Greetings x0x citizens.
I think this would be an appropriate thread to post photos and additional information on 3rd party sourced x0x kits that contain defective/counterfeit components so you know what to look for and avoid. Unfortunately most who buy a 3rd party sourced kit from a scammer will probably build it unaware the x0x is full of junk parts. If it doesn't fail on the first power up it most likely will malfunction soon afterwards. A kit builder might assume it was his or her workmanship rather than focus on the banned that they were sold to begin with. Since I'm seeing many wrecked full builds that were kits from the same person, and a wave of new kits to be built with the identical shoddy sourced parts I decided to hold building them until I could do more investigation. I hope this will help some of you. Remember, everything in the following photographs is from the same 3rd party kit source.
The encoder on the left is clearly contaminated and metal surfaces corroded. A junk part if there ever was one. It is the correct height to fit properly through the x0x front panel. The encoder on the right is far too small to fit through the x0x main PCB. The ground lugs and pins do not fit all the way through the x0x main PCB resulting with inadequate solder joints. It also does not clear far enough through the x0x front panel when the unit is fully assembled, so you will not be able to place a control knob on it. Oddly enough this kit usually has the encoder on the right of the photo but for some reason the guy put both of these in the same kit of parts. Not real helpful.
As you can see in this shot the kit source has packed ESD sensitive components- ICs and transistors into plastic sandwich bag material and wrapped them in household tape. This is totally unacceptable. Plastics like this and tape are huge static electricity generators. Sensitive components can be damaged or worse, weakened only to fail later. You might be wondering what's the big deal? Well, let me describe it like this. Ever walk across the carpet in a house and grab a metal object like a door knob only to receive a shock on your fingertips? Maybe you even saw a flash of light when you got zapped. That's more than enough of a voltage to destroy an IC. Anyone handling these parts in a sandwich bag carrying a static charge could ruin them. In addition, the surrounding plastic is likely generating enough of it's own charge to wreck them. When you buy components for a x0x build your parts should be shipped to you in protective packaging like the below photograph. Those parts were purchased from Digikey and Mouser.
These are 10K 1/4watt 5% resistors in the above photo. The four in the top of the picture were part of the 3rd party sourced kit. Look closely at them, you will notice multiple defects in the part's physical body. The leads are discolored, and the fourth one down barely has a color coded orange stripe visible. I suspect these are defective parts that were to be recycled or reclaimed for materials. More than 90% of the resistors in this guy's kits are this bad or worse. I would not use them. The bottom four resistors are brand new. Note the difference in color codes, absence of physical defects, and clean leads.
Here are a couple of 733 transistors for comparison. The top one shows considerable physical wear, all surfaces are degraded and the part markings are very poor. The bottom 733 pictured is a new production Fairchild 733 purchased from DigiKey. All surfaces are sharp and shiny, the part leads are free of discoloration and contamination. The manufacturer's logo is clean and part ID markings clearly visible. I suspect that the top 733 is either a defective part or an outright counterfeit. Either way I would advise against using the top 733 in any x0x full build.