mwhouston
New Head-Fier
I was given these prototype cct. brds. (populated) some years back but only recently have I started to listen to them. There was a K311 and now a K311B and I think there maybe a "C". I have the schematic but at this point will not publish it. The amp is by Oatley Electronics. It uses two 2SK170 jFets for amplification but a strange power FET push-pull config to drive the HPs. It burns a lot of current and the power FETs are mounted to on-board heat sinks. Strange.
Lets get stranger. The PS it comes with is a switch mode. The way I have assembled this HP amp is with the PS external so a linear PS could be used. BUT I can find nothing wrong with the SMPS.
And how does it sound. Apart from having too much gain (witch can be corrected) the sound is big, bold and driving. I love it with my new Beyerdynamics DT770 closed back HPs.Love it!!
Lets get stranger. The PS it comes with is a switch mode. The way I have assembled this HP amp is with the PS external so a linear PS could be used. BUT I can find nothing wrong with the SMPS.
And how does it sound. Apart from having too much gain (witch can be corrected) the sound is big, bold and driving. I love it with my new Beyerdynamics DT770 closed back HPs.Love it!!
