Leak Logo Stereo 20 Power Amplifier  

This amplifier is basically a stereo version of the TL/12 Plus, however the input stage differs in that it uses one half of a 12AX7 twin-triode in each channel instead of the EF86 -pentode used in the TL/12 Plus. In addition the driver stage is a 12AX7 instead of the lower-gain 12AT7 of the TL/12 Plus.

The amplifier is one of the most common Leak amplifiers on the second hand market, as 10 Watts per channel was considered adequate with the efficient speakers of the day. The amplifier sounds good, and doesn't become harsh when clipped. The power transformer runs very warm, and can leak wax out from the bottom if operated for long periods on hot days (above 30 Celcius ambient). The author knows of several amplifiers in which the power transfomer has failed (in Australian conditions).

The amplifer shown above has 4mm banana sockets instead of the original screw terminals for speaker connections.

Shown the the right is a final inspection tag fitted at the factory to a Leak Stereo 20 amplifier, dated 20 Oct 1964. At this time, the Stereo 20 was being shipped in dark metallic grey livery with cream lettering .

Acknowldegement: The photo of the inspection tag was kindly supplied by Graham Shore of the United Kingdom.


H. J. LEAK & CO. LTD.

Designers and Manufacturers of Specialised Electronic Instruments for the Communications Industries

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