New old stock vintage British Mullard made ECC91 CV4031 tubes. The tubes are new old stock and mostly in military boxes.
Offers on this item considered for quantity 50 or more. CV4031 is a miniature 7 pin dual triode interchangeable with ECC91 and 6J6/6J6WA, for more data please see:
This item is shipped from Britain, in North America or Asia please allow 2 to 3 weeks for delivery.