kevin gilmore

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... ?

mpsa06 is fine for those, very low power. Fairchild version should be available for a long time.

The problem with that one is that it is incompatible with the way I make my knobs. The same guy had the standard shaft model which is what I cleaned him out of. would love quad black beauty or quad noble pot. new goldpt 47 position quad pot is over $450 might as well buy a P&G

Low input impedance amp. 10k quad is best. There was a guy on ebay selling them, but I cleaned him out. And I need more. Group buy thru partsconnexion is 100 pieces minimum. Which is stupid.

board version with surface mount outputs is done, just need to verify. people with current boards should buy mpsw06/mpsw56 now

mpsa06/mpsa56 can be substituted everywhere except the outputs on the kgdynalobal (have to check power levels on dynahi)

you install either the LO resistor, or the DT resistor. one is for dual tracking, the other is for local feedback don't install the current limit transistors.

I would hurry. last order date dec 31 last delivery date in may but the following parts are identical silicon in surface mount pzta06,pzta56 so will have to make adapters because they require 6cm2 of heatsink copper

well I just bought a lifetime supply of the mpsw06 and mpsw56 just to make sure. And at 1000 pieces, dirt cheap. TT electronics is probably the best bet, have to get a quote from mouser so group buy kind of thing. going to search available Japanese companies now. looking for 80v npn and pnp, 1 watt

fuck me. but what else is new i think there are fairchild equivalents, but maybe not same pinout.

so for entertainment I was looking thru the SR price list. Sure enough 394A Mercury Thyratron... $250... Now to go and find some with the socket. Must have the blue shinny

anything >+/-12 and < +/-35 the amp works fine with 15v or 20v power supplies i am using the power one linears, in 15v mode they typically can be turned up to 16.5 which works fine and you can't build anything for the price of those. or in a bigger box you can buy the 20V units (24v, turn down to 20)

that circuit flat out does not work for balanced amplifiers especially with dacs that have output dc. you want this http://gilmore.chem.northwestern.edu/boards/protect3.zip

yep

where is Ray Samuels and his magic military solder and wire when you need him. OH wait, the guy finally retired.

now that I see the tubes, major stupidity. but really, what did you expect. The one on the left is a standard low voltage high current mercury rectifier. filament and plate anode. The one on the right is a grid pulse thyratron with the plate disconnected and the grid used as the anode. Basically both are driven as equivalent 30v say 10 watt zeners. Then the dc is applied to the shield wire of the cable. Same trick as audioquest cables that use the 24 volt battery Does not do anything. Never did anything Evidently Mikhail built something very similar. But look at the blue shinny.

volume and balance now working with the real attenuators http://gilmore.chem.northwestern.edu/dsc_0626.jpg something else could be used to feed the serial port with an infrared or web based controller.

That hurts. True, none the less.

i've started working on the 4dsystems 3.2 inch touch lcd again. I think its the right answer whether you use it standalone, hooked to a arduino, or raspbery pi, beagleboard etc. still looking for an easy solution that combines this display with a wifi enabled web page controller. (yep i'm lazy) will publish the 4dsystems standalone code when i have time to test it.

srmXh the same as the srm212 schematic http://gilmore.chem.northwestern.edu/srm212.gif also this http://gilmore.chem.northwestern.edu/srmxh.jpg yeah i know its old

One of the variants of the "rabbit out of the hat" sketches has Bullwinkle saying, "Don't know my own strength." I already have an es1 I rebuilt, pictures were posted. Mine is a 2 box because the amp box was much shorter. But really I did not need 2 of these. The SS1 rebuild was it for the monster singlepower disasters.

you have to use the servo on this amp. not designed to work without it. you would have to very carefully match the input fets

there is no way that is a T2. for a start the transformer is way to small and no way to stuff all those parts in a box that size

garbage in, garbage out. but the 10khz dac output is really messed up