kevin gilmore

Otari, Ampex, Studer, and Nagra. Those are really studio machines, and very few made it to homes. A long time ago i had an 8 channel ampex. Took at least 2 people to move it around. Like the Eidiphor i had, it was completely useless and took up way too much space. Very hard to find pre-recorded R2R tapes these days, and the price is silly if you do. So if you are going to be doing live recording you are going to have to get one of the new all digital things with the built in hard drives. And again, not really suitable as a recordable media device for home use.

yep. But things have changed. I'm not sure anyone needs a tape loop anymore. Certainly not for a real tape machine of some kind. And if they do, its unlikely to be balanced. So a full feature preamp these days is a lot different than they were 25 years ago.

The final resistors came in today, and the T2 is now 100% complete, all parts including standoff's mounted, and most of the screws in the chassis... But in the last hour, i got the prototype of the NEW preamp running. First time. Got to lay out the board. Does unbalanced to balanced, and balanced to balanced with no more than .02db error, and FR of DC to 200khz... Desperately need to test with lsj109's... Been a very productive few weeks.

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.