This is a very well known audio output beam tetrode valve. The figures given are for single ended use, but a pair run in ultra linear AB2 push pull will deliver 50 watts with 2% distortion. It is not uncommon to find these valves used in parallel push pull. Here each single valve of the push pull pair is replaced with two valves connected in parallel. A 100W amplifier results.
The shape of the envelope is a mixture of the classic shape and the wide tube. Due to the metalisation on the inner of the envelope the electrode structure is obscured.
The main envelope diameter is 48 mm and excluding pins the valve has an overall length of 113 mm.
Part Number: KT66
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