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Take off these nuts and desolder the input BNCs, then you are finally in.

50 views18:45

The input stage of this 20Mhz bandwidth scope consists of a simple TL051 JFET input OP amp and a UA733 differential video amplifier. Yes a video amplifier. Amazing.

49 views18:47

Bun's Lab

These old Hamegs suffer from what are now very fragile plastic pieces. The sensitivity vernier potentiometers are connected to the shafts by plastic pieces which cracked on all scopes of this kind that I've seen.

Since I don't own a 3D printer yet, I fixed it with glue and multiple layers of heat shrink to hold it together. It holds, for now.

50 viewsedited 18:52

Bun's Lab

y offset pots also have issues

53 viewsedited 18:53

Bun's Lab

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Oh and the defect in the second channel was just a bad connection

50 views18:54

Bun's Lab

Getting it back together is an even bigger pain in the butt, since you have to align all those buttons and knobs simultaneously.

51 views18:55

Bun's Lab

One Hameg engineer to the other: "we need a variable capacitor here with x pF but the only ones I can source are a bit pricey".
"Oh just twist some wires together, it'll do the trick just fine."

52 views18:57

Bun's Lab

Been working on a new layout for the bench and rewired everything. The two open spaces are for the PC monitor, for which I have to make a custom stand, and a new device that's coming soon.

71 views16:13

Bun's Lab

54 views16:23

Bun's Lab

Separate buttons for the retro PCs, lab PC, network infrastructure, soldering equipment, DSO, isolation Variac

52 views16:23

Bun's Lab

The other bench equipment is on a different outlet

51 views16:23

Bun's Lab

Currently only the left most KVM is hooked up. Don't have enough cables for the rest yet. And also only one PC and a cable harness for PCs under test

99 viewsedited 16:23