07-20-2012 Post does not mapped to Knowledge Tree RonyWeissman Lyon, France Posts 138 Joined on 05-29-2004 Post #: 1 Post ID: 18428 Reply to: 18428 Tube GU-29 fiogf49gjkf0d Hi Romy, Do you have experience with this tube ? I have seen it for first time in german amplifier recently and am curious. R weissman

07-21-2012 Post does not mapped to Knowledge Tree Romy the Cat Boston, MA Posts 10,156 Joined on 05-28-2004 Post #: 2 Post ID: 18431 Reply to: 18428 Another beam tetrode for high power SET? fiogf49gjkf0d Nope, I am not familiar with sound or applications of this tube. It is indirect heated beam tetrode – why would it be any different from the whole family of beam tetrodes?  From my perspective it might be interesting for ULF DSET solution as it has a lot of power but I do not think your German people use it for DSET configuration. You know my answer to it: instead of rising power in full-band amplification I tend to advocate raising sensitivity of loudspeakers. "I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche

07-21-2012 Post does not mapped to Knowledge Tree N-set Gdansk, Poland Posts 617 Joined on 01-07-2006 Post #: 3 Post ID: 18433 Reply to: 18428 40W fiogf49gjkf0d 40W max plate power diss. is not impressive and for sure a joke for a serious high-power set. I remember doing some intellectual excersise/pspice sims of a DC coupled GU81M. Much more serious tube and IIRC on the sims it looked promising. Search the site and contact me if you'd like to try the design (i'd need +/- 200yrs to get to it Cheers, Jarek STACORE