There are 42 circuit schematics available in this category. Click here for all circuit diagrams. The Last circuit was added on Saturday, January 28, 2023.Please note some adblockers will suppress the schematics as well as the advertisement so please disable if the schematic list is empty.

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CircuitCategoryDate AddedOK?Votes 
Two Valve 40m CW TransmitterTube Status1 vote up vote down
One Valve CW transmitterTube Status0 vote up vote down
Passive grid (tube based) linear amplifierTubeJun 19, 2024Status0 vote up vote down
ATmega48 based Nixie ClockTubeMar 27, 2024Status0 vote up vote down
Headphone amplifier based on 12AX7 tubesTube Status-1 vote up vote down
Two nixie display clockTube Status1 vote up vote down
VFD (vacuum flourescent display) clockTube Status0 vote up vote down
Single-digit Nixie clockTube Status0 vote up vote down
Oscilloscope CRT ClockTube Status0 vote up vote down
Eight simple power supplies for your workbench (mainly vacuum tube based)TubeApr 10, 2024Status0 vote up vote down
Vacuum Tube Grid Leak Detector: Needs an AmplifierTubeApr 10, 2024Status0 vote up vote down
Vacuum Tube Plate Detector: Needs an AmplifierTubeApr 10, 2024Status1 vote up vote down
Tube amplifierTubeAug 14, 2024Status-2 vote up vote down
Various tube crossover circuitsTubeJan 31, 2025Status0 vote up vote down
Dekatron circuit diagram - device used for dividing by 10 during the valve eraTubeOct 25, 2024Status0 vote up vote down
Miniscope - simple all-valve 1-inch CRT oscilloscopeTubeOct 25, 2024Status1 vote up vote down
Giant nixie clock circuit diagramTubeAug 18, 2024Status0 vote up vote down
TinyScope - simple all-valve 1-inch CRT oscilloscopeTubeOct 25, 2024Status0 vote up vote down
Ice Tube Clock - Vacuum fluorescent display (VFD) clockTubeOct 12, 2024Status0 vote up vote down
DCF77 PIC16F84A Single-Nixie clock (DCF77 is the name of a German radio station on 77.5 KHz)TubeJun 27, 2024Status0 vote up vote down
Closer look at the FET booster based on a vintage Fender 12AX7 input stage.Tube Status-1 vote up vote down
Tube Screamer-based overdrive. Schematic and PCB/perfboard layouts.Tube Status1 vote up vote down
40-30 CW Transmitter (Tube based)TubeMay 19, 2024Status0 vote up vote down
The WB0RIO 6U8A Code Practice OscillatorTubeMay 19, 2024Status0 vote up vote down
The House Finch Direct Conversion Tube ReceiverTubeMay 19, 2024Status-1 vote up vote down
The Little Chickadee 6U8A QRP TransmitterTubeMay 19, 2024Status0 vote up vote down
Magic Eye Tube WavemeterTubeMay 19, 2024Status-1 vote up vote down
WB0RIO Piglet 6U8A Regenerative Receiver (Tube based)TubeMay 19, 2024Status0 vote up vote down
Power Supply for Vacuum Tube ExperimentsTubeMay 19, 2024Status0 vote up vote down
Vacuum Tube B+ Delay CircuitTubeMay 19, 2024Status0 vote up vote down
Hammonator Organ to Guitar Amp Conversion (tube amplifier)TubeSep 07, 2024Status-2 vote up vote down
Liquidator Tube Phaser/Chorus EffectTubeSep 07, 2024Status1 vote up vote down
Vacuum Tube Microphone PreampTubeNov 01, 2024Status0 vote up vote down
5 tubes SSB QRP Transceiver for 20m Ham bandTube Status1 vote up vote down
Nixie clock (PIC16F876)TubeJun 18, 2024Status0 vote up vote down
Homemade scope clock using a DG7 tube and a Microchip PIC16F876Tube Status0 vote up vote down
Five Tube Stereo AmplifierTubeSep 13, 2024Status-1 vote up vote down
FuzzniKator Push-Pull Tube Distortion/Preamp BoxTubeNov 30, 2024Status-1 vote up vote down
High Voltage Power Supply step-up converter using a MC34063 ideal for a geiger counter or nixie tubeTubeJul 03, 2024Status0 vote up vote down
Nixie-Clock using Neon Lamps to form Logic GatesTubeMay 01, 2024Status0 vote up vote down
Power Supply for Battery Valve RadiosTubeOct 16, 2024Status0 vote up vote down
Ultra Simple CRT OscilloscopeTubeOct 22, 2024Status-1 vote up vote down