• 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.

UY-224 or 24 etc

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nafunga

Member
Joined 2005
#1
Really for anyone in the U.S who may have found a use for this early tetrode. The spec sheet advises (RC coupled amp) a 250v ht supply with RL around 150K, bias at -1v with 25v on the S.G (which appears rather low compared with more common 90v in other applications) I am aware that tetrodes of this type are not usually recommended for audio but,anyone used them please?

David W (UK)
 
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