How do you keep the 2 wires intertwined?

Hey, thanks! I’ve seen that sennheiser connectors have a little vertical groove on the side, but I didn’t see that on these connectors. Have you bought from aliexpress before? How trustworthy are them?

I would like to make my own cable for the HD 6xx but I don't know how the 2pin connector is called in order to search for different models and makers. Do you know a variety of models of those type of connectors and how are they officially called? Also, do you know how the Y splitter (plastic or...

I read in the forums that it doesn't even compare to a full tube amp, but... Will it add something of the tube sound, at least a little bit? Some people even recommend doing this for the price to add some tube sound. Could it be a placebo effect? Off topic: Do you think a Cavalli Tube Hybrid is...

Could I damage my THX AAA 789 adding this FX-AUDIO tube 03 preamp? I’ve read somewhere that the amp is designed to take only 2V through the RCA inputs. Is this correct? Will this preamp provide more than that? Could that damage it in the short or long term? I saw this spec in the product...