kevin gilmore

I'll second that one. Never figured it out either, i don't know how they can continue to sell those things, every time i try one even in a simple circuit i have trouble.

stax has always come up with unique circuits. The srx circuit is all about differential gain usually from a single ended input. You have to model it in spice to see what is going on, but there is voltage gain from both sections of the input amplifier. Synthesis later when i have some time. Front end is good for 45db of gain. If the output stage has 20 db of gain or more and the closed loop is 60db, that leaves 5db for feedback. Something mikhail clearly did not understand.

If some company would just make transformers as good as the ones in the quads, things would be much better.

But But... A Bentely is a volkswagon. So is the Lambo. and the Bugatti.

bankers lamp with one of the new GE 100 watt equivalent A19 LED bulbs. Plenty of light.

Mobile and 30 watts per channel ??

Due to the required balanced output for electrostatics, the balanced is better thing ends up coming along pretty much for free. Also the fact that you need a voltage gain of 500 minimum, and usually a more reasonable 800 to 1000 forces an open loop gain of at least 2000+. Something that is virtually impossible with any 2 stage tube amplifier, without massive amounts of distortion. This was the main reason why most of mikhail's esx things had volume/balance problems, because even with some feedback there was not enough open loop gain to level out the amplification. You certainly can do the input stage with a transformer, but if you want 10 to 20db of gain from it, the input impedance of the transformer is going to be under 1k ohms, otherwise there will not be enough output current to correctly drive the input impedance of the first tube stage. The hev90 was unbalanced input only, and then followed by a phase splitter anyway. So replacing the exact same 2 triodes with a differential amplifier results in more gain, less distortion, and better balance. For the nelson pass supersymmetry thing to work, you have to have at least balanced outputs.

Opa1632 with a servo is a better and lower distortion way of doing that Lower input impedance however

http://gilmore.chem.northwestern.edu/kgst.pdf not 100% sure if that was the final revision.

I would probably not go back to everest, lots of other places to try. froggy's in highwood is right off the train station, and definitely does lunch M-F http://www.froggysrestaurant.com/location goosefoot is on my list of stuff to do soon.

Well if you really want to stretch the budget there is always Everest or Alinea

le france closed years ago. carlos closed in january, replaced by high end burger thing. le-titi is closing in june. not much high end french left these days in chicago.

1 or two for me please

I'll take a couple of those adapter boards, i have a bunch of those pots...

That is the alpha pot. Very nice actually and of reasonable size.

Yep, that one is virtually done too. I've been spending time on other stuff, but the prototype definitely works. And works well.

Unfortuantely i have cleaned out the local binny's of all cask strength rye and bourbon. At least till they restock next month.

Kerry still messing with the multi amp I'm waiting on hopefully final preamp boards

I was trying to keep it a secret. That way i never age. Thanks for the good wishes.

The first one is easy. The blind mounting thing I use, make the flange Part a bit thicker, and maybe a bit bigger in diameter Drill a blind hole in it, but in a spring and a small ball Then machine indents on the face panel or an additional Blind piece. You could do the same sort of thing on the shaft directly on the inside. For the lock you need something similar to The ten turn locking knobs Or a setscrew behind the spring if doing it on the inside.

You proably don't want to do that. 700 volts on tubes that should take no more than 450v. But the voltage gain is similar, so if the tubes don't arc, it would work.

rmaa is not the problem, it is the people who use it, especially with 16 bit sound cards, then don't set the levels correctly. If you have an 18 bit or better a/d and you set the input level at -3db, then adjust the gain of the amplifier under test to the equivalent -3db, then the numbers are at least close to equipment that sets the gain automatically. But if you set the levels at -10db or worse, on a 14 bit a/d, then you get silly readings.

unless you are mikhail in which case 800 volts is no problem.

Just wait till he releases his threatened "timex vs rolex" article. I have no idea whats in the pile of diatribe, but i'm sure there are going to be lots and lots of pissed off people. Something continues to tell me that since he thinks the benchmark is the best thing since sliced bread, he probably had something to do with it, possibly working as a consultant to them. Very few people would pay retail price for something like a dscope, and those that would probably would buy the audioprecision. at least he does not sand off the numbers on the chips. So one could probably reverse engineer the thing in a few minutes. And lay out a compatible board in a couple of hours. The issue would be the availibility of the chips. Since he is all about extremely low distortion numbers et all, you know that he is going to rip nelson a new one, because most of his amps are in the .05% to .1% thd range.

Well... If you have a high impedance source, and a low impedance pot (say 10k or less) you can loose a few db even at maximum volume.