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Vintage matched pair (2) Marconi GEC KT66 valves, black base, smoked glass, in excellent condition. Made in Hammersmith, England in the 1950s.

Both test ~130% (Good starts at 65%, NOS ~100%)

1 Month Guarantee - All returns accepted

Tested on a B&K707 dynamic mutual conductance tester for shorts, gas, grid emission and strength. 

Items shipped within 3 working days 1st class registered post