The Beomaster 8000 preamplifier board is the next board I restored. The tasks are similar to the Filter & Tone Control board. The electrolytic capacitors will be replaced, the LF353N opamps will be updated with new ones. Board connector solder joints will be reflowed. The board is cleaned and the input source level trimmers are cleaned.
Here is the preamplifier board prior to restoration.
This is the board where the components to be replaced have been removed. I will clean the board with alcohol and the trimmers cleaned with Deoxit.
This is the board with new capacitors and opamp sockets.
Finally, the completed board.
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