Originally Posted by NightFlight
Tubes usually take around 20-30 minutes to warm up in the Lyr; before they operate to their fullest. This should be audible to most everyone. The first 10 minutes are the worst, ad IMHO, not even with listening to - depending on tube and mood. I think this is true of all tubes in all amps, and if your not noticing it - possibly something is masking the potential in your chain.
It is probably also the mosfets warming up too, given they are biased to run fairly heavily in Class A (single-ended) under most loads. I remember back when I had a Pass Aleph 3 (30w single-ended Mosfet amplifier made by Nelson Pass), he recommended (and it was easy to hear the change) that the amplifiers would sound at their best after 1 hour ... Man, those amplifiers got HOT too - almost the entire chassis was actually covered in finned heatsinks ! Wonderful amplifier, that. Fond memories ...
Then there were the Naim amplifiers (bipolar transistors, which I believe were only run in Class B). In those amplifiers, it was best to never switch them off - not even overnight !
Edited by NinjaHamster - 12/7/13 at 8:43pm