartile, so it reads as ambitious rather than fair.
That said, Threshold’s big Class A/current-capable power amps have a strong reputation for grip, drive, and a very authoritative, effortless sound, so the appeal is real if you want that presentation and the unit is genuinely well kept. The listing’s “good” condition and the Ralf Kassel modification may add interest, but at this level I’d want clear service history, matching channels, and proof that the mod was done cleanly before treating it as a buy.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Threshold Audio emerged in Sacramento, California, in 1974, founded by renowned audio engineer Nelson Pass alongside graphic designer René Besne and Joe Sammut. Pass, a pioneer in amplifier design, launched the brand with the groundbreaking Threshold 800A power amplifier in 1975, introducing a novel sliding bias system that boosted Class A efficiency while employing 48 output transistors in a sophisticated triple-series/triple-parallel configuration. This California-rooted heritage defined Threshold as an innovator during its original run, which spanned until the mid-1990s, after which the intellectual property changed hands, including a 1994 acquisition by investor Randy Patton, who integrated it with PS Audio and relocated operations to Camarillo.
The brand focused squarely on high-end amplification, producing iconic power amplifiers like the 400A and 800A, the Stasis series renowned for their balanced Class A performance, and preamplifiers such as the NS10, SL10, and FET range including the FET-1, FET-2, FET-9, and FET-10. Later designs, like the T-200 by engineer Michael Bladelius, continued this legacy. Threshold eschewed speakers, turntables, DACs, headphones, or cables, concentrating instead on pure analog amplification that prioritized sonic purity and robustness.
Threshold holds a revered position as a vintage high-end icon, cherished by collectors and audiophiles for its enduring sound quality and Pass's technical wizardry. Once a market leader in premium solid-state gear from 1975 to 1992, it remains a sought-after name in the used market, embodying boutique excellence rather than mass production, with modern revivals under Threshold Audio sustaining its elite reputation.
See all Threshold listings on RADAR.
