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DIY KT120 Mono Amplifiers 2 x KT120 tube monoblock single-ended, ultralinear amplifiers - Tung Sol KT120 output tube, 5AR4 rectifier, and 6EJ7 driver. Thermionic Labs custom transformers. Point to point wiring, top quality parts. Assembled using 5mm alloy plate and kwila hardwood and best construction methods approx 15 months ago. These sound superb - amazing dynamics and soundstage - and I'm only selling because I have constructed a 300B amp, which I'm hoping will sound even better than the monoblocks after break-in. There is NO noise or hum from the monoblocks - music emanates from an inky
Are you paying for a bargain set of DIY valve monos, or for a project with real-world risk? At AUD 3,500, this sits well above the typical used comparable median of AUD 624 and even the 75th percentile of AUD 963, so by the numbers it’s an ambitious ask rather than a fair-market buy.
That said, properly built KT120 monoblocks can be very compelling: big, effortless dynamics, strong bass control for valves, and a presentation that can make efficient speakers sound larger and more alive. The upside is in build quality and parts choice, so I’d want clear photos, a full parts list, proof of safe construction, and confirmation it’s quiet and stable under load. At this price, provenance and execution matter a lot.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Tung-Sol emerged as an American electronics manufacturer founded in 1904 by Harvey Wilson Harper and brothers Herbert E. and Herbert C. Plass in New York City. The company's name derives from "tungsten" and the Latin word "sol," reflecting its early focus on incandescent lamp technology. Beginning with automotive headlights and Christmas tree lights, Tung-Sol expanded into radio and vacuum tube production throughout the early twentieth century, establishing itself as a serious player in American electronics manufacturing before relocating to Newark, New Jersey in 1917.
Within the audio industry, Tung-Sol's legacy rests almost entirely on vacuum tubes rather than complete amplifiers or speakers. The company's most significant contribution to hi-fi was the 6550 power tube, conceived and introduced in 1955 specifically for high-fidelity applications. This tube remains in production and continues powering premium audio systems decades later. Tung-Sol also manufactured other critical audio tubes including the 6SN7GTB, which audiophiles still seek for tube rolling and system optimization.
Tung-Sol occupies a unique position in the hi-fi market as a vintage-collector and niche boutique brand. The company's original American-made tubes from the mid-twentieth century command premium prices among discerning audiophiles who value their sonic characteristics and build quality. Modern Tung-Sol tubes are manufactured under license in Russia, creating a distinct market segment where vintage American examples are prized by tube enthusiasts, while contemporary production serves budget-conscious buyers seeking the brand's heritage at lower price points.
See all Tung-Sol listings on RADAR.
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