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Mine arrived today & it's going back. Headphone volume is at max with vol. control at 0. Vol control doesn't change the volume. Seems to work as a unity gain preamp, as the volume control works normally at the RCA outputs. One RCA input jack wasn't tightened & I had to open the back to tighten it. Peeking in, I noticed that the PCB has an awkward bend in it. Looks like the standoffs they used are too short & the tube sockets are bending the board in the middle. I used a flashlight to peek into the holes in the bottom & could see that they didn't bother to clean any of the solder flux off the board. This flux can break down the solder & it becomes a crumbly mess that doesn't conduct any longer. It has to be cleaned out & everything resoldered. Basically you have to remove all the components on the board, remove all the degraded solder, clean the board & resolder all components & hope no other damage was done. I have sent an email to support, so will see what they say. From what I see, I no longer want this thing. It looks like they threw these together to meet the demand of this drop & didn't send them through QC. Think maybe it's because they don't have to honor the warranty? Hmmm.
signed very disappointed
P.S. Here you can see the pcb & how it is warped by the way it's mounted. The standoffs are shorter than the tube sockets. This can't be good for the board & is a sign of very poor workmanship.
How do you send it back and to whom? Mine has clicking in the left channel when music isn't playing. I'm not techie enough to solve this on my own. Which support did you e-mail? Do you mind sharing?
Go to your transactions, find the listing for the amp and then --> 'contact support' --> 'issue with order' --> 'defective/warranty issues'........ That being said, is there a cell phone or wireless router near the amp?? Or are you using your phone as the media player?? If this is your situation you could try moving the wireless device(s) away from the amp. I have also noticed that my older Imac makes a lot of noise from the wireless keyboard/mouse. My solution for that particular noise problem was to use my macbook air as the source.
Swap the tubes. Does the clicking follow the swap? If so, you've got a bad tube. Use a clean cloth when pulling/reseating the tubes.