Philips (Mullard) EL34 - Xf4
We have a small batch of NOS Mullard made Xf4 EL34 tubes. These legendary tubes were made at the Blackburn factory in Great Britain during the 1960s. They were packaged for Philips and are in original boxes. The logos marked on the tubes were for their French subsidiary RTC (Radiotechnique). The construction details include stapled plates and a single "halo" getter.
From Vacuum Tube Valley: "An excellent sounding tube with outstanding performance in our system. Dynamic range and frequency extension were exceptional and all other categories were rated as one of the best." They also noted, great frequency extension, musicality, and dimensionality.
EL34 Tube Types 
Other NOS TreasuresWarranty Information and Return Policy
Warranty Period: 3 monthsAll our tubes are guaranteed for 3 months from the date of purchase. (Any exceptions will be noted on that tube's Warranty tab)
If you receive a tube that does not perform to the manufacturer's specifications, please do the following:
- contact us to get a return authorization
- return it via regular mail within 90 days from when we shipped it, and we will provide an exchange or refund of the full purchase price of the tube.
Returns not related to warranty or defect will be considered at our discretion, and are subject to a 15% restocking fee.
We can not accept returns that don't have an authorization, are past 3 month, or are returned improperly.
These guidelines may be updated without notice.