|Leak TL 12 mono power amplifier|
REPORT ON TESTS OF TWELVE WATT AMPLIFIER Marked: "POINT ONE" TL/12, H. J. LEAK & CO. LTD.
In all cases the input was applied to a 50,000 ohm resistor connected to the amplifier by 3 feet of screened cable. The output load was in all cases a resistor of 18 ohms, and the output transformer secondary windings were connected for the " 15 ohms-20 ohms" condition.
TOTAL HARMONIC DISTORTION for 10 WATTS OUTPUT.
0.037 at 1,000 c/s, (0.0003 ratio to fundamental).
HUM AND NOISE.
-80db referred to 10 watts.
148mV r.m.s. input gave 12 watts output at 1,000 c/s.
LOAD DAMPING FACTOR. (Load impedance/output impedance).
42 for 10 watts output at 1,000 c/s. (Output impedance
Gain relative to that at 1,000 c/s measured at 7.5 watts output, including the losses introduced at the higher frequencies by the capacitance of the input resistance of 50,000 Ohms.