Leak

Harold Leak's Point One amplifier proved British audio could lead the world

History

H.J. Leak & Co. Ltd. was founded in London, England in 1934 by Harold Joseph Leak. The company began as a manufacturer of public address equipment before the war, but it was in the post-war era that Leak would establish itself as a major force in high-fidelity audio.

In December 1948, Leak introduced the TL/12 amplifier—a design that would secure the company's future as a dominant player in the burgeoning hi-fi market. The "TL" stood for "Triple Loop," referring to the 26dB of negative feedback that included three gain stages plus the output transformer. The TL/12 delivered high performance at an accessible price point, making quality audio available to a wider audience.

The TL/12's success was followed by the Stereo 20 (1958) and Stereo 30 (1960), which brought Leak's reliable, musical sound to the emerging stereo market. These amplifiers featured point-to-point wiring, quality transformers, and conservative ratings that ensured long, reliable service.

In January 1969, Harold Leak sold the company to the Rank Organisation. Production continued, but the company's fortunes gradually declined. The original Leak factory closed in the late 1970s, though the brand has seen several revivals under different ownership.

Legendary Products

Leak TL/12 "Point One" (1948)

The amplifier that established Leak's reputation. Named for its 0.1% distortion at rated power—a remarkable achievement for 1948. The TL/12's three-stage design with triple-loop feedback became the template for British valve amplifiers.

Leak Stereo 20 (1958)

A 10-watt stereo amplifier that became legendary for its musicality. Using EL84 output tubes, the Stereo 20 delivered sweet, engaging sound that made it a favorite among British audiophiles and a sought-after vintage amp today.

Leak Stereo 30 / TL/30 Plus (1960s)

The Stereo 30 offered more power (15 watts per channel) using EL34 tubes. The "Plus" version added improvements to the circuit and power supply, making it the ultimate expression of Leak's valve amplifier philosophy.

Leak Sandwich Speakers (1960s)

Leak's innovative speaker line using the "Sandwich" cone technology—an aluminum/polystyrene/aluminum laminate that offered excellent rigidity and damping. The Leak Sandwich 200 and 250 were highly regarded.

Sound Signature

Leak amplifiers are characterized by:

• Musical warmth - Engaging, organic presentation
• Reliable performance - Conservative design lasts decades
• Transformer quality - Excellent iron, minimal distortion
• British reserve - Refined, never aggressive
• Tube sweetness - EL84/EL34 magic

Collecting Leak

Vintage Leak gear is valued for:

• British heritage - Classic UK tube sound
• TL/12 historic significance - Influential design
• Stereo 20 cult status - Highly sought after
• Build quality - Point-to-point craftsmanship
• Serviceability - Simple, well-documented circuits

Restoration Tips

Common Leak service items:

• Replace paper and electrolytic capacitors
• Check output transformers (high quality, rarely fail)
• Verify tube bias settings
• Clean chassis and controls
• Replace selenium rectifier with silicon

All Models in Archive (28)

Amplifiers

• Leak - British Amplifier Excellence

Amplifiers

• 2060 - 1958
• POINT-ONE-PLUS - 1972
• POINT-ONE-STEREO - 1957
• RC/PA - 1952
• RC/PA/U - 1955
• STEREO-20 - 1959
• STEREO-30 - 1963
• STEREO-30-PLUS - 1972
• STEREO-50 - 1959
• STEREO-60 - 1959
• STEREO-70 - 1957
• TL/10 - 1959
• TL/12 - 1959
• TL/25-PLUS - 1965
• TROUGH-LINE - 1958
• TROUGH-LINE-3 - 1957
• TYPE-15 - 1955

Equalizers

• VARISLOPE - 1956
• VARISLOPE-2-STEREO - 1959

Speakers

• Moving-Coil Pickup and Arm - 1954
• POINT-ONE - 1945
• SANDWICH - 1953
• STEREO-PICKUP - 1959
• TROUGH-LINE-STEREO - 1958
• VARISLOPE-II - 1955
• VARISLOPE-III - 1958
• VARISLOPE-MONO - 1957
• VARISLOPE-STEREO - 1959