CIRCUIT DESIGN
It has been our experience that simple designs with few active stages
when executed with care and great attention to detail will be both more
musical and more reliable than overcomplicated alternatives. Accord-
ingly, the audio circuit of the MV52 is remarkably straightforward. A
triode input amplifier comprised of paralleled sections of a 5751 is direct
coupled to a cathode coupled differential phase inverter using high
current triodes to provide balanced, low impedance drive to the push-
pull output stage. The output stage features ultralinear operation which
permits high power levels while greatly reducing the source impedance
of the stage. As a result, the amplifier is capable of supplying the large
current demands of high amplitude musical transients driven into reac-
tive speaker loads. A substantial main power supply of massive
polypropylene capacitors enables the MV52 to easily meet these ex-
traordinary current demands. Voltage regulators for the voltage amplifi-
ers and phase inverters provide nearly absolute isolation of these
sensitive stages from the output stages.
MV52 Owner’s Manual
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