NOS. Full deep bass with velvety smooth voices and precise clean highs. If your system is thin these would be perfect! I purchased a Dynaco cd player a couple of months back with stock Philip tubes and was stunned when I put these in. Everything opened up and they just churn out the music. They sound so good that you can actually sit back and listen to your music instead of thinking of what you would need next to make your system sound better! They are very involving sounding and let you enjoy the music.
Here what Joe S. of Joe's Tube Lore said about these tubes: "Amperex 6DJ8, Orange globe logo, Holland (shield, steel pins,) Much better than the above tube No comparison in fact. Warm, vibrant, lively, grainless, transparent Amperex sound. Killer tube. Almost as good as my reference Amperex 6922s (coming up soon). I slightly prefer this tube to the best of the Siemens 6DJ8s, 6922s & 7308s." http://www.audioasylum.com/scripts/d.pl?audio/faq/joes-tubes.html#6DJ8
Here's what Brent Jesse say about them: "This "A" frame getter version is becoming increasingly scarce. These very scarce tubes have been carefully selected in matched pairs for use in critical circuits of Tektronix test equipment. All have the Herleen, Holland factory mark and date code. These are said to have lower microphonics, thanks to the heavy, rigid construction of the "A" frame getter support above the plates." http://www.audiotubes.com/6dj8.htm
They were born in Heerlen Holland 1969. Date code delta 9j4 A frame. GM% 85%, 85% AND 85%, 92%
This is the information I received when I purchased them. I had bought several pair to satisfy my curiosty and decided the best fit would be a pair of Mullard tubes so I am passing these on for someone else to enjoy.