Thanks for your mini review. I couldn't find many opinions  appart from yours on these monitors since they are a very new model. Do you have the BX5 d2 as well to do some comparison?

Quote: Thanks for your answer. I did suspect that since Galaxy note has the same infamous yamaha DAC than Galaxy SII but on gsmarena they say "note has excellent audio output" or something like that. So I wondered if that's really true. Too bad that a device which costs 600$ sounds like...

Many people complain about the low quality dac in galaxy S2. Does the note share the same problem?

If I liked the sound signature of AKG K601, will I love the Shure SRH 940? The reviews made so far suggest both are similar.

I'm a proud owner of these headphones since a year ago and I can't but praise them. I don't understand people who complain about the bass. Definitely these headphones have good bass extension when properly amplified. I use a portable amplifier, mini^3 , nothing exceptional but they can drive the...

Quote:    You have both CTH and CKKIII amps . Which of these do you think would be best for K601 phones?

What a pity! . I 've finished one Mini 3 and  one gamma1+gamma2 and was interested in this amp as my next DIY project. It seems like a step up from Mini 3 yet not very expensive to build and compact. Also I am very intrigued by the tubes , not to mention that they look so cool. Ok, let's wait...

Will these screws fit in the gamma 2 case? :  ...

  Quote: amb, I don't have a camera to take high res pics, but I've made some progress. I've reflowed  U5's pin 22. Since it is connected to U2's out I think it was shorted or something and that provoked U2 to output 0 Volts. Now when gamma 1 and gamma2 are mated together the two...

Quote:   Thanks for your help, I know that without pictures it's hard to say where the problem  may be but right now I  only have my nokia 5800 which makes horrid photos .   I've shorted JP2D(3-2) and in this case gamma1 works with gamma2 mated to it. This apparently points to U1D once...

Quote: What puzzles me is the fact that this only happens when y1 is mated to the y2 board. I've tested y1 alone and when dac and usb sections are connected with wires all test points give the correct values and U1D's pin 7 sends the correct voltage: 4.80 volts or so when USB cable is...

From the gamma 1 thread Quote:  My bad,  I forgot to specify which 5V test points I am refering to. It's the opposite: 5V (VCC) reads 1.38Volts and 5V (VBUS) 4.87V. I used the USB cable only to power the boards. If I connect the wallwart too I get the following voltages: 5V (VBUS) ...

Quote: You are right, this should be moved to the gamma 2 thread. I'm  answering there.

I checked orientation of  the oscillator (the abracon one)  and the mount surface chips.  Also I have replaced U2 and U1 and reflowed  all pins of U4 and U5 (I don't see any obvious bridges) but still nothing. If that helps the voltages I get on the  gamma2 board are:  5V test point : 4.86 V...

Quote: It is fully populated.  I should have installed only the pin headers and receptacles and then test the gamma 1 board but since  gamma 1 works properly when the dac and usb sections are connected with a ribbon cable and all test points read the correct voltages I assume that the...

  Quote: I tested each pin header/receptacle pair and they make contact.   When gamma 2  is not connected U1D's pin 7 reads 5.25V (wallwart , no USB power)  but just as soon as gamma 2 is mated to the gamma 1 board  pin 7 voltage drops to 2.48Volts.

Yesterday I connected the dac and usb sections of gamma 1 with a ribbon cable instead of mating it to the gamma 2 and it works fine with U1D installed. I used both USB and external power and the power multiplexer works as expected , so I guess the problem lies in the gamma 2 module rather than...

Quote: I've measured those resistors and they have the assumed values: R16D = 1.5K, R14D= 47K, R15D = 47K. I did so, took a look at the schematics to figure out what could be wrong , I guess that pin 7 should have the same voltage than pin 6 (4.88V) but for some reason it has only 2.5V...

Quote: I don't know what the problem could be, I have inspected all joints. Also I have replaced U1D once again (probably the last one given that one pad lifted but fortunately I was able to fix it ). I measured voltages directly at U1D 8-7-6-5 pins. I don't have access to the other...

yes, I made sure orientation is right. Another strange behaviour is: sometimes voltage at test points begins with 2.5V and then drops to 0 V, in other ocassions voltage remains at 2.5V.

  Quote: I have replaced U1D but gamma 1 won't work.  5V test pad in the  USB board has 4.9Volts and the other test pads 2.5 Volts only in both the USB board and DAC board. The only way to make it function is shorting JP2D 2-3.

Quote:  May the resistors be the cause behind wrong voltage reads at test points or U1D? Please, read two messages before this one (I edited it).

The fifth band is brown. I used all the parts recommended on the amb page and bought them to Mouser. In the case of 22 ohm resistors I used :270-22-RC.

red-red-black-gold . I guess that this is the right color code for 22 Ohm. I don't know about the gold strip, maybe 1% tolerance? But what drives me nuts is that the DMM measures 68 or so ohms consistently. Ok. I've installed these resistors. Now the gamma 1 won't work unless I short JP2D 2-3...

Values of R1U and R3U are 22 Ohm but I've measured the resistors I bought to Mouser and the DMM reads 68 Ohm . I don't know if this is such a low value that my cheap multimeter can't measure it accurately or Mouser sent me the wrong parts. Can I install these resistors anyways ?