Brimar 12AT7 (ECC81) Halo Getter Valve Tube Tests Good Made in England 4G7/565 See photos for condition. Tests good on Taylor Model 45C valve tester. Triode 1 mutual conductance reading Gm 6.0 Triode 2 mutual conductance reading Gm 6.2 100% factory data in Taylor manual at Gm 5.5 UK shipping with MyHermes Tracked or Royal Mail. International shipping with Royal Mail International Tracked.
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