1x Mullard Z729 = EF86 O-getter G. E. C. Label Mitcham 1961 8Y0 Strong

1x Mullard Z729 = EF86 O-getter G. E. C. Label Mitcham 1961 8Y0 Strong
1x Mullard Z729 = EF86 O-getter G. E. C. Label Mitcham 1961 8Y0 Strong
1x Mullard Z729 = EF86 O-getter G. E. C. Label Mitcham 1961 8Y0 Strong
1x Mullard Z729 = EF86 O-getter G. E. C. Label Mitcham 1961 8Y0 Strong
1x Mullard Z729 = EF86 O-getter G. E. C. Label Mitcham 1961 8Y0 Strong
1x Mullard Z729 = EF86 O-getter G. E. C. Label Mitcham 1961 8Y0 Strong
1x Mullard Z729 = EF86 O-getter G. E. C. Label Mitcham 1961 8Y0 Strong

1x Mullard Z729 = EF86 O-getter G. E. C. Label Mitcham 1961 8Y0 Strong

Model: Mullard Z729 EF86 (Made in United Kingdom). Lush and warm vintage tone, intimate vocals, wide sound stage with layered details. Date code(s): BY0 R1? 4 (BY0 = EF86, R = Mitcham, 1 = 1961, 4 = Week 4 of production month).

GM (Mutual Conductance) test result : 88% of NOS. Packaging : NEW white tube boxes. This set was tested and certified by RoeTest V11 Professional Tube Testing System with the following result. Measured transconductance(GM): 1.76 mA/V - 88% (100% = 2.00 mA/V).

Measured plate current(IA): 2.725 mA - 91% (100% = 3 mA). NO shorts, leakage or gas. Curve trace is also included in the original RoeTest report.


1x Mullard Z729 = EF86 O-getter G. E. C. Label Mitcham 1961 8Y0 Strong