2 COSSOR Ecc88 6DJ8 Valve Tube Mullard 1961 yellow markings o getter tested

2 COSSOR Ecc88 6DJ8 Valve Tube Mullard 1961 yellow markings o getter tested (image 1/2)
2 COSSOR Ecc88 6DJ8 Valve Tube Mullard 1961 yellow markings o getter tested (image 2/2)
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2 Cossor branded made in 1961 in Mullard Blackburn England factory markings GA1 B1F with good yellow markings. These are some of the earliest ECC88 you will find. Cossor used selected valves made by Mullard in their test equipment. Tested very strong on a TV7 tester. This is a proper hickok design military mutual conductance tester not an emmissions tester like Eico, Jackson etc other different ECC88 and E88CC listed at the moment. have a look at my other items. postage can be combinedmarked ECC88 BVA - ( British Valve association.)
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