Ex professional audio equipment from New Zealand (Soundcraft NZ)
Great if you need a quick no-frills 50W audio power amplifier OR extract the SI-1050G hybrid i.c
50W Audio Amplifier Module (complete with PSU & auxiliary PCB)
Manufacturer: Soundcraft NZ
Model: MM106
Audio module maximum audio power output 50W RMS
Single channel
The Sanken hybrid i.c's have been around for years, extensively used in audio equipment since around 1974
This particular module dates from the mid 1980's
Full specifications for this hybrid i.c are showing in one of the photographs - not particularly impressive but good for a "quickie" audio amp OR remove the SI-1050G for part replacement in other equipment (10 pins need to be desoldered)
I am offering exactly as pictured:
SI-1050G mounted on a PCB with various auxiliary components necessary for correct operation
Another PCB which has a very simple unregulated DC supply (single rail) for the SI-1050G AND one large electro (1000uF 50v) which is the audio output capacitor, NOT part of the power supply.
All interconnect wiring has been left in place, just supply around 32V AC @ 2A approximately, connect your speaker or output transformer to the brown/white wires (8 Ohm impedance) and connect the sound source or a preamp output to the remaining unshielded grey wires.
COSMETIC CONDITION:
Excellent condition all round
No signs of any stress to the SI-1050G
Heat transfer compound on the rear of the SI-1050G has been removed (makes for a messy package if I left it there) - it is vital to add a new layer of suitable heat transfer compound to the back on the IC before mounting it onto a heatsink!
TESTING:
This module has been designed by Soundcraft (NZ) to run with minimal supply rail conditions. While in-situ I measured the supply to the SI-1050G and it is only 42V DC and the electro capacitor for filtering is also only rated to 50V
Raw AC supply from the power transformer (not included) was 32V (under load)
According to the specifications the SI-1050G typically runs with a 60+V DC supply so this module has been substantially under-rated in its design, I can only assume for long equipment life (no stress = long life)
I powered up this audio module before dismantling the equipment.
As this is a power amplifier module, it is "looking" for around 700mV input signal minimum and 10V input signal absolute maximum. Low level signals such as a microphone, phono, tape machine will require a preamp BEFORE being fed into this power module.
No issues at all - using a high level input (CD player) I had good sold audio, nice and clean.
No hum, buzzes or other weird noises!
The minimum area needed to instal this module (2x PCB boards) is 130mm x 120mm x 80mm high (the main power amplifier board is normally mounted onto the rear of the equipment casing, the latter acting as a heatsink.
As this is a "bare module", NO AC TRANSFORMER IS OFFERED WITH THIS MODULE
Stored in sealed plastic packaging and it will be supplied sealed
