kevin gilmore

http://www.chicagotribune.com/entertainment/music/reich/ct-ent-willie-pickens-dead-1214-story.html

to save space I sometimes do vertical resistors. but everything else is wrong with that amp.

no servo so blackgate output caps on a solid state amplifier taking 1/3 of the board space. yep, great idea

here is why you probably don't want one unless its dirt cheap. you will need to add heatsinks, not easy, and fix all the acetate failure

the singlepower squarewave definitely does not like low impedance loads (50 ohms) making it balanced causes even more trouble. very few of the balanced versions were built, and they are balanced out only when balanced in, and depending on the power brick, they burn up real easy.

definitely not.

what transistors are you using?

even the ksa992/ksc1845, one of them is on backorder till February and i'm going to need them.

Mmbt are surface mount so no you have to check the pin outs for the rest

ss dynalo already has the pot, just don't populate the opamps

this one http://www.audio-gd.com/Pro/dac/RE52/RE5.2EN.htm around 2013 time frame. very nice sounding piece, but no dsd

pin 5 on the opamp is not a NC, so if you want to do this and put a jumper from pin 4 to pin 5 on the back of the board cut off pin 5 of the opamp, or bend out of the way. the best servo of course is no servo at all as long as everything is stable with temperature

better idea would be to use the servo from the kgsshv-carbon but does not compensate for the tube drifting section to section

so pars posted this. http://www.diyaudio.com/forums/group-buys/315474-pure-tube-es9038pro-9028-9018-akm.html#post5259820 all sorts of wrong. lets start with the fact that current output D/A converters really like driving a zero impedance. 27 ohms is not a zero impedance. So with +/-1.2ma you get +/-32mv and then you use the tube to amplify the crap out of it. Nope, definitely not the way to do this. All sorts of noise etc... a while back there was bakoon and audio-gd pointing fingers at each other as to who designed satri and when. so here is the satri version 4 circuit satriic.PDF and here is how audio-gd turns it into both the I/v converter and acss current output and voltage output (one at a time, not both) audiogdiv2.PDF performs better than anything else I have seen ideas in progress as work on the ultimate dsd/r2r dac

servo attaches directly to the plate of the tube. similar to T2. no way to make less complex.

you should buy the right thing from a company that sells linear systems parts

current mirror flips the polarity, so you have to flip the polarity on the opamp. the difference between the 2 servo's is something like 1mv at 7 volts peak to peak output. so very little difference.

no that is not correct. here is the schematic, and I hope the board matches it cfa2cmirror.PDF

grlvplus and grlvminus are the singles split off the original board

trying to build a ssdynahi on the cheap, probably not a good idea.

the pot and the 2 associated resistors are the optional parts. and the values of the resistors change depending on what voltages you want. none of the 4.5 digit dvm's are accurate enough. Especially since if you reverse the leads you get different numbers. In fact 6.5 digit dvm's are just barely enough and the keithely ones in particular read different numbers if you flip the leads. The agilent ones do not. 7.5 or 8.5 digit dvm's highly recommended.

You need all the resistors if you want to adjust the voltage. Otherwise too noisy. The adjust is calculated for about .1% range

shunt regulator for more than 1 amp and 30v, probably a very bad idea without massive heatsinks and really large pass devices B22 also struggles with this due to high voltage differential. I.e. lots of heat

ss dynalo has the servo's in the same place as the cfa amp. the audio signal is nowhere near as much as that in the ksa5, but still the quality of the servo opamp can have some slight effect. I can possibly measure the difference, but don't know if I can hear the difference.

continuous improvement basically trading one opa445 for a opa551, 4 transistors, 5 resistors and 1 cap probably should do the same thing to the ss dynalo.