kevin gilmore

that is the point of this new board. all the sand is mouser available. but in general the semiconductor companys are all getting together to make sure decent audio is a thing of the past. What good are the new lateral mosfets, and the monster bipolar transistors if you don't have the parts for the front end.

and another version with the bigger heatsinks http://gilmore.chem.northwestern.edu/dynahibal8.jpg

I finally have decided to declare failure on sourcing jfets, so this should be happening soon. http://gilmore.chem.northwestern.edu/dynahibal7.jpg uses that340 input bipolar chip needs serious checking mje15034/mje15035 are probably a better sounding set of outputs

the extra resistor and zener are because of blubliss. He insisted on using this supply to power his ES2 and it was not really designed for lower voltages and much higher current. This mod makes the outputs share the current better.

Well I never had an issue with this either. But some of the new caps come with the coating Pre cracked

fixed that one. if you find more let me know.

looks like a nice tester. But it can't test the high voltage stuff. I will buy one anyway.

for the next board run http://gilmore.chem.northwestern.edu/kgsshvps8g.jpg

make sure you have a pot connected, or the inputs shorted to ground.

OH lookie... schematics removed from their website. That was fast.

Needs moar capacitors

Well at least its a better circuit board than rudistor. two open loop triode gain stages with cathode follower output. .001% thd at what output level? a nanowatt or two. more or less a singlepower extreme with a lot less power.

something in there other than snow otherwise the weight would flatten that car good.

40 kHz oscillator driving chip amp driving small transformer. same way craig does it. Easy, cheap and makes biasing much easier.

I still have dishnetwork because of all the scifi... I know its stupid expensive for what I watch.

here is an alternative which i'm doing in addition to everything else. a 1 meter dish pointed at amc21. and a satelliteav hd receiver. total cost about $250. plus installation. Tune it to pbs and have gobs of free programming forever. In very high bitrate mpeg4 which can't be broadcast at that speed. Nova and the like are just stunning eye candy. Add a usb hard drive for $50 and record the stuff for playback later. http://www.satelliteav.com/p/shop/?ws_pid=1593&ws_cat=446 http://www.lyngsat.com/AMC-21.html or add a motor, then more free tv to watch than you can possibly imagine.

i did not even know Phillips made a 2sc3675

so it turns out the hawksford already came up with the idea of cascading a current mirror (well sort of) http://www.essex.ac.uk/csee/research/audio_lab/malcolmspubdocs/J10%20Enhanced%20cascode.pdf it also turns out that the single ended version where you ground the input, and then drive the emitters makes an absolutely wonderful I/V converter for your favorite dac. also previously released in a simplified version by pedja rogic. http://gilmore.chem.northwestern.edu/privstage.pdf so the building blocks are now piling up. need a really sweet output stage (not the headphone kind) and this preamp should be able to compete with the big boys.

the stuff i used was custom made for the military and is pure silver. not going to try to buy more of that.

This is instead of the multiamp board. Input switching This board Pot of some kind Diamond buffer output There is nothing wrong with the multiamp, in fact it sounds great too. But the input impedance is lower due to supersymmetry. The idea on all of these is to eventually replace with jfets once they become available. As it is, this new board is without feedback of any kind, and is faster and more quiet. plus gain is a single resistor and compensation is unnecessary.

first cut at the board http://gilmore.chem.northwestern.edu/ubaltobald.jpg

Gore will happily make you anything you want. Minimum of 5000 feet. You will not like the price. I use 50 ohm cable.

updated schematic with servo http://gilmore.chem.northwestern.edu/kgsshvproductiondual.pdf

here is the unbalanced/balanced to balanced front end. http://gilmore.chem.northwestern.edu/ubaltobald.pdf really sweet sounding. 0 db of gain balanced, -6db of gain unbalanced. gain is controlled by R5,R32 so i could put a relay in that switches the gain to maintain 0db (or any other number) when you switch from unbalanced to balanced. still even better with the that340 replaced with jfets. mpsw06,mpsw56 replace 2sc2240/2sa970 when we can't get them.

i have known about this for a while. Its about 4000 sq feet of stuff. There is a few pieces i would be interested in, but very little of this stuff is actually useable these days. I would love a mint hammond organ with 2 tone cabinets and 2 leslies. (not sure how i would get it in the basement)