C
IRCUIT DESIGN
The MV60 circuit is notable for its elegant simplicity. A triode input
amplifier comprised of paralleled sections of a 12AX7A 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 of a pair of EL34s,
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 reactive speaker loads. A substantial main power supply of massive
polypropylene capacitors enables the MV60 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.
Optionally, the MV60 may be reconnected internally for triode operation
of the output stage, for exceptionally musical performance, but at con-
siderably reduced output power. The conversion is simple, but does
require soldering. Consult your dealer as to which configuration will
perform best in your system.
MV60 Owner’s Manual 4
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