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nos vs new tubes

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    Tube replacements/equivalents

    Have a Unison Research Simply Two. This unit is auto biasing. Replaced the preamp tubes with NOS Amperex 12au7 - fantastic! Need to replace power tubes. Manufacturer says EL34/6CA7. Is a 6CA7-EL a true replacements? Several other EL34 have suffexs too. In another thread, someone used KT-77, a...
    • Dclay1
    • Thread
    • nos vs new tubes tube amp help
    • Replies: 8
    • Forum: Tube Audio
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