I found an old DIY amplifier that I would like to use, but I ran into a problem: I don't know what kind of connector it has. I know for sure that this device is an amplifier, since I once used it and I even vaguely remember the appearance of the connector (it looked like a jack), but about 10 years have passed, and I can’t remember more.
I remembered that the connectors for this amplifier were short (like jack 2.5) and only with 2 pins (TS). Unfortunately, I don’t have 2.5 connectors on my hands, but it looks like they need more than 2.5 sizes. The 3.5 connector is only slightly larger than the connector on amplifer.
I was surprised by the connectors on the front panel - they are wider than the 3.5 jack (it dangles there), besides, they are too shallow for 3.5 and do not fix the plug. I don't need them, but it would be interesting to find out about them too.