Specific Models
VR tubes were given part numbers similar to those used for vacuum tubes. Because there was no heater (filament) in the tubes, the part numbers began with "0" (zero). VR tubes were only available in certain voltages. Common models were
Octal-based tubes, 5–40 mA current:
- 0A3 – 75 volts
- 0B3 – 90 volts
- 0C3 – 105 volts (best regulation of these four)
- 0D3 – 150 volts
Miniature tubes, 5–30 mA current:
- 0A2 – 150 volts
- 0B2 – 108 volts (best regulation of these three)
- 0C2 – 72 volts
Miniature tubes, 1–10 mA current:
- 85A2 – 85 volts(equivalents:CV449,CV4048,QS1209,QS83/3 )
Voltage reference 1.5–3.0 mA current:
- 5651 – 87 volts (the most popular voltage reference ever made)
- 5651-a – 85.5 volts
Subminiature tubes:
- Various models that resembled neon lamps, but were optimized for more-accurate voltage regulation
Read more about this topic: Voltage-regulator Tube
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