12AU7 single tube 0-V-1 receiver with only Vb=12Volts
I made 0-V-2 in my junior high school age about 30 years ago. The line up of them was 6AU6,6AV6,6AR5. In these days I discovered that some kind of tube can be used with only 12 volts on it's plate voltage. See fig.3! I measured the 12AU7 with 12 volts characteristics. With this voltage the maximum plate current become 300 micro Ampere. I made 0-V-1 re-generate receiver with this tube. I could hear the BBC and VOA with a dipole antenna. I could hear the SSB signal of amateur radio by changing the re-generate ratio by the re-generate switch.





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