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Year of manufacture: 1948 - 1955
Manufactured by: H. J. Leak & Co., Ltd Brunel Road, Westway Factory Estate, London W3
Price when new (in the UK): £18 18s. In the USA, $153.70 for the TL/12 only and $192 including the preamplifier (1951 Allied Radio)
Description: power amplifier
Mono/stereo: mono
Power output: 12 watts RMS maximum
Total harmonic distortion: 0.1% at 10 Watts output (± 1dB) at 1,000 c/s
Frequency response: ±0.5dB 20-20,000 c/s
Loudspeaker impedances: any impedance between 3 and 20- output transformer adjustable for 16, 8 & 4
Hum and noise: 82 Db, ± 3dB, below 12 watts with a source impedance of 25K
Input sensitivity: an input of 125mV at 1,000 c/s gives 12 watts output
Input impedance: 1M, plus approximately 5 mmfd
Damping factor: 25, measured at 1,000 c/s
Tubes:
First stage:
EF86 (Z729 or 6267)
Second stage: ECC81 (B309 or 12AT7)
Output stage: Two EL84 (N707 or 6BQ5
Rectifier GZ34 (5V4 or 5AR4)
Stability margins: gain - 10dB ± 3dB; Phase - 20° ± 10°
Dimensions: 10 x 11 x 6 ins (254 x 200 x 152 mm)
Weight: 14.5 lbs (6.58 kg)
Power supply: 200 - 250 Volts AC 50-100 c/s; consumption 75 watts (80 watts with Leak preamplifier attached)