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In Reply to: Re: HP branded Amperex 6DJ8/ ECC88 tubes - Help! posted by kentaja@yahoo.com on September 22, 2004 at 07:19:28:
All of the HP 6DJ8's that I have are coded as "B" for Blackburn, UK, but are also date coded as 70's tubes with A frame and "closed" plates.
Follow Ups:
Yes. I have this tube from the early 70s labeled HP. I can't recall which plant produced the tube. I will check to see if they came from the UK or Holland.Most of the HPs I have are actually Holland produced Bugle Boy types from the mid-60s, or the open plate versions from the late 60s also produced in Holland.
I have a number of the HP labeled tubes that have 78-34 in white as an HP date code and are marked in white Made in USA but with B6L4 in the second row of the etched code.I suspect these were manufactured in 1974 in Blackburn, and perhaps the Blackburn plant continued to make the "closed plate" tubes long after the Harleen plant went to the open plate design.
I also noticed that al of the Harleen manufactured A frame 6DJ8's I have are indeed open plate.
Anyone know how the Blackburn made 6DJ8 sounds?
All these variations, plants, etc., can get confusing!I have many Mullard branded 6DJ8 produced in the UK that are physically identical to the Bugle Boy produced in Holland. These are mid-60s productions. To my ears they sound virtually identical. Any variations in sound are probably Audiophile Induced Delusion on my part than any real sonic difference.
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