View attachment 132697
I guess the name is like a Wizard of Oz reference or something.
This may explain some of the test results. Especially the bad cross talk. Look at the right side, the green wires between the inputs and the white selector, are not shielded and placed in close proximity in parallel. Definitely not a good practice of design. I would suspect that the idea is of
someone who's understanding in basic Analog design simply does not exist. A disaster is written all over it.
In overall, I see two power supplies (eBay?) that are hard wired to the AC. The "GND plate" is the bare wire connected between the two. 4 GND
green wires are going to 3 PCB's kind of VERY LOW TECH home made. On the middle PCB there is a TO220 (black case with 3 legs), most likely a
DC regulator, that is soldered very poorly. No QA of a major firm would approve this or any of the catastrophic design.
This can explain well, why it's better to have a top caver.
I would like this design better:
The inputs are connected to a PCB directly. The input selector is on the same board, and the knob is using a long metal bar to do the journey inside: No wires. No cross talk.
I'm not a big fun of tubes, and I like more designs that a separation wall is placed between the Amp and PS, This is an analog PS. The "Truth Pre Amp " Ps is a switching PS!
As for the name, what is the truth in this pre-Amp., to deserve such a neam?
I think that the name: "deception" or lie would fit the product better.