kevin gilmore

joamats power supply boards are single sided and are 8 x 5.83 inches each so you would save about 1.2 inches. http://gilmore.chem.northwestern.edu/t2psnew1.jpg http://gilmore.chem.northwestern.edu/t2psnew2.jpg pretty sure the boards are done, someone please check this one carefully http://gilmore.chem.northwestern.edu/t2modified.jpg

there is a verion of the power supply board that is 11.95 inch wide x 9.2 inch deep with all the electrolytics in there, just don't see a way to make it much smaller. joamat's may be slightly smaller, and 2 boards might be easier to build.

Its back up. So... critical updates forced the machine to reboot. At which time the machine determined that the cmos battery was low, and stopped. Have new battery, will install Monday.

a little of everything but mainly the gap. calculated with maximum displacement of the diaphram

better yet, that is a mercury rectifier, and clearly there is a blue glow indicating that current is flowing. Which would be impossible without the plate cap hooked to anything.

BL

label was flipped, wiring was correct. 3675 label also fixed.

don't think that can happen. latest, with input pots, done for the day. and I did spell his name wrong, will fix that later. http://gilmore.chem.northwestern.edu/t2modified.jpg

there is no 2sk216 in the battery. The 2sk216 feeds the top of the battery. also there are no 1k resistors to measure the batteries with, I will fix that.

correct values are 100 ohms gate, 300 ohms cathode. fingers getting tired after a day of typing.

here is the schematic http://gilmore.chem.northwestern.edu/t2schemmodified.pdf hopefully the two match.

after the rebuild. icarium posted many before pics. http://gilmore.chem.northwestern.edu/ss1-10.jpg http://gilmore.chem.northwestern.edu/ss1-9.jpg http://gilmore.chem.northwestern.edu/ss1-8.jpg but the thing really is insane for size and weight vs power. its my balanced squarewave boards, and a Chinese remote controlled step attenuator. its hard to tell what it originally was. But I think the following a balanced section with the digital remote controlled step attenuator a balanced section with a goldpoint rotary attenuator a balanced section with knobs on the side for adjusting the output stage bias, something for frequency, and some other unknown knob. there was also a crossfeed knob.

please check for errors http://gilmore.chem.northwestern.edu/t2modified.jpg

Very Nice

suggest you buy as many 2sk79 and 2sk216 as you can, you are still going to need those. no suitable replacement for those yet. All the other parts are mouser. http://gilmore.chem.northwestern.edu/t2modified.jpg Getting the power supply to match that physical size going to be just about impossible.

JoaMat has sent me the board layout, and I'm working on it. He did not need silkscreens, everyone else is definitely going to need them. Could do it as 1 board instead of 4. As one board it would be 11.77 x 7.8 inches. So a bunch smaller than the 16 x 12 of the original And using 10m90s definitely removes a bunch of parts. And so does the lt1021, although that one part is probably double the cost of the led's and fet it replaced. Way more stable though.

The idea is to build a whole bunch of different amps in cases that I don't care if they get scratched and then maybe show up at a few meets so that people can hear this stuff and know that all of them blow away most if not all of the current batch of overpriced crap. ss dynalo balanced is done (two of them actually) ksa5 will be done soon. will do the squarewave next. ss dynahi after the squarewave. Pretty sure I can get it in one big hifi2000 box. no, I'm not going to travel with the SS1. It would take up the entire trunk.

I love it a lot. lt1021 makes perfect sense, very stable part, stack of led's not needed etc...

http://gilmore.chem.northwestern.edu/ksa5-12.jpg finally putting it in a chassis

sweet!

get a VERY HIGH QUALITY SACD source. then get all of those prestige jazz sacd mono re-issues... blown away you will be.

just the volume knob set to zero is sufficient. the servo will get rid of a few mv of input offset. however as you turn the volume knob you will hear some "whooshing" depending on how much input dc.

I am really liking this amp. (I am possibly biased, usually into class A) Simple and effective. These boards are for all Motorola parts. each board is 300ma, so I think a sigma22 would work fine.

20pf for that. Supersymmetry is guaranteed unity gain, so no issues with any amount of gain. but gain of 2 unbalanced is as low as you can go with the topology. but unless you have a very high voltage source, what you could end up doing is clipping the source and essentially putting very nice square waves into your headphones.

its always 36 vac ct for the low voltage stuff. necessary to make about +20v and -20v to regulate down to +15 and -15 6.3V is for the filaments no idea where the 15vac came from. values should be the same 350v or 400v, possibly trim the one offset resistor.