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ECC33Sensibly equivalent¶ to:See also:
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Mullard, in 1949, describe the ECC33 as a high slope, low impedance double triode with low heater consumption, primarily intended for use in flip-flop, scaling and computer circuits. The electrode assembly is considerably smaller than other double triodes of the period.
The twin triodes sitting above the pinch.
The stitched anodes, copper control grid supports and a glimpse of the grid winding top right. There is also a thin internal coating on the glass. The heater wire can be seen to be an insulated coil. This coiled wire would have been wound on a former that was subsequently dissolved away.
The the top mica showing the round cathode tubes and a heat-sink fin attached to one of the control grid supports on each triode.The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 66 mm tall.References: Data-sheet & 1040. Type ECC33 was first introduced in 1949. See also 1949 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |  g1(2) | a(2) | k(2) | g1(1) | a(1) | k(1) | h | h |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | ra | gm | 
| 6.3 | 0.4 | 250 | -4 | 9 | 9,700 | 3.6 |
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Updated August 17, 2023.
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