NOTE: Our friend Walter KA4KXX checked and found that indeed, Eric is a ham! He is KK6GZM. FB!
Here is what Gemini has to say about this:
On the CuriousMarc YouTube channel, Eric is Eric Schlaepfer, a highly skilled hardware engineer and hardware reverse-engineering expert who frequently collaborates on the channel's most complex vintage electronics restorations.
Online and on social media, he is widely known by his handle, TubeTime (@TubeTimeUS).
When Marc and the team hit an incredibly stubborn digital or silicon-level roadblock, Eric is often the "reinforcement" they call in.
A few things he is best known for on the channel and in the broader electronics community include:
Deep-Dive Troubleshooting: He famously helped Marc debug a dead IBM PS/2 Model 77 computer by hookup up a logic analyzer and using Ghidra software to reverse-engineer the custom BIOS down to the binary level, successfully tracking down a deeply hidden motherboard ASIC failure.
The Open Circuits Book: Eric co-authored the popular book Open Circuits: The Inner Beauty of Electronic Components (with Windell Oskay of Evil Mad Scientist Laboratories).
On CuriousMarc, he has featured cross-section videos where he literally slices electronic components—like old resistors, capacitors, and ICs—perfectly in half and polishes them to reveal their intricate internal engineering under a microscope. The MOnSter6502: Outside of the channel, he is famous in the retro-computing world for designing and building a fully functional, giant-sized MOS 6502 processor made entirely out of thousands of discrete, individual transistors and surface-mount LEDs so you can visually watch the data flow through the registers.
Whenever Eric shows up in the lab next to Marc, Carl Claunch, and Ken Shirriff, you know the video is about to dive deep into microscopic component analysis, logic analysis, or advanced circuit reverse-engineering.
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Here is the CuriousMarc video about the bad French resistor:
https://www.youtube.com/watch?v=z2UXwW55kAI
Here is the cover of the book:
