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DIY Vacuum Tube Oscilloscope
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On the bottom left it is shown next to its accompanying vacuum tube power supply, not a single semiconductor used in the whole setup. Wiring is horrible, and its performance reflects that. But at least it looks nice. Uses a 2" diameter 902 CRT, and is based mostly on a 1945 RCA schematic for this tube.
The CRT only runs at <600V (schematic specifies 577V, mine only runs on ~400V), which is remarkably low for a CRT but it definitely still hurts! Uses two 6SJ7 pentodes for vertical and horizontal amplification with a Type 884 thyratron for sawtooth generation. Has x-y mode and internal/line/external sync. Rectification is done with a Type 80 for B+ and a 6AU4 for the negative CRT supply (grounded anode).
The tube could maybe use some magnetic shielding and I am trying to figure that out, but for now I just keep the power supply away from it to eliminate the interference. Whole thing uses a little over 60W when running and is fused accordingly.
This is by far my highest-effort electronics project ever, and I am very glad to be done with it! I started this project over a year ago, before I got my real oscilloscope, and sort of put it on the back burner since then. Whadaya think?
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On the bottom left it is shown next to its accompanying vacuum tube power supply, not a single semiconductor used in the whole setup. Wiring is horrible, and its performance reflects that. But at least it looks nice. Uses a 2" diameter 902 CRT, and is based [i]mostly[/i] on a 1945 RCA schematic for this tube.
The CRT only runs at <600V (schematic specifies 577V, mine only runs on ~400V), which is remarkably low for a CRT but it definitely still hurts! Uses two 6SJ7 pentodes for vertical and horizontal amplification with a Type 884 thyratron for sawtooth generation. Has x-y mode and internal/line/external sync. Rectification is done with a Type 80 for B+ and a 6AU4 for the negative CRT supply (grounded anode).
The tube could maybe use some magnetic shielding and I am trying to figure that out, but for now I just keep the power supply away from it to eliminate the interference. Whole thing uses a little over 60W when running and is fused accordingly.
This is by far my highest-effort electronics project ever, and I am very glad to be done with it! I started this project over a year ago, before I got my real oscilloscope, and sort of put it on the back burner since then. Whadaya think?
Keywords: Off Topic](albums/userpics/10021/154/normal_Screenshot_2026-06-03_134449.png "Click to view full size image
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DIY Vacuum Tube Oscilloscope
On the bottom left it is shown next to its accompanying vacuum tube power supply, not a single semiconductor used in the whole setup. Wiring is horrible, and its performance reflects that. But at least it looks nice. Uses a 2\" diameter 902 CRT, and is based [i]mostly[/i] on a 1945 RCA schematic for this tube.
The CRT only runs at <600V (schematic specifies 577V, mine only runs on ~400V), which is remarkably low for a CRT but it definitely still hurts! Uses two 6SJ7 pentodes for vertical and horizontal amplification with a Type 884 thyratron for sawtooth generation. Has x-y mode and internal/line/external sync. Rectification is done with a Type 80 for B+ and a 6AU4 for the negative CRT supply (grounded anode).
The tube could maybe use some magnetic shielding and I am trying to figure that out, but for now I just keep the power supply away from it to eliminate the interference. Whole thing uses a little over 60W when running and is fused accordingly.
This is by far my highest-effort electronics project ever, and I am very glad to be done with it! I started this project over a year ago, before I got my real oscilloscope, and sort of put it on the back burner since then. Whadaya think?
Keywords: Off Topic")
