eXStatA Build Thread II

[pabbi1]

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

 

[gilency]

...

 

[gilency]

..

 

[paxeaxe23]

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
 
 
 

 

[pedefede]

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
R141N5294): -9,8V 
Z9 cathode: 21 V
Z14 anode: -20V 
 
V across Z1: 3,99V
V across Z1: 4,04V
 
Anyone got an idea?

 

[pedefede]

Ok - triple-checked the components, and found the error:
I switched the MJE340's and 350's  
 
Dont drink while stuffing in components  ...
 
 

 

[sachu]

bummer dude..

 

[SteveA]

 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
 

 

[padam]

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

 

[pabbi1]

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.  

 

[SteveA]

Pabbi - Thanks for the info. Yes I'm looking forward to hearing it!

Best regards,
Steve

 

[ting.mike]

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.

 

[sachu]

Quote:

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

 

[pabbi1]

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

 

[pertube]

[size=medium]Hi folks,[/size]
[size=medium]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![/size]
[size=medium]Thx[/size]