kevin gilmore

I have some of those for the dynafets i am going to build soon, got them from marc. the ceramics seem like a much better idea, lower capacitance and guaranteed higher breakdown voltage. (i think)

Does anyone have any specs that make sense on the 4171G. Like what the real max voltage is? Errors in the spec sheet have the thinner one being able to stand more voltage. They only need to withstand 600 volts max. I assume that thermal grease is required when using the ceramics... Too bad no one makes berrylium oxide pads.

I like inu's parts, and just ordered a bunch of them. I wonder what the spec on the voltage of the washer is?

yep it was in the power supply... currently the screws are all stainless. Because i have a bunch of them, and they look cool. Got nylon screws coming, but if i can find peek screws that is even better. I use peek tubing for all the LC's... on second thought, at about $7 per screw, and 64 screws needed... maybe spritzer will do it. I know there is no reason not to be excessive, but that is a bit nutty. Need to verify that they are really stronger first.

And after a few hours this is what happened. Due to the current limited power supplies, absolutely NO components burned up. http://gilmore.chem.northwestern.edu/arcscrew.jpg I'm switching to acetate screws once i find some.

The resistors ARE on backorder. But they are not really important as they are the input filter. Too bad i did not wire the stax jacks, I would have something to listen to already ATOMIC BATTERIES TO POWER TURBINES TO SPEED PHASERS ON STUN http://gilmore.chem.northwestern.edu/t2amplifier1.jpg all voltages look good... Filament transformer is a slight bit high... The output tubes are 6.5 vac the input tubes are at 6.7 vac. Don't trust my 30 year old meter, so i'll bring home something recent and calibrated before i re-spec the filament transformer.

http://gilmore.chem.northwestern.edu/t2power3.jpg Got to find better 1/4-20 bolts. 2 of them have cracked off at the screw head.

Patience grasshopper. It will make music soon. Very soon. Have to finish power supply first. Worked on it 3 hours today and 2 hours tomorrow should finish it. Had to go to tristate electronics for the right size spacers. Ordered the rest of the parts including xlr connectors to make cables with which to hook it up to a source, plus the right sized spacers for the amp board. No reason to rush this, it will be done in plenty of time for CJ010. I want it perfect the first time it powers on.

updated amplifier schematic http://gilmore.chem.northwestern.edu/t2schem.pdf

another correction to the bom the spacers (.5 inch and 2 inch) are supposed to be 4-40 not 6-32

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.