2 X EF86 TUBE. 1950s PRODUCTION. TESTED IN ROEHRENTEST TUBE TESTER TESTED IN AMPLITREX AT1000 TUBE TESTER.
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RARE: 8Yn Production - Diamond Mark on Bottom. All tubes are tested with the Audiophile in mind for SHORTS, GAS, MUTUAL CONDUCTANCE and NOISE (large tube lots are not tested for noise). AT1000 TESTs as NOS.
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RWN EF86 Vacuum Pentode Tube. The EF86 is a high gain pentode designed to amplify low-level audio signals. Tested on AVO 160 With All our tubes are tested for shorts and gas leak. S = 2.5 mA/V (2.3 = 100 %).
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GEC CV4085 EF86 FINE MESH GOOD QUALITY CHEAPEST ON EBAY BY FAR BOXED PLEASE LOOK AT ALL PICTURES
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MULLARD BLACKBURN FACTORY " B " CODES ETCHED INTO THE GLASS. BOTH VALVES TESTS 100% STRONG ON MY B&K 747 AND HICKOK TV-7 TUBE TESTERS.
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Valve/Vacuum Tube - AVO Tested Strong. Perfect for Leak TL12's. AVO NOS Specs: IA = 3.0 GM = 2.3. No leaks or shorts / gas, straight shiny pins. Valve 1: A1 3.6 2.6.
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All tubes are tested with the Audiophile in mind for SHORTS, GAS, MUTUAL CONDUCTANCE and NOISE (large tube lots are not tested for noise). AT1000 TESTs as NOS. Here are the desired target numbers for a EF86.
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Tested on an AVO valve tester, with results shown below. These are badged ‘Marconi’, but have the acid etched date codes of Mullard's Blackburn factory which clearly identifies it as a Mullard tube.
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