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Stereo Amplifier 7W

Stereo Amplifier 7W; Mullard Wireless, (ID = 2014232) Ampl/Mixer
Stereo Amplifier 7W; Mullard Wireless, (ID = 2014233) Ampl/Mixer
Stereo Amplifier 7W; Mullard Wireless, (ID = 2014231) Ampl/Mixer
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Stereo Amplifier 7W; Mullard Wireless, (ID = 2014231) Ampl/Mixer
Mullard Wireless,: Stereo Amplifier 7W [Ampl/Mixer] ID = 2014231 1024x656
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For model Stereo Amplifier 7W, Mullard Wireless, London (see also Mullard Radio Valve):
From manufacturers litrature
Country:  Great Britain (UK)
Manufacturer / Brand:  Mullard Wireless, London (see also Mullard Radio Valve)
Year: 1958 Category: Audio Amplifier or -mixer
Valves / Tubes 6: ECC83 ECL82 ECL82 ECL82 ECL82 EZ81
Main principle Audio-Amplification
Wave bands - without
Power type and voltage Alternating Current supply (AC) / 200-250 Volt
Loudspeaker - This model requires external speaker(s).
Power out 14 W (undistorted)
from Model: Stereo Amplifier 7W - Mullard Wireless, London see
Material Metal case, TUBES VISIBLE
Shape Chassis only or for «building in»

The circuit diagram drawn in Fig. 1 is for a high-quality, dual-channel amplifier designed principally for stereophonic reproduction but also providing facilities for monaural applications. Only one channel of the amplifier is drawn. The circuitry appearing between the dotted lines is for the left-hand channel: it should be duplicated for the right-hand channel. The circuitry drawn outside the dotted lines (the power supply, for example) is common to both channels.

The total complement of valves used in the amplifier consists of one double triode, type ECC83, four triode pentodes, type ECL82, and one full-wave rectifier, type EZ81. The double triode is shared between the two channels, one section of the valve being used in each channel for voltage amplification. Two of the ECL82 are used in each channel. The triode sections of these valves form a phase-splitting stage and the pentode sections are arranged as a push-pull output stage with distributed loading. The EZ81 forms a conventional power supply with resistance-capacitance smoothing, providing the h.t. for both channels.

The rated output-power reserve of each channel is 7W, at which level the total harmonic distortion is always better than 1.0 %. The low level of distortion is achieved by using 21dB of negative feedback, the feedback voltage being taken from the secondary winding of the output transformer in each channel to the cathode circuit of the corresponding input stage. The sensitivity of the circuit, even with this high value of feedback, is 120mV, which is ample for use with existing stereophonic crystal pick-up heads.

Mentioned in - - Manufacturers Literature

Model page created by Gary Cowans. See "Data change" for further contributors.

All listed radios etc. from Mullard Wireless, London (see also Mullard Radio Valve)
Here you find 139 models, 107 with images and 57 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.