JoaMat has sent me the board layout, and I'm working on it.

He did not need silkscreens, everyone else is definitely going to need them.

Could do it as 1 board instead of 4.

 

As one board it would be 11.77 x 7.8 inches.  So a bunch smaller than the 16 x 12 of the original

And using 10m90s definitely removes a bunch of parts. And so does the lt1021, although that one

part is probably double the cost of the led's and fet it replaced. Way more stable though.

 

 

As one board it would be 11.77 x 7.8 inches.  So a bunch smaller than the 16 x 12 of the original

And using 10m90s definitely removes a bunch of parts. And so does the lt1021, although that one

part is probably double the cost of the led's and fet it replaced. Way more stable though.

 

Cheers to the sliver of hope that mere mortals may be able to own a T2, at least a higher chance than currently 

suggest you buy as many 2sk79 and 2sk216 as you can, you are still going to need those.

no suitable replacement for those yet.  All the other parts are mouser.

 

http://gilmore.chem.northwestern.edu/t2modified.jpg

 

Getting the power supply to match that physical size going to be just about impossible.

Edited October 11, 201411 yr by kevin gilmore

is 1156 a direct drop in for 1486?

Yes but rated to only 400V compared to the 600V 1486. 

Edited October 11, 201411 yr by spritzer

Thanks Kevin and Joamat for pulling it together for the rest of us mortals

Hey joamat, your boards look fantastic. What method do you use to etch those? Printer toner transfer?

please check for errors

 

http://gilmore.chem.northwestern.edu/t2modified.jpg

Oh crap! I'm feeling the need to build this.

haven't looked closely yet, but you still have some transistors labeled with 2SC3675.

were you thinking of doing this as one or four boards?

Edited October 11, 201411 yr by Kerry

four boards might give a little more flexibility in casing, you can stack the output stage over the front end

 

Might be cheaper to fab four smaller boards as well

Edited October 11, 201411 yr by nopants

I know I will build one. 

I like it a lot.

 

I do prefer the single board layout.

 

Nice one Kevin and Joamat.

here is the schematic

http://gilmore.chem.northwestern.edu/t2schemmodified.pdf

 

hopefully the two match.

Oo, T2 on ebay: http://www.ebay.com/itm/STAX-SRM-T2-SPS-T2-the-amplifier-T2-2-/301344346036?pt=UK_AudioVisualElectronics_HomeAudioHiFi_Headphones&hash=item462985cfb4

10m90s on the board bottom has 120 and 100, top has 300 and 100, schematic has 300 and 200?

correct values are 100 ohms gate, 300 ohms cathode.

 

fingers getting tired after a day of typing.

No worries, easy to gloss over things when porting files around

 

I also don't see any 2sk216 in the battery schematic, but they're on the silkscreen

Pots in parallel with the 510R have no label on the silkscreen.

Is .5W big enough for the 47R heater ground resistors?

Edited October 12, 201411 yr by GrindingThud

Mmmm, very tempting.  Awesome work!  This may be my next project after I finish my KGST. 

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.

Edited October 12, 201411 yr by kevin gilmore

/

Edited November 11, 201510 yr by JoaMat

_{JoeMat, Very nice! use LT1021 to the active battery is good idea.}

 

_{Keven, can you add extra pattern for the solid state input (LSK389 and 2SK170 x2) option?}

 

 

 

Edited October 12, 201411 yr by Inu

/

 

 

Edited November 11, 201510 yr by JoaMat

It would be nice to get Q32 on the main heat sink as well.

It would be nice to get Q32 on the main heat sink as well.

 

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