Amp "timing" ?

I was doing some tube rolling. I had a bunch in the phono pre and it sounded a little clearer on the night. Few days later, the sound wasn't great. Played an album, "Friends - Manifest!" Not great. Flat, musically all over the place. Put tubes back. Lots better. Everything snapped into focus including timing. 

@tomic601 : " the swing of a sweet light double"

I doubt many people here have any idea what that is referring to.

@n80 well with you, there are at least three of us that will get it....

nobody as yet bit on the Dylan, so my expectations are low...

I was reading someone raving about the impeccable "timing"
  Can someone please explain what is meant by this term?

It all starts with the source, if it doesn't have it then it can't be made up down the line properly, a device like the Schiit Loki can lift it artificially, but your not listening to a flat FR then

Cheers George

@stevecharm

The only maeasurable parameter that might, and I emphasize might, be involved here is the amplifier slew rate, that is, how many volts/microsecond can it increase?

Slew rate really doesn’t effect how “quick” the amp is, though it seems like it would. All slew rate tells you is how much wattage it gives for a frequency range.

If you have a slew rate of 24V/microsecond and you have 100W into 8ohm (~80 Vpp, ~28Vrms), that means it’s frequency range is about 48kHz (meaning it can accurately reproduce 86kHz sampling rate).

(2π • 48000 • 80) / (1,000,000) = ~24

It’s not 1:1 with the impulse/decay response.