After much scratching of head my problem amp, (above post), is now working. Yipee! The cause: yep, human error. I somehow managed to get C1/C6 mixed up with C7/C8. All seems to be working ok despite one 220uf cap rated for 16v being subjeced to 48v potential. (I may do a replacement for new caps...

I am a new convert, actually a returning convert back to DIY electronics and audio and would be interested in doing an O2 build for my next project. (My recent SSMH is stuck at present, reasons unknown). My concern with the O2 is the difficulty of getting a PCB. I am fairly confident I could...

This is my SSMH build using 12AU7 and suggested circuit mods. It looks great, I think, only problem is it doesn't work!    

Hi all, I have been lurking for a while after first discovering the amp then making it. This is the 12AU7 version with changes to bias:-     Well, it looks very nice, I think anyway, but no ways does it want to work! The tubes don't glow or warm up at all, Neither will the mosfets show...

> Are you sure about the reflex dot? I think it help's the high frequency BT the bass?? < Whoops, Twinster, I must have warped out! I had bass on my mind... Can I edit that?

   New to the party and getting back into DIY audio after a very long break, Hi to everyone! I have I think been very fortunate to discover this forum and this thread in particular!    Having now aquired the relevant beasty's and spent some time breaking in and getting a feel for the unmodded...