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eXStatA Build Thread II - Page 31

post #451 of 566

You are so almost there... it will be really interesting for you to compare the two amps.

post #452 of 566
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Edited by gilency - 12/9/10 at 12:42am
post #453 of 566
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Edited by gilency - 12/9/10 at 12:40am
post #454 of 566

I find myself in the position that I can't build my Hybrid and don't really see a time soon when I will be able to.

 

Therefore I am offering my Boards and components (including Hammond Transformer and 2 Stax connectors, but no case and no Pot)

 

I live in Germany, so it would probably be easier to post within Europe if anyone outside europe is interested I would have to find out what shipping would cost.

 

PM me for further information, and list of what I have

 

 

Francis

 

 

 

post #455 of 566

Hi All

 

Finally had time to finish my PS and amp modules.But the PS has trouble:

LED:  light at power on

T1-2 can be adjusted to 360mV (and T3-4 to 410mV)

 

+rails: 20,8V

-rail: -19,8V

 

 

everything seems pretty symmetrical:
measurements:

T1: 314V

T3: -318V

Z1 anode: 309V

Z2 cathode: -309V

 

[added 6 jan:]

 

Z3 cathode: 20,4V

Z8 anode: -19,3V

R13 (1N5294): 10,8V

R14:(1N5294): -9,8V 

Z9 cathode: 21 V

Z14 anode: -20V 

 

V across Z1: 3,99V

V across Z1: 4,04V

 

Anyone got an idea?


Edited by pedefede - 1/6/11 at 4:24am
post #456 of 566

Ok - triple-checked the components, and found the error:

I switched the MJE340's and 350's  :(

 

Dont drink while stuffing in components  ...

 

 

post #457 of 566

bummer dude.. :(

post #458 of 566

 I just bought an Exstata from Skullguise (thanks!) and am in the process of purchasing a pair of 407s to mate with it.  Meanwhile, I would like to ensure that I have all the updates for this unit as I understand it has gone through several iterations / stages.  From the mostly crappy photo below, can anyone tell me what vintage this is and what if anything I should do to make it as good as it possbily can be?

 

 

Thanks!

Steve

 

DSCN0043.JPG

post #459 of 566

It is the prototype version (at least I think so, mine looked different), I am not sure if you can upgrade it easily.

post #460 of 566

That is a prototype that I built with the CCS mod, which is all but identical to the current version. Nothing you need to do - except get those phones.   :-)

post #461 of 566
Pabbi - Thanks for the info. Yes I'm looking forward to hearing it!

Best regards,
Steve
post #462 of 566

Hi,

I've assembled the PSU completely using the parts from the BOM. In initial check up, everything measures up correctly to the values that are specified on the Cavalli website. The only issue I have is setting the bias voltage. The bias voltage maxes at around 535V, and it won't go any higher (trimpots are already making clicking noise). Any idea what's wrong?

 

I'm getting +300V and -300V rails, T1-T2 360mV, T3-T4 410mV, T1 and T3 to ground measures ~330V.

 

I'm using the 369JX Hammon travo, which is the universal version of the 269JX.

 

Thanks.

post #463 of 566
Quote:
Originally Posted by pabbi1 View Post

That is a prototype that I built with the CCS mod, which is all but identical to the current version. Nothing you need to do - except get those phones.   :-)



oh right...that pic doesn't hsow the heatsinks hanging off the sides well

post #464 of 566

Nope, you are thinking (perhaps) of my monster power caps on my personal build... here is a better pic of that build:eX_QC.jpg

 

eXbrd.jpg

post #465 of 566

Hi folks,

Today I checked Mouser online for KSC5042 transistors it seem to be an End-of-Life-Product any suggestions for replacement? Can we take KSC5026 - a bit high output capacitance probably!

Thx

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