kevin gilmore

all these board files updated with latest parts, changed batteries,mini heatsink etc joamat board files http://gilmore.chem.northwestern.edu/t2shrinkedv10.zip http://gilmore.chem.northwestern.edu/t2250.zip http://gilmore.chem.northwestern.edu/t2hv2.zip slightly shrunk board for lil-knight chassis http://gilmore.chem.northwestern.edu/t2shrink2.zip original board http://gilmore.chem.northwestern.edu/staxt2nc3fdh7.zip

black and white ebony

http://gilmore.chem.northwestern.edu/ksa5-13.jpg done (except I'm out of #4-40 nuts, one missing on power supply)

new board is exactly the same size as the original board. 11.95 x 16 inches and fits the original case i made and all the pots are in the same place. The test points are in the same place. A couple of led's have moved slightly and a whole bunch of led's in the batterys are removed. not the slightly shrunk board for lil-knight case which was 11.95 x 15.65 inches thru the miracle of cut and paste, this version is almost complete, just need to do the heatsinks in the middle. joamat's amp board is 9.35 x 12.02 inches

none of the board mounting holes or pot locations have changed.

full size layout modified and sent to joamat for checking original board with all the mods http://gilmore.chem.northwestern.edu/staxt26.jpg still needs the pot on the fqpf2145

could go back to my original board and make all the changes to it, but I don't think anyone would be interested in that.

like the flip the transistors back to back idea.

you mean Q32, heatsinks added http://gilmore.chem.northwestern.edu/t2modified.jpg pot now in parallel with resistor, use one or the other. or pick a higher resistance and trim down. oh that R31. yeah 22k. but that and the center of the pot is now 10V

Q23 is on the heatsink in all 4 places. I have edited all 3 boards to make all the horizontal resistors .6 inch waiting on more feedback before I post there is no 22k resistor http://gilmore.chem.northwestern.edu/t2schemmodified.pdf and the voltage is now 10v on the diff pair.

one repository, some schematics there. one of these years I will clean it up. if people know of schematics that are current and need to be in the public place, let me know.

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