The 6973 is an audio beam tetrode for use in Hi-Fi amplifiers and was designed by RCA in about 1957 - just as stereo amplification was taking off.The 6973 as a push-pull pair operating in Class AB1 was rated at 20 Watts output at 1.5% THD with 350 Volts on the anodes. For a Class A single ended amplifier the anode voltage would be 250 Volts. The figures in the table below are for the Class A use.Robert Coleman says that these were used as a pair driving two KT66s in a Leslie rotating speaker.
The RCA name.The thin glass tube envelope is 21 mm in diameter, and excluding the B9A base pins is 70 mm tall.Reference: Data-sheet. Type 6973 was first introduced in 1957. See also 1957 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |  g2 | nc | g1 | h | h | g1 | k,bp | g2 | a |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | 
| 6.3 | 0.45 | 250 | 250 | -15 | 46.0 | 3.5 | 7,800 | 4.8 |
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Updated January 07, 2022.
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