EWBrown wrote:Looks great, I was wondering how well it would all fit onto a 12X8 chassis.
What bias current are you running for the KT-90s?
/ed brown
I briefly tested between 55mA and 60mA, but that was with the 800VCT transformer - dissipating about 30W at idle. I won't fire this one up until I get the other one put together - hopefully tonight.
One note, with my new HP Audio Analyzer, I will start to have top notch gain and distortion data. It is very suprising to see how just a few milliamps less of bias will adversly affect the EL34 and KT90. We are talking twice as much distortion with the odd harmonics skyrocketing. No wonder so many of the old amps, like the Eico HF-87, sounded so good. Of course, that same HF-87 on 124VAC mains today is probably way, way over biased.
Shannon