kevin gilmore

6db unbalanced 12db balanced

looking very good

not sure those are real, the price is way to cheap. I paid about $1 each for the real ones from mouser.

yes the 4686A parts would be in place of the 3675. And since they are isolated, they are easier to mount. The only parts that would not be isolated are the j29 and k216. In a couple of places the 1486 can be replaced with the ksa1156 because they are used at only 250v. And those are fully isolated too.

microsoft iis i don't think so and i'm way to lazy to do a web page if someone knows a way, i can certainly can do it what i can do is sort the directory by date and put it into info.txt file which i will do later

actually 400V - (-110V) == 510v of bias (which is close) but the negative voltage swing is -110v to -400v (less the voltage of the tube) which means real nasty and early clipping

kgdynalobal7 is the all surface mount transistor version of the ss dynalo balanced. yep, lots more surface mount in the future

you do know that the wood is conductive... you need a ground wire for the wood. (no kidding, granite audio puts a ground wire on their faux granite case)

switcher is completely open loop. double the input voltage, and it will try and make +/-500 or so. And parts will start flying.

never had a schematic of the power supply in that unit but i'm pretty sure its the filter resistor and should be the same as r41 i think the srm212 is very similar, will look later trace out the power suppy from the transformer, should be a couple of diodes directly to a pair of caps, then resistors from those caps to the second set of caps

6V filaments are AC the 300V comes from the 450V thru a resistor. no need for extra power supply

plate voltage with respect to the cathode is about 340 volts

no current source in the input stage of the exstata just resistors

triode mode no autobias, if the tubes are reasonably well matched and the power supplys are correct the most offset I have seen is about 5 volts c1/c2 couple from the differential input stage to the second gain stage. c6 and c8 do the same thing to drive the outputs

1mm is .039, and the holes are already .040

6sn7gta or 6sn7gtb only, otherwise arcy sparcy how big you want the holes on the caps?

James lin came up with this, I turned it into a circuit board. cascaded current sources et all. http://gilmore.chem.northwestern.edu/srxschematic.jpg http://gilmore.chem.northwestern.edu/srx6.jpg http://gilmore.chem.northwestern.edu/boards/srx6.zip I did make a few changes including balanced input

lets not forget the cavalli .000000001 % thd at 20hz to 20khz at any level including clipping

Those were SIT's, and evidently had a short life because all the manufacturers went out of business quickly. Static induction transistors. These Silicon Carbide Mosfets (and one company makes jfets) act like standard mosfets except are very high voltage, very high current and can run up to silly high temperatures. Also negative temperature coefficient, so no thermal runaway. And lower capacitance than the crap cavalli uses, so much easier to drive at high frequencies.

would not do 1oz copper. too thin. 2 oz minimum, the original boards were 3oz

about 120ma, measure across the 10 ohm resistors

does not need heatsinks. very low power.

yep, that would work.

the one i had used the 2sc3381 parts same silicon, one was a 5 pin, the other a 7 pin

James Lin insists that srx can be made much better with 10m90s cascaded into dn2540. I have a board pending verification. I have not heard it, so I don't know. The difference between being better in theory and actually being beter... ?