For sale a matched pair of Mullard ecc83 tubes made in 1957 at Blackburn factory, same acid codes f91 B7K

Close matched pair tested very strong above average new values:

3,5/3,3  ---  3,4/3,5  (2,5=100%)

Also tested for noise, gas and microphonics

Registered priority postage: EU 8€, rest of the world 18€

any question just ask