Hi Keungyee,

I had been thinking along the same line and when I saw your post I asked Marc Koval and his response was at about 20 years or so it's time for a cap replacement in the PSU and AMP. Since my 6k's are late '93 to mid '94 vintage I'm going to have it done as soon as I figure out the logistics.

Ken

Main: G68J, 5K2s, 5Ks, HSU subs, Pio 151FD, Dish VP722, Roku, Wadia I70, Anti Mode Dual Core, Oppo 103D Vanity Lite
Office: SBT, Berkeley Alpha DAC 2/MQA, Magico S3 Mk II, Boulder 2060, Lumin U1 Mini streamer, Roon.