Quote Originally Posted by Simon Barden View Post
Its a strange amp as the AC seems to be rectified to DC, then there must be a frequency inverter section to convert some power back to AC to pass through the transformer to get the higher DC voltage! There is a lower voltage DC output given as 40V, so you though they could have put the higher voltage on there, if only for safety reasons!

Yep, I noticed that and I agree, it's a bit unusual to go about generating the +HT supply in a bit of a roundabout way like that, perhaps it's a cost-cutting measure so that Carvin wouldn't have to put money into designing/manufacturing a power transformer with a separate HT secondary, I wonder if the high frequency signal from the inverter bleeds into the audio signal path of the amp, probably not if it's well filtered-out.