Hot and cool valves

[bob orbell]

Hi chap's, I have question if any one can answer it, at the moment I am using a WA88 power amp. it has been performing good for 4 or more years, it still is performing good but this morning I gave the thing a dust, it had been on for about one hour, after switching off I let it cool for 30 seconds before removing the valves, now hear is the interesting bit, looking at the amp from the front at the four power valves (KT88)s from left to right no1 valve cool to the touch, no 2 valve very hot, no 3 valve cool, no 4valve very hot, suspecting valve problems I reversed the valves switched on and left for ten minits, same thing, one valve on each chanel very hot the other two I can bear my hand on them even after one hour or more, the other two will take my skin off, I have checked heater voltage and that is spot on, will do more voltage checks in the morrning, any thought's. BOB