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Tesla ( Mullard Xf2 copy) NOS matched quad with low hrs on it, these are the original Tesla EL34 that was made famous when Marshall switched from using the Mullard EL34 to the Tesla in the mid 1970s. Made in Czechoslovakia. The valve has a brown base with thick anode plates and rugged construction, Double O getter. They are often sold for $300 for quad.
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