kevin gilmore

i'm think there is something wrong with the frame. you can keep putting bearings in, but they will continue to die.

at 1kv, into cold tubes when the turn on delay is not working, yep lots of plasma that said, the T2 (both of them) can eat input tubes real easily especially when you put fake siemens tubes in there

switching half the lines is not the main problem. the main problem is that dc on the input with an unbalanced input will generate differential dc on the output which the epsilon 12 will not detect.

I made them as gerber version 2, that is what everyone seems to want to use these days. no idea which polygon or layer... here it is as rs274x staxt2powershrunk - CADCAM.ZIP

measure the bias wire from stax jack to stax jack. Had better be 10 meg (5M x 2). Anything else and the thing is not good for the headphones.

Justin and birgir sell stax sockets.

On the t2 and diyt2 the front end tube filaments are referenced to ground with resistors

8.7sp3 I have 8.8sp0 but many things have changed and its not backward compatible, so have not installed it yet.

definitely. ratsnest mode in proteus. makes things much easier when you have to make changes to something that works.

the power board I posted is the original board designed to fit into the vertical fin chassis. my original design for the t2. the other boards were done by joamat. sure looks like they will fit into that chassis.

I did the same thing machining from aluminum, the 2 bends for all the heatsink mounted transistors. impossible otherwise. here is a version of the shrunk amplifier board that has been netlisted and teardrop'd. someone would have to check this carefully before making boards. updated file, I think I got them all. t2shrunknet - CADCAM.ZIP staxt2powershrunknet - CADCAM.ZIP

The latest gerber files posted above are the same as I sent to kytuphicanh missing trace fixed, rounded corners and gerber v2. It would take a whole bunch of time to netlist the board which would allow filleting. Current board works, so I will leave it alone.

updated shrunk board files with missing trace fixed and rounded corners staxt2powershrunk.ZIP t2shrunk.ZIP

if they used dermabond to glue you back together, most of that will disappear. If they sewed you up, it will look that way for a very long time.

I think I sold the complete chassis with angle brackets and board set for $1295, but I was not making any money. (no sand) one more for posterity. Really like this one, definitely takes talent to do this.

reposted for posterity. Any person that would do this and think they can assemble a T2 probably should reconsider.

I don't know who that is, but the angle brackets are nowhere in any of those pictures. Almost impossible to build without the angle brackets. and brazilnut is aka hennyo aka dude5OO aka becky aka rebecca aka... so I would not put much value in what he says.

so here are 2 pictures of the screw being arc'd material from the screw is missing and the plastic is melted These are from the T2 power supply and the voltage was close to 600V

I do have a picture of the t2 arcing, it was thru the screw to the center hole. After that most of us switched to ceramic and peek or similar screws. It's actually only 350v in this case, B+ to ground.but still, likes to arc. The thicker silpads without holes and spring clips also work but you have to drill extra holes in the heatsinks. 5.1k. Rn60d resistors is what most people use. i forgot about the bias line, should be 4.7M (or 5M) rn60d. Required for sr007,sr009 i might be able to add the 5.1k resistors to the board

The intent was to attach the board to the side with the heatsinks vertical using these or similar. Board down, or Board up, really does not matter. http://www.newark.com/ettinger/14-86-313/mounting-bracket-steel-enclosures/dp/59M4493?ost=14.86.313&ddkey=http%3Aen-US%2FElement14_US%2Fsearch

then you need to lower the resistance of r11 even further.

something is wrong, with .85ma and 300v, should be 240 volts that is only 20 volts now to B+, the stage is likely to clip

Same pinout so they should work

feedback is absolutely not going to work, need resistors between cathodes and R3. But then the gain goes down And then you need C2. And there is not enough voltage gain to begin with.

here are both of them, not sure which one was in the group buy 3) Its a current mirror. So output voltage depends on impedance, currently 1100 ohms. Needs an output buffer if you are going to use it for a preamp.