Seeking help for Whammy Amp

[14071466d]

I recently bought 2 full set of the whammy amp kit. I have no idea why both ended up in the same situation. The first kit sounds very very noisey, like 80% noise and 20% music. I apply quite a lot of "upgraded" audiophile components in the first kit and thought that maybe I have bought the fake components with default. I started to build the second kit which the components are completely from the diystore full kit set. Mysteriously it ends up in the same situation as the first one. I am really confused, and this is why I post this thread.

1.My first idea is my dac are the reason of noise because I test both whammy with that same dac. But it is proved not the sources of noise later on. It works perfectly fine under my speaker and other headphone amp.

2. I have tested every resistor before soldering it on PCB. Only resistor is being checked because I have no idea how to check rest of the components.

3. I solder on both side and I have built few diy design successfully. I dont think it is because of cold solder joints.

4. The +-17V is perfectly measured when I power on the full stuffed pcb.

5. I have double checked every parts is soldered at the correct pad, unless I am conceptly wrong at the very beginning. ( which is the most reasonable explanation why both whammy ended up in same situation. )

I am really confused and sad that everyone seems easily nailed it, except me :*(

 

[Alain Dupont]

Hi,

Would you make a simple modification to the AC wiring, twist the 2 AC wires together and shorten their length.

 

[Signal lost]

I cant see where the inputs are grounded. There should be a connection just behind the volume pot. Not sure if that is the problem.

 

[moe29]

I cant see where the inputs are grounded. There should be a connection just behind the volume pot. Not sure if that is the problem.

i just did a quick look and noticed that too... looks like the ground wire was cut - not soldered to the board.
In the build guide 6L6 even notes: "In this photo the ground wire is mostly hidden by the jacketed cable."
and there's no marking on the PCB...

 

[14071466d]

i just did a quick look and noticed that too... looks like the ground wire was cut - not soldered to the board.
In the build guide 6L6 even notes: "In this photo the ground wire is mostly hidden by the jacketed cable."
and there's no marking on the PCB...

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
This is the reason. 😭 Finally! Thank you so much bro. It works now.

 

[moe29]

Excellent! Enjoy,

 

[Signal lost]

Awesome. We have all been in your shoes. Enjoy