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SOHA II Builders Thread - Page 93

post #1381 of 1686

hey guys, so a little update.  I am fiddling with the jumpers to see if the heater settings are correct.  But I am getting some strange voltages.  When jumpered for 6.3 V, I am getting 10.97V on the right (damaged) pin 4  and 5.5V on the left pin 4.  when checking the jumper test point I am reading 5.5V.

I can only guess that the 6.3V jumper position isn't working properly  and more of the voltage is going to the right heater.  any suggestions? what would cause the uneven distribution of voltage to the heaters?  thanks!

post #1382 of 1686

IMG_2555.JPG

 

this is what Ive done so far.. I ordered a galaxy case so had to remove the caps and wire them to their points. Im thinking of getting the BOM caps for that position if I can find one in correct height. Also Im missing the c2e cap. I cant find it anywhere.. hificollective sells them here but that means I have to pay £4 for 40p cap.(anyone in Uk has any to spare?)

 

also anyone has any ideas about how to stabilise the c1s?  maybe it might be easier if I wire connect them.?

 

btw c1s are 2 months older than me


Edited by tamu - 6/25/10 at 2:14pm
post #1383 of 1686
Quote:
Originally Posted by tamu View Post

 

also anyone has any ideas about how to stabilise the c1s?  maybe it might be easier if I wire connect them.?

 

btw c1s are 2 months older than me


Usually I put them under the board with shrink tubing and eletrical tape to prevent shorts.
 

post #1384 of 1686

Im pretty much done.. need to solder the last cap and ready to fire..

 

IMG_2563.JPG

post #1385 of 1686

Got a question: my trafo is getting really hot. like I cannot touch it. its happening when nothg is connected.. it measures fine though.. is it normal? my other transformers never gets this hot..

 

Untitled.jpg


Edited by tamu - 6/30/10 at 12:54pm
post #1386 of 1686

crap my secondary is wrong

post #1387 of 1686

so I started checking the test points.. I cannot adjust the current (r10) with p2 trimpots. it doesnt move from 300mv on both sides..

should I just leave it as it is? everything else measures ok.


Edited by tamu - 7/2/10 at 8:13am
post #1388 of 1686

could it be because Im using 4700uf caps in c3&c4?

post #1389 of 1686

If you turned it on with your secondary in series I don't see how much of anything besides the resistors would have survived.

post #1390 of 1686

Nope I didnt.. it wasnt connected to the board.

 

any comments on my r10 measurements?


Edited by tamu - 7/2/10 at 8:26am
post #1391 of 1686

so I kept on with the setup. now I am listening to the amp and the sound is somehow distorted but very low too.. Could the problem be the q6 and q7?

 

Edit:Just checked them and q6 and 7s are reading wrong.. I'll change them and see what happens


Edited by tamu - 7/2/10 at 11:16am
post #1392 of 1686

Would anyone be willing to give their opinion on how this amp and the DT990 600 sound together. I understand that tubes will have a great influence on this symmetry. I am looking toward an amp for these cans and would prefer diy, also looking at the BIJOU, as I would prefer a tube amp.

post #1393 of 1686


For 600 ohm phones the Bijou is the king,  use 80uf-to 100uf motor run oil output caps and you will have an amp that can't be beat.  The SOHAII is a great amp for Grados but for 600 ohm cans I go to the Bijou as it fits them like a glove.  If you buy a PAR Metals enclosure the Bijou is actually a very easy build,  I found it went together quicker than my SohaII.
 

Quote:
Originally Posted by METhomas View Post

Would anyone be willing to give their opinion on how this amp and the DT990 600 sound together. I understand that tubes will have a great influence on this symmetry. I am looking toward an amp for these cans and would prefer diy, also looking at the BIJOU, as I would prefer a tube amp.

post #1394 of 1686
Quote:
Originally Posted by regal View Post


For 600 ohm phones the Bijou is the king,  use 80uf-to 100uf motor run oil output caps and you will have an amp that can't be beat.  The SOHAII is a great amp for Grados but for 600 ohm cans I go to the Bijou as it fits them like a glove.  If you buy a PAR Metals enclosure the Bijou is actually a very easy build,  I found it went together quicker than my SohaII.
 


 


Have you tried the bijou with any 600 ohm beyers?

post #1395 of 1686



No they were 600 ohm AKG,  but the amp is famous for mating well to high impedance phones especially with the oil output caps

Quote:
Originally Posted by nullstring View Post




Have you tried the bijou with any 600 ohm beyers?

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