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Partridge Output Transformer KT66 PX25 Valve Amplifier Leak BTH Dynatron Tannoy
Tannoy 2 views

Partridge Output Transformer KT66 PX25 Valve Amplifier Leak BTH Dynatron Tannoy

USD$939 GBP$699
Location
GB
Seller
the-joy-of-music
Source
eBay UK
Posted
24 May 2026
Last seen
6d ago

RADAR is a price search engine. We link to the original listing — we never sell direct. Transactions happen on the source site.

Our Thoughts RADAR AI

Condition is unknown, so at £750 this sits above the £732 75th percentile and reads as ambitious against your recent UK comparables; it is not a bargain-price listing on the numbers alone. With the median at £237 and the 25th percentile at £91, this asks for a premium that only really makes sense if the transformer, chassis, and internals are unusually complete, original, and tested.

That said, this is the kind of item audiophiles chase for its output-transformer pedigree and the potential to anchor a serious DIY or restoration project, especially if the iron is the right Partridge/KT66-era type and the circuit is broadly intact. The upside is in originality and completeness: clear photos of the transformer stamps, valve lineup, underside wiring, and any evidence of hum, overheating, or prior modification will matter more than cosmetics here.

Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.

About Tannoy

Tannoy traces its origins to 1926 in London, where Yorkshire-born engineer Guy R. Fountain established the Tulsemere Manufacturing Company in a modest garage. Initially focused on battery chargers and rectifiers for early radio sets, the brand name Tannoy emerged in 1928 as a contraction of "tantalum alloy," the key materials in its innovative electrolytic rectifiers. This British pioneer quickly pivoted to loudspeakers, cementing a heritage of audio innovation that spans nearly a century, including a relocation to Coatbridge, Scotland, in the 1970s.

The company specializes in loudspeakers, renowned for its revolutionary Dual Concentric driver introduced in 1947 at the London Radio Show, which transformed studio monitoring and home audio. Tannoy's portfolio centers on high-quality speakers—ranging from bookshelf and floorstanding models to the iconic Prestige series—alongside public address systems. While historically versatile in professional sound, its modern emphasis remains on hi-fi stereo and home cinema speakers, leveraging decades of driver technology expertise rather than diversifying into amplifiers, turntables, DACs, headphones, or cables.

Tannoy holds a revered position as one of the world's oldest loudspeaker manufacturers, blending high-end prestige with vintage appeal for discerning collectors and audiophiles. Its studio-grade monitors and meticulously crafted cabinets, often produced by specialists like Poland's Diora, earn consistent praise from hi-fi critics for exceptional clarity and dynamics. Now under the Music Tribe group, Tannoy endures as a benchmark for authentic British sound reproduction, appealing to knowledgeable buyers seeking timeless performance over fleeting trends.

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