['LIVEWIRE?']

Since post # 90, I have checked the data sheet and reduced the bias setting. the indicated anode current on my DMM when I was working on the amp. earlier today stabilized at 65mA. I'll check it again tomorrow or Monday, and reduce it a bit further to somewhere between 0.04 and 0.045A. However it has to be remembered that this is not my amplifier, and, if the owner wants the bias upped, then so be it, though I would point out that this will shorten the life of the KT66's in that case. (Apologies, Steve, I've now found the KT66 in the drop-down list at the head of that link, and from that, the bias current figure as above, which would result in a dissipation of between 16 & 18 watts well below the maximum of 25.