Quote Originally Posted by Ali Tait View Post
ECC88 and ECC82 are not interchangeable. Change it for an 82 or equivalent.82 runs a plate voltage of up to 300v,the 88 only to 130v or so. No wonder it's running hot. Take it out pronto! They are not pin compatible either.
Thanks for the heads up Ali... I only just realised that I got tubes mixed up with those I saved for use in my Assemblage pre-amp!

I'm currently abroad now and will rectify the situation tomorrow when I return home. Having said that, the DAC was kept running pretty hot for at least a couple of hours before I turned it off