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The ultimate DIY? A Stax SRM-T2!

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  • I finally got the last plate machined.  I had to replace the spindle on my CNC and also made a mistake on the CAD so had to redo this plate, but it's looking great now.  

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The panel is .25 thick just like the real stuff.

Some of the stax plugs are a bit larger than 18mm, so if i recess it

then i have to machine a donut around it.

Will try with the O2 plug later.

The pins in the stax jack are already recessed about .05

Some of the stax plugs are a bit larger than 18mm, so if i recess it

then i have to machine a donut around it.

Will try with the O2 plug later.

I asked this question in the Stax thread, trying to do my panel with Marc's jacks...... apparently, the biggest Stax plugs are 18.5mm in diameter.

original omega connectors and the stax extension cable are both 19.25 mm

my original O2's are 18.88 mm

the sr-003's i have are 18.93 mm

Well somebody's calipers are out...... :)

I'll increase the size of my cutout a bit regardless, just to be safe.

  • Author

I just measured my O2 (replaced the cable last year) and it is 18.53mm

Maybe Kevin is including the bulge of the keyway?

Maybe Kevin is including the bulge of the keyway?

Nope. Although that measures about .5mm

Isn't a 5 digit digital mitutoyo digimatic a standard part of everyone's computer

desk?? I have 3 on mine (different sizes) Plus a digital micrometer...

Gah! Lack of consensus is bad for Stax noobs like me......

  • Author

The Stax connectors are molded so there will always be some margin of error.

My o2mk1, sre-725, and sr-404 all measure about 18.54mm.

Nope. Although that measures about .5mm

Isn't a 5 digit digital mitutoyo digimatic a standard part of everyone's computer

desk?? I have 3 on mine (different sizes) Plus a digital micrometer...

I'm using the same caliper on my SR-003s and get the same number. FWIW.

  • 2 weeks later...
  • Author

p1000034u.th.jpg

Glad that's over... :D There are some errors in the BOM though, at least version 4 which I have.

Nice job Birgir!

I'm in awe. Red is cool :cool:

Anybody close to firing this up yet?

  • Author

Red is indeed very cool. :cool: Kevin should be the first to fire it up and I probably won't be far behind.

As for the BOM errors, there are no 6K8 resistors, instead there should be four 6k2's. The BOM listed 8*390K but you really need 12. You also require at least four more 10K units, probably more. Since it is such a common value it's a good idea to have some extra.

I also matched the 22K resistors and interestingly none of them were over 22K. You need four matched as close as possible to 22K for the "zener" section.

Hopefully the parts i'm receiving this week will complete the amplifier chassis.

Still missing a number of parts on backorder for the power supply.

  • Author

I got an email today from Mouser and the last of the parts should be in stock in April.

A long time but better then the late July date in the last estimation... :palm:

I got an email today from Mouser and the last of the parts should be in stock in April.

A long time but better then the late July date in the last estimation... :palm:

What brand are those pretty red resistors?

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