kevin gilmore

You don't need a leaf spring. It only moves 270 degress... Four turns of wire around the thing connected to the shaft and to ground, and you are done. I've actually seen this done a few times.

you are going to want some ultra low capacitance cable. 2534 is not that by any means. If you are already using an adapter then recabling with the stax cable would be the best idea. Otherwise if you need the sennheiser connector you are going to have to buy the replacement part directly from sennheiser.

The idea on the DACT is to make an aluminum angle bracket, and secure it to the hole provided in the circuit board.

For those doing the DACT instead of the RK50, here is the howto mouser part number 517-647-07-36 unsolder the pins from the DACT. cut the above pins into 3 pin pieces bend the above pins approprately to fit. Use 2 bars of metal (or whatever) .280 inches to space the thing off the board, then solder. http://gilmore.chem.northwestern.edu/dactmtg.jpg

Massive connectivity problems between NWU and the rest of the world for about 30 minutes. Everything should be OK now.

updated schematic with all decoupling caps. http://gilmore.chem.northwestern.edu/t2schem.pdf text list of parts for power supply http://gilmore.chem.northwestern.edu/t2schempower.txt

Wrong you are... Stax's first commercial product was made in 1950. 4 years before i was born.

when i was 21, a lot of stuff was still tubes. power fets did not exist. Things like 2sc3675 and 2sa1486 did not exist. Capacitors of equivalent value were 4 times the current size.

I multitask very well. If i was just 21 years old again, the whole thing would have taken only 2 months. (subject to availability of parts)

i added an extra battery to the schematic, output a bom, multiplied everything by two and this should be the right number of resistors and values http://gilmore.chem.northwestern.edu/t2schem.txt someone please verify.

updated BOM's there are a total of 11 x 8 pin dip sockets. http://gilmore.chem.northwestern.edu/t2parts3.xls http://gilmore.chem.northwestern.edu/t2parts3cgeditv2.xls i decided not to use the split fork turrets, but they are still on the bom. Also the holes for the feet are #10. Should i ever get those rubber things from craig@eddiecurrent I have a DACT in house from justin, i'll show people how to fit it in a few days.

i'm going to import whatever i come up with and then machine it with the 3d mill with a micro engraving bit. I showed an example a while ago...

I was planning on machining it into a chicklet. (a 1 inch x 1 inch square made out of something interesting like pure silver)

Show me what you got...

I think we have a winner... That should get past you know who...

And it needs to be a shallco for historical reasons !

I can't believe i got it done in 8 months. In fact i can't even believe i got it done. And no magic smoke or parts flying across the room. And i only got bit by the high voltage once, because i was working when i was way too tired. Never ever am i going to do something this massive again. Estimate of at least 500 hours in this. Well the hollowed out brick is going to be a one off.... although the boards will be available... I see the beginnings of smoke rising from california Need to find some 64 position balanced shallco's. NO shorts, NO socks, NO underwear... Lets go Native.

Anyone want to design a logo for the T2?? Could include the head-case logo as part of it...

Somewhere on my site is a picture of the monster motor driven variac that drives the transformer. So not only is it isolated to something like 110 db, but the voltage is stable to better than 1%. I also have this thing, which i use to drive other parts of the house. http://gilmore.chem.northwestern.edu/equiinside.jpg

Inu is correct. Neutrik female is 568-NC3FD-H-B (gold) (mouser) or 568-NC3FD-H-BAG (silver)

from craig sawyers, the latest BOM, certainly in much better shape than my mess http://gilmore.chem.northwestern.edu//t2parts3cgseditV2.xls updated schematics, usual place... filament resistors to ground on the input tubes added to the power supply section.

For billys thing last fall, we got to see the circut breaker panel and what was in just that one room. A total of 5 seperate circuits, each with 20 amps. That was just the half of that particular room, the other half had the same thing. Plus there were plugs in the floor that were supplied by an unknown additional panel. Now the heat is a different problem. People should wear shorts and tank-tops. Well maybe not (tyll or me in shorts and a tank top... shudder shudder) Anyone have any male stax plugs?? Want to make a he90 adapter, someone might bring them.

Updated schematic with all the voltages http://gilmore.chem.northwestern.edu/t2schem.pdf updated bom with all the screws. THIS TIME FOR SURE... (i was missing the screws for the feet) http://gilmore.chem.northwestern.edu/t2parts3.xls Ordered the lexan for the amplifier bottom, and power supply top... Got to show it off for CJ. I was thinking of glass, but lexan is going to be easier.

So here are the measured powers amplifier 500 volt line 45ma 22 watts 250 volt line 45ma 11 watts -260 volt line 42ma 10 watts -500 volt line 45ma 22 watts -560 volt line 80 ma 5 watts 6 amps @ 6.3 vac output tubes 37 watts 1.8 amps @ 6.3 vac input tubes 11 watts about 120 watts of PURE class A HEAT. 42 of which go into the heatsinks. power supply 500 volt supply about 9 watts -500 volt supply about 9 watts 250 volt supply about 5 watts -260 volt supply about 5 watts -560 volt supply about 3 watts So about 31 watts into the heatsinks plus the loss in the transformers. So something like 165 watts total power draw. +/-15 volt power supplys less than 1 watt total.

In the usa, 220/240v is balanced with optional neutral and mandatory ground. Air Conditioners,electric dryers, ovens and electronic cooktops are wired this way. I forgot that in the UK the equivalent is actually 480v which is no longer delivered to residential areas. I have a couple of old time pieces of British equipment that require 480v. I don't like to mess with them, as we have to use booster transformers.