When did it last sound good? Any changes since then or just time? If just age, I'm not an expert on your components but age of your equipment/cables (other than pre-amp) could impact sound, for example, Bryston - capacitors, bias, etc may need a servicing. If you liked the system at some point, why not buy the same cables (new old stock or their current replacements) if you can find them - try this in sequence - replace the phono preamp to preamp, pre-amp to amp, speaker cables to see if it makes any step in the sequence improves the sound. Good luck.

