• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

A new fashion tube design!

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bournville

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Joined 2003
....Well, they can't be EL90s anyway, so if they are not EL84s they must be another of the '8*' range - other less common tubes in the range used as audio outputs were EL81s and EL86s.

It may be worth checking the pin connections with these tube specs - EL86s are still available anyway as replacements.
 
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