Vermes
Advanced Member level 4
It is a processing of an old Eltron amplifier. Described here device uses some elements of that amplifier, including housing. Adding two original transformers allows you to convert the device into stereo. Then you have to add another power supply on metal diodes (5A) and capacitors with a total capacitance of almost 50mF. Based on T302 (or T301) mixing degree and drive indicator were doubled. 3-4- channels were connected respectively 3 to the left channel, and 4 to the right channel. The amplifier is also equipped with a mono/stereo switch.
Then you can design a new power degree PCB of the amplifier. Degrees of mixer and first input were made on operational amplifiers NE55532 with gain adjustment in the feedback loop. The PCB of power supply was also re-made. It consists of 24V power supply for preamplifiers and 12V for control of expanded two-color backlight of the indicator and system of quiet turning on the amplifier.
Pictures:
Link to original thread - Eltron 100U na stereo