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The 0C3 (Russian: 105С5-30) (P/N 154-0002-00) is a 105 V voltage reference tube with an octal base.
Note: The designation is 0C3, the leading zero indicating a tube without a heater, although this is often mis-printed as OC3.
- 0B3/0C3/0D3 data sheet
- 0C3 / 150C3 @ radiomuseum.org