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Posts by kevin gilmore

 This has nothing to do with money. Nothing I do is cost effective. This is like timepieces.  There are timepieces, complicated timepieces, and grand complications. This thing is a grand complication. Just like the diy T2. Yes the transformers are a significant issue, and run of the mill stuff is going to arcy-sparky acrossthe secondary to the primary. This will require transformers that have 4KV wire and isolation. And I won't be doing microvolt noise 1000V power...
here is the preliminary amp schematic. I'm definitely going to change the output stage bias to the nelson pass opto isolator thing. there is no power supply schematic yet. i have not started on the boards yet either and this is definitely going to be a 2 box thing. all current version boards and some schematics (its a work in progress) here
maybe the next version of the verto will chuck the music driven bias and the improper loading of the transformer that attempts to control the ringing. And then it will be just like a srd7 first version of the electrostatic circlotron actually works and no flying parts. There is some output stage crossover distortion due to me running at a 1ma bias, which i will change later. Not sure that many of the diyers will like the 4 x 1000V floating output stage power supplies...
not going to be that big. The atmaspheres are AC coupled and into high impedance can probably only do 100 vpp mine are dc coupled and 2000 vppss
I guess it was time, but the stax mafia is working hard on a circlotron for electrostatics. I have 2 versions, one of which is all solid state, and fully dc coupled, and the other uses a pair of 6s4's for the gain stage, and either triodes, or ultra low capacitance silicon carbide fets for the outputs and is also fully dc coupled.   circlotrons make my brain hurt.  Its all Jason's fault.
you should look at the esp950 schematic to know why it sounds so item is the massive amounts of feedback courtesy of a front end opamp.another is the 25 microamps of bias current.what you want is enough current in the output stage to keep the amp in classA all the way to clipping with a sine wave at 20khz into 120pf
 That is a completely different gain and output stage. Off board only and very large heatsinks
srm-007t, srm-006t,srm717,srm727  are all +/-350V power supplies caps are usually 400V caps and the supply is unregulated, so there has to be room for high line.   The stax spec is Volts RMS stator to stator   kgsshv is either +/-450v or +/-500v power supplies   T2 is +/-500V power supplies   koss is +/-600V power supplies
like most other transformer boxes the Verto should work much better with Dynahi, SS Dynahi, LAu or Darkstar all of which have much higher damping factor than the rkv2 and similar voltage swings, or greater.
the answer to this question is very complicated.   if you look at some of the thd vs power level graphs that tyll did (I can't find at the moment) you will see that most amplifiers have more thd at very low power levels than they do at higher power levels. Some of this is because the measurement is actually thd + noise. Even with pure class A, the lowest thd numbers are usually at about 80% of the amplifiers maximum output before clipping. This usually applies to OTL...
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