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eXStatA Build Thread II - Page 29

post #421 of 566

T1 to ground: 332V

T3 to ground: 326V

High rail: 48V

Low rail: 291V

T1-T2: 360mV. It drifts down slowly a few mV.

T3-T4: 410.

For what is worth, the LED in the high rail looks a little brighter than the low rail.

I changed R15 because it was reading 1.5 instead of 475 ohms. The replacement measured 475 before I soldered it, now reads 1.5 ohms again. why?


Edited by gilency - 11/9/10 at 11:51am
post #422 of 566
Thread Starter 

Measure from the cathode of Z9 to ground.

post #423 of 566

Z9 to ground = 54V

Z14 to ground=203V


Edited by gilency - 11/9/10 at 1:13pm
post #424 of 566
Thread Starter 

First guess is that the z9,z10,z11 string has blown zeners. Try replacing all of them.

post #425 of 566

I replaced Z9, Z10 and Z11.

Still get 48V in the high rail.

All other measurements (low rail,T1 to ground, T3 to ground) are fine.

z9 to ground is 45v.

z14 to ground is 198v


Edited by gilency - 11/9/10 at 1:59pm
post #426 of 566
Thread Starter 

The 198V makes perfect sense given where you are measuring it.

 

We're going to have to replace components one at a time. If you are sure that the zeners are working then the next step is to replace Q9 and Q10.  I don't think that Q5 and Q6 would have been damaged by the two backward zeners, but Q9 might have been and it's just safer to swap out Q10 while you're at it.

 

The mosfet should be ok providing that its protection diode Z1 has the correct orientation.

post #427 of 566
Thread Starter 

While you're at it, what is the voltage from Z3 to ground?

post #428 of 566
Thread Starter 

gilency, how are you doing?

post #429 of 566

Fine, just need to order some parts. Unfortunately it will take a few days for them to ship and I get a few days and have to get back to work. I will let you know when I am able to work on it again.

post #430 of 566

Can somebody point me towards a specific 4PDT switch in Mouser? Thanks

post #431 of 566
Quote:
Originally Posted by gilency View Post

Can somebody point me towards a specific 4PDT switch in Mouser? Thanks


For the inputs it can be a simple On-On switch:

 

http://www.mouser.com/ProductDetail/Mountain-Switch/10TC290/?qs=sGAEpiMZZMvudeGI7i40XMiFOdVKce2XfPMzx0bS%252bxY%3d

 

But, for a few bucks more you can have one of tthe best 4PDT, a TOCOS, from Michael Percy Audio. 

post #432 of 566

OK. Thanks.I am itching to start working on my PS but waiting for parts. 

One more question, How do I wire a loop out? I want to have balanced and SE in with a switch, but would like to have an RCA loop out. 


Edited by gilency - 11/14/10 at 9:59pm
post #433 of 566

You parallel connect the RCA sockets so center pin to center pin to the switch.  With a 4PDT switch you are using common ground so don't worry about that, just connect them all together. 

post #434 of 566

Thank you Spritzer.

post #435 of 566

Finally able to case up my exstata hybrid:

 

674641

 

674643

 

674645

 

This one uses toshiba 2SJ74BL as input jfets, 2sc3676s as output devices. Special thanks to BoilermakerFan for making the parts suggestions!

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