These tubes are shot replace ASAP you will hear more detail,more dynamics etc.
When To Re-tube ARC REF?
What are the first audible signs of tubes that need to be replaced? I have a pair of ARC REF 210s that have had the factory mod to run KT120 tubes, which now have 2375 hours since I put them in. The hours suggest replacement, but I'm not hearing that yet, or so I believe. How would the sound first change? Thanks.