kevin gilmore

Sure looks like the inductor is wrapped to the capacitor... Needs more air to air wiring.

I don't see the obligatory ground wire to the wood chassis And you desk is way to clean. A clean desk is a sign of a dirty mind.

I was not aware that mabuchi made motors this expensive

I'm willing to expand my horizions... Besides which i have more than 8 tube Mcintosh amplifiers... Too bad no one makes transformers like that anymore. And a classic original Marantz around somewhere... Plus the two short wave radios (they probably don't count...) Better than running 200 volt black gate power tank capacitors at 350+ volts... Should not be very hard to assemble, I think i can manage.

http://gilmore.chem.northwestern.edu/t2chassis29.jpg Soooo close... 1 more resistor value on backorder wire stax jacks Will finish wiring the power supply tomorrow. Few more screws, nuts and bolts...

I'm serious... The singlepower extreme with ipod is in the master bathroom. With the large soaking tub its a great place to listen to music. (shades of billy)

I'm in on this if there are any left. Don't have a tube system for the 3rd bathroom yet...

The 534-1847 are the wrong size, I will have to measure again... Should be 534-3487... So .5 instead of .625 (actual is .55 which is .5 with a .05 spacer) I ordered .375 anyway ??

I always test the AC out of all transformers first. And unloaded power draw checking for shorted turns. In fact i also check every semiconductor (especially the led's) and measure the resistors. Saves a lot of time later.

all 3 transformers mounted. http://gilmore.chem.northwestern.edu/t2power2.jpg need slightly longer 1/4-20 nylon bolts Its starting to get heavy...

Correct value 10k. Mentioned a few pages back. And when i tested the low voltage supply and found the -12 was -19 i knew instantly what was wrong. So far, 2 silk screen errors. Total. Plus the holes on the 3381's a bit tiny. Plus one zener hole a bit tiny. Pretty fucking good for a project of this magnitude. I challenge anyone to do a project of this scope and get it 99.99999999% right the first time.

OK, here you go http://gilmore.chem.northwestern.edu/t2powerfix.jpg http://gilmore.chem.northwestern.edu/t2power.jpg cetoole... a naar veizt men nit kayn halbe arbet

No, you are WRONG... shorting out the current sources and there is 6db more noise. I just measured it. But no reason for me to argue. Dynamic impedance of the current source reduces the noise. NOTE!!!!! D20 is labeled wrong on the power supply board. Needs to be flipped. Schematic is correct. Power supply and time delay circuit now fully tested. picture of D20 correctly installed soon.

Very little current overhead when running correctly. Otherwise it goes into heat. Where else would it go. Unlike some other power supplies out there, this can be tested with absolutely NO load. Easier for people to put together. There is a fully shunt-regulated version of this that has been on the drawing board for a while. Justin was going to make an upgraded supply for the BHSE, i do not know if this is still in the plans. Not cheap. Cooks eggs for breakfast. The stability and ultra low noise is the key factor here. To do a dual tracking version (in this case, quad tracking version) gets even more expensive due to the 1kv isolation opamps necessary to get the control signals to the bottom rail. I could have saved one ref102 by using one for both the +250 and +500. This is not about saving a few dollars.

1) Noise reduction. Less than 1mv of noise on any of the high voltage lines. 2) output caps charge much slower, no massive input current peak to toast the pass fet. 3) limits output current in case of a tube short. Fuses unnecessary. For the 2 by 500 volt supplies, the one CCS could have been driven off of the center tap of the transformer, which currently is optional. Save about 2 watts that way. Maybe for round 2.

these are pictures of the pins i want. http://gilmore.chem.northwestern.edu/tagboards.jpg

I'll get a quote on some top and bottom panels machined out of pyrex and/or synthetic saphire. You probably won't like the price, but maybe i'll make one set just for fun. Top for the power supply, and bottom for the amplifer.

updated http://gilmore.chem.northwestern.edu/t2schempower.pdf http://gilmore.chem.northwestern.edu/t2schem.pdf (6ca7 resistor now R93) (have no idea how that happened) generated from the layout software http://gilmore.chem.northwestern.edu/t2bom.txt (realize that you have to multiply most stuff by 2 and battery parts x 4)

updated schematic for the power supply board with all known corrections. (i think) (its all really minor stuff, missing .1uf caps, wrong resistors for 555 timer) (labeled diodes, missing 2 diodes) http://gilmore.chem.northwestern.edu/t2schempower.pdf if someone finds more errors in the schematic let me know. At least the board is known correct.

Someone smart should buy up the singlepower domain when it comes due... Which would be in june of 2015... Probably too long to wait for a joke...

All 5 power supplies tested at 20% over load. At the same time. Prototype transformers definitely seem OK... Had to stop when the fluorinert jug started boiling... (where else do you put 5 high voltage dummy loads) http://gilmore.chem.northwestern.edu/t2powerboard.jpg

500 volt power supply tested, full power, 20 minutes. Total cold to warm variation .2 volts. Nominal output voltage, 500.1 volts. I have not fully stuffed the other 3 high voltage supplies yet. But they are all cuts and pastes of the 500 volt supply, so i'm stinkin happy over this. Will finish stuffing and testing tomorrow. I can't find the + and - 12 volt regulators Yeah Team...

7 more heatsink sets are machined. (plus the set i have, and the one set i shipped) I wanted to do some front/back panels this week, but was just too busy. Hopefully monday. I'm pretty sure i have all the remaining parts for the power supply board, so i should be able to power it up this weekend. justin should be shipping me more front/back material very soon. i already opened the holes for the 3381's a couple thousandths. fefore i shipped the boards to people... my test 3381's fit fine... There is no reason to cram it all the way to the circuit board, in fact it should sit about 3mm above the board.

What i mean to say is that all the circuit board/chassis sets are spoken for. I certainly have not shipped any of the chassis sets yet. They are not even done yet. This week i hope to do 2 more sets of heatsinks, then off they go to anodizing. Next week the same thing with the front/back panels. I may have to come in on a weekend or two to catch up.

All of the boards/chassis sets are now sold. Will keep the 2 people wanting units on the overflow list should one of the earlier people change their mind. I could do another run of boards, 10 minimum, but the price would go up a bunch. And i'm definitely NOT going to do any more chassis sets.