Yamaha R-50 receiver failed

Our faithful, 20 year-old Yamaha R-50 recently failed to power on.
After checking things like the power cord and outlet, I carefully
removed the cover and found a blown slow-blow fuse close to the the
power transformer. I replaced this 250v 4a fuse and now the receiver
will power up (lights on the console are lit). However, I am still
getting no output to either the speakers or headphones, from either the
radio or aux (CD) sources. Is there anything else that a careful novice
like me can try or check, or is our receiver a lost cause?

Many thanks for any suggestions,
Greg

.

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