Telefunken 6DJ8 and 7DJ8’s are a revelation in my BHK preamp.
Bass is so deep that I swear I’ve gained an octave in the lower registers. But it’s tight bass, not flabby.
Detail is great. These are not the most saturated tubes out there but they suit me to a tee.
Some clarification. I have not tried the single-stalk variation that Kevvy sells. These are the frame grid design - https://www.tubemuseum.org/ProductDetails.asp?ProductCode=TELE-7DJ8 - these ones have steel pins, not gold plated.
I have only used the diamond base - avoid the non-diamond which sound a bit brighter and etched. Diamond base ones were made in Ulm, West Germany. Non- Diamond are made by a variety of manufacturers (Siemens and others) with a different sound.
7DJ8 and 6DJ8 offer a subtle variation. Interestingly, the 6DJ8’s are a tad more relaxed than the 7DJ8 which surprised me as I assumed 7DJ8’s would always sound a bit more laid back that a 6DJ8 in the BHK. No hard and fast rules I guess. 6DJ8 is a tad less extended in the bass and a bit more relaxed in the treble. Midrange perhaps a tad sweeter than the 7DJ8 too.
Both amazing tubes if you want a dynamic, engaging tube.
Prices vary - good ones are a bit expensive and getting more so but you can pick up ones with slightly lower testing and poor writing if you look around.
End of rave review…