NOS Mullard 1768. We believe this to be a gas filled rectifier with double anode.
This is offered as a museum piece only as we do not have the facility to test.
NOS GE 6GK7. Branded 'Engineering Sample' and the tube itself is acid etched CANADA. We are listing this as a 'Collectors piece' as the tube has clearly seen some use.
EEV BT111 UX4 base thyratron. We are listing this valve as a mueseum piece as we are struggling to find any information or specs. Made in England by the English Electronic Valve company.