|MARK LEVINSON No27L
Stereo power amplifier developed based on the
know-how acquired in the development it1 of No23L.
The dual monophonic
stream composition which separated right and left from the power transformer
completely is adopted.
Two toroidal transformers and a total 45,000micro F
capacitor are thrown into a power-source part, and also power is supplied to the
power transistor by the shortest distance by the bus bar of oxygen free high
The voltage amplification stage was considered as
the 2 steps of transistor differential-amplifier stream composition by which
cascade connection was carried out, and the stabilized power source of a
discrete is used for it. Moreover, the current amplification stage has
three-step Darlington SEPP composition.
A circuitry required as power
amplifier is studied from a viewpoint original with Mark Levinson, and the input
impedance which is constant 50 kohms and is not changed over all the bands,
internal-impedance-ization of the output stage low enough, etc. are performed.
As a measure against a noise, pi type high cut-off filter and the
capacitor for DC cut are inserted in an input terminal, and the line filter is
inserted in AC line.
The protection circuitry of the school rule
operation which protects the surge limiter circuit which protects the component
partses of a power-source part from the large current at the time of power
activation, the output stage of amplifier, and a speaker unit from a corruption
In addition to the general entry by a CAMAC connector, the balance input
by a canon type connector is carried.
The using as high power
monophonic amplifier is possible by bridge connection.
||Stereo power amplifier
||Dual monophonic stream composition
700W (at the time of 4 ohms and bridge connection)
400W (at the time of 8 ohms and bridge connection)
||4Hz - -140kHz three dB
||175W (at the time of an idling)
the time of 8 ohms and an Output power)
||Width 483x height 175x depth of 450mm