Originally purchased as a NOS quad.
Mullard Blackburn made xf2's branded Sylvania. Single O getter. Brown base. Hole in center of base.
One tube turned out to be making a soft intermittent noise. Remaining 3 tubes sound fine but one of the tube's centering pins broke off with no damage to sound quality. I have a used xf2 quad I purchased years ago on A'gon which included one tube missing the centering pin. It only requires a bit more concentration when inserting the tube to make sure the pins are correctly orientated in the socket. I think the centering pin can be repaired if the right adhesive is used.
All tubes come with original Sylvania boxes. Some closure flaps are torn or missing.
Date codes for the pair are B8K1 and B8K2. Price 250.00
Date code for single tube broken centering pin is B8K2. Price is 100.00
Date code for noisy tube B8K1. Price is 30.00
Price for all 4 is 350.00.
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All tubes sold as is. No returns.