Marantz 1060 - Introduction; Introduction to Service Manual; Amplifier Block Descriptions; Pre-Amplifier Section

1. INTRODUCTION
This service manual was prepared for use by Authorized Warranty Stations and contains
service information for Marantz Model 1060 Stereo Console Amplifier.
Servicing information and voltage data included in this manual are intended for use by the
knowledgeable and experienced technician only. All instruction should be read carefully. No
attempt should be made to proceed without a good understanding of the operation in the
circuits.
The part lists furnish information by which replacement part may be ordered from the
Marantz Company. A simple description is included for parts which can be usually be obtained
through loca! suppliers.
2. PRE-AMPLIFIER
Signals from the input jacks (TUNER, TAPE, AUX & AUX 2) are applied to the selector
switch.
Signals from the PHONO or M!C/AUX 2 jacks are applied to the other section of the selector
switch, then, led to the phono-amplifier and equalized to match the RIAA curve for flat
frequency response. The gain of the phono-amplifier consisting of H901, H903 and H905 is 40
dB.
The outputs of the phono-amplifier are led to the selector switch. The selector switch selects
one of signals from PHONO, MIC, TUNER, TAPE, AUX or AUX 2 jacks and send it to the TAPE
MONITOR switch and TAPE OUT jacks. The selected signal is then applied to the balance and
volume controls, then, to the pre-amplifier consisting of H401 H403, H405 and H407 through
Mono switches.
The frequency response is varied by the Bass, Middle and Treble controls and the resultant
output are led to PRE OUT jacks through High-cut and Low-cut filter networks. These networks
are switched in and out from the circuit by the push-switches.
3. MAIN AMPLIFIER
Transistor H701 is a pre-driver coupled to the transistor H703 through capacitor C711. The
Transistor H703 drives the inverter transistors H709 and H711 which, in turn, drive the power
stage consisting of HOO1 and HOO2. Transistors H705 and H707 are current limiter operating as a
power protection circuits.
Excessive currents flowing into the power stage are detected by the resistors R741 and R745
and the resultant variations are applied to the transistors H705 and H707 and make them turned
on. This decreases the current flowing into the H709 and H711., In this way the currents flowing
in the power stage (HOO1 and HOO2) are restricted within a safe value.
4. POWER SUPPLY UNIT
This power supply unit consisting of.a transistor H801, which operates as a lippie filter,
provides +35V DC to the phono-amplifier and +27V DC to the pre-amplifier (Tone A.mplifier).