Mullard-manufactured, RCA-branded EL34 Xf2 single halo - 2 matched pairs - NOS Mullard-manufactured, RCA-branded Xf2 single halo EL34. Most tube sellers would call this a matched quad. The pair on the right matched my reference tube at exactly 50 mA each when biased in an amplifier. The pair on the left was matched, but delivered 47.8 mA with the same bias Voltage. Close, but no cigar. They are two matched pairs!
Mullard-manufactured, RCA-branded EL34 Xf2 single halo - 2 matched pairs - NOS Mullard-manufactured, RCA-branded Xf2 single halo EL34. Most tube sellers would call this a matched quad. The pair on the right matched my reference tube at exactly 50 mA each when biased in an amplifier. The pair on the left was matched, but delivered 47.8 mA with the same bias Voltage. Close, but no cigar. They are two matched pairs!
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