Necro Fack!

My IIC+ started making intermittent 'rustling leaves' noises and it would be affected by smacking the side of the amp. I swapped the Sylvanias for the SEDs mentioned above and no noise (and no pop when switching standby). I suppose it is possible that the pins of the Sylvanias are just a bit too small for the wallered out sockets so I should probably try retensioning but damn I've been having bad luck with these old Sylvanias lately.
Oh yeah, BTW, I at first tried a pair of JJ 6L6C and they sounded horrible. I was surprised how bad. Boomy fizz. The SEDs are worlds better.