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....the first name in High Fidelity since 1934

• Company History and Product Backgrounds

Some fantastic pictures of a visit to the Leak factory taken in 1968. A must see!! Some company history, and development of the first "Point One" amplifier - the "Type 15". Timeline for H.J.Leak, and some company collaborators. Leak at the New York Audio Fair, 1949 to 1953 Promotional Photo of H.J.Leak in Australia. Product summary of Leak amplifiers, tuners, pick-ups and loudspeakers. Retail Prices from 1956 and 1958 catalogues

• LEAK TL/12 Amplifier
  50'th Anniversary

In December 1998 it was the 50'th anniversary of the Leak TL/12 audio amplifier. To commemorate this occasion, a special collection of information relating to the TL/12 was created.

Visit the TL/12 50'th anniversary web page:

• Introduction
• Background
• Features
• Circuit
• Restoring the TL/12New photos added
• "Point One" 1951 Booklet (28 pages - a "must see")
• Production Variations
• What Did a TL/12 Cost?
• Reviews
  

• LEAK Power Amplifiers

TL/12 "Point One" power amplifier BBC Variations to the TL/12 TL/10 power amplifier TL/25A power Amplifier - not the better known "TL/25 Plus" TL/12 Plus power amplifier TL/25 Plus power amplifier TL/50 Plus (in gold and also grey ) Stereo 20 power amplifier Stereo 50 power amplifier Stereo 60 power amplifier (with comparison to the "Stereo 50")

• Leak Pre-Amplifiers

RC/PA and RC/PA/U Pre Amplifiers The Point One pre-amplifier The "Varislope" Pre-Amplifier Series The original Vari-Slope, including 1952 sales brochure information. Varislope II Varislope Stereo- now with the rare gold pre-amp facsica.

• Leak Circuit Diagrams and Restoration

Circuit Diagrams - original Leak circuits from service information sheets. A modified Stereo 50 with low gain (0.5V for full output) Restoring the Stereo 20 Amplifier (an external link - thanks to Colin Gray of South Africa) Restoring the TL/12 Output and Power Transformer Parameters and Measurements Leak Type 8615 Output Transformer winding arrangement Standees Resistors Parts Suppliers

• Leak AM and FM Tuners

The "VS-Radio-Tuner" for AM reception The original Leak "Trough Line" FM tuner - including how it was named. Leak Trough-Line II FM Tuner, A stereo decoder for the Trough-Line Tuner using the LM1800 decoder IC. A stereo decoder using the National Semiconductor LM1870 decoder IC. A note regarding correct de-emphasis time constants for the "Trough-Line Stereo" FM tuner. Leak Trough Line 3, and Trough Line Stereo Some alignment information for the Trough-Line.

• Leak Loudspeakers
  • The Leak "550" two-way moving coil loudspeaker
  • The Leak prototype Ribbon Loudspeaker
  • The Leak prototype Electrostatic Loudspeaker
  • Sandwich Loudspeaker - introduced around 1960 featuring advanced cone technology.
  • Modifications to the Sandwich MkII crossover that will dramatically update performance

    (PDF file; Reproduced by Permission from the Melbourne Audio News).
    
    

• Leak Curiosties and References

Distortion from Leak driver stages - 6SN7 and ECC83 types investigated Leak 12AT7 versus 6CG7. Some less well-known Leak curiosties: The "VS-Tuner", Leak Cabinet Console, Leak TL/12 Public Address Set. Twin TL/50 Plus - the original Leak circuit custom-built as a stereo pair References to Leak products, or articles etc. in the technical press Some spot-prices seen for Leak equipment.

• Leak WWW Resources
  
  
  • "firsts in High Fidelity"
    Now Available: A fabulous book comprising the definitive and authentic history of H. J. Leak & Co. Ltd.
    270 pages, 300 illustrations, 30 circuit diagrams, softbound. ISBN 1-882580-31-1
    Available from:
     -- Audio Amateur Corporation, USA  --  Evatco, Australia -- StoneAudio, UK
    
    
    

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