H.J. Leak & Co. · Leak valve era

TL/12 Point One

Harold Leak's breakthrough unit of 1948 - the design that made Leak a hi-fi name and a BBC standard in 1951.

Catalogue code: TL/12
Years: 1948–1956
Type: power amplifier (mono)
Valves & speakers: 12 W mono valve amplifier, KT66 push-pull with the "Point One" negative-feedback circuit
Lifecycle: retired
Confidence: Medium

Specifications

Watts: 12
Channels: 1
Technology: tube
Tubes: 2x KT66

Safety

UK valve chassis: mains-derived HT rails stay charged after switch-off; original Hunts/TCC/Erie capacitors and the mains transformer are the two failure points. Value is set by untouched transformers and original cosmetics (silver/black livery), not by the valves fitted.

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, Chassis / platter stamp.

02 / Bounds

The model year is a floor

Nothing predates 1948; components only push the date later.

03 / Value

What moves the price

Sold-price aggregates are not collected yet, so the archive gives no figure — condition, originality of the transformers and a documented recap move this model more than any list price.