UL1403P замена на TDA2030A в проигрывателе Арктур 006. Реанимируем Арктур 006.

The UL1403 chip is discontinued and hard to find. The video explains how to replace it with a TDA2030A in the Arktur 006 player. It references a 1988 Radio magazine article that provides the circuit and tuning method. The replacement board reduces motor power due to series resistors in the output transistor circuit. The new version is simpler and compact. The replacement works but requires removing capacitors to prevent self‑oscillation of wideband chips, which in the author’s case were oscillating at 2.5 MHz and overheating. The first attempt failed because of this. The article also details how to set the zero points by measuring voltage between pins 5 of the UL1403 and adjusting resistors R35 and R33 to zero volts at millivolt sensitivity.