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The following is taken from a leaflet entitled 'Mullard world series valves for audio equipment' it probably dates from the early 1960s.
When operated in a single-ended output stage, the EL84 can deliver an output of up to 5.7 Watts at 10% total harmonic distortion.
Two EL84's in pentode push-pull yield an output of up to 17 W at 4% distortion. As these figures suggest, this valve makes available the higher peak powers and low distortion required for present day receivers and medium power amplifiers for home listening.
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The above page is taken from Mullard Outlook, February, 1954.
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