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I am new to tubes.
I read Joe's Tube Lore.
In the article he says RCA did not make any 6DJ8 Tubes.
Can anyone help me to find out just who did make these?
They have the ridged tops, and say made in Great Britain.here is a link to the auction that I won them on.
Thanks,
Rick
Follow Ups:
A good sub
I picked up a couple of these two weeks ago on Epay. The price was extremely reasonable (delivered for $7.50 ea.). Using one now in line position of my Counterpoint SA3000. Indeed, a very nice tube. A bit more forward than the D getter bugle boy that preceded it. Still in process of retuning things up and down stream to optimize the presentation.
Rick7,The tubes on the Ebay listing photo look from a distance like mid-1970's Philips-made ECC88 with the dimpled disc getter.
Identification is alsways complicated with tubes from Philips factories as pretty much the same tubes would be made all over. If these are what they appear to be and were called "Amperex", they'd be "orange globe" labelled. The Valvo version would be teh plain white label. These same tubes might have been labelled Mullard IEC, but I'm not sure. The blocky white lettering resembles the Mullard IEC style.
Philps used the same designs/ tooling in Heerlen, HOlland, Hamburg -as Valvo- and it's entirely possible that your new tubes were made in England in the Mullard, Blackburn factory.
The key will be to look at the tiny date code etched in the bottle. The first character of the second group is a "B", then these came form Mullard, Blackburn.
The complication is that, as time went on, RCA seems to have been taking tubes from whomever was left. I have RCA 12AX7s that are really East German RFTs, but labelled "Made in G.B".
I could be mistaken in the identification as the photo is a bit far off, but if those are the dimpled disc getter Philips from the mid-70's, they are suprising nice- not the Amperex Bugle Boy, but in the same spirit.
The whole story can be revealed in five seconds when you see if and what the etched codes say.
But, if these measure as nicely as advertised, and are the Philips, the $35 for 4 is a very good deal.
Cheers,
Thanks for the help.
Here are some numbers I found.7722 - in red by the RCA label
GAO - in small white
B6U1 - in small white under the GAO
K 13 - on the bottom in the center and by the pins.1630
GAO
B6D2
V 107643
GAO
B6G1
N 107648
GAO
B6G1
C 10I don't know exactly what a "Dimpled Getter" is - but I think that would be a good name for what I am looking at.
Does that help narrow it down?
I ask, because I have been offered some Amperex PQ's and if these are Amperex's anyway, I will pass on the offer.Is there anywhere to test the tubes? I am in L.A. CA. I am sure there is someplace.
Thanks,
Rick
Amperex never made 6DJ8/ECC88 types labeled PQ. That was reserved for the premium 6922/E88CC only.
Yes, I know.
I should have said I was offered Amperex 6922 PQ's. I bought RCA 6DJ8's.
Rick,Well, the "B6G1" tells the story and these were made in 1971 at the Mullard Blackburn factory. These would be the same as the plain Amperex orange globe of the same year, and should be quite OK sounding.
The Amperex PQ, if they have a halo getter and are earlier Heerlen tubes, though will be slightly, but noticeably better. Perhaps you can use a couple of PQ for the first position or phono tubes and the dimpled disc ones down the line a bit.
As for tube testing L.A., I really don't know where to do it. I live in Woodland Hills, and if I could trust my EICO 666 tester, you'd be welcome to use it, however, it has a quirk and the the same tube can measure wildly differently. I think there's an intermmitent weak capacitor. You might call the boutiques that sell tube gear- Brooks Berdan, Upscale Audio < and they sell tubes too, and ask for suggestions.
Cheers,Bambi B
GA= 6DJ8
0= Revision 0
B= Blackburn factory
6G= July 1976
1= 1st week of JulyIn the Amperex code scheme, the 6 could also be 1966 or 1956 however, the dimple getter with A frame first appeared in the 70s.
I do not think it could be 56 or 66 as the 4 digit code did not come in until the mid 60's. That is what I have been told so 76 more than likely.
OLLY
The glass height and shape, the getter flash size, the "ridged" top, the A frame, and the getter design suggests to me you got Amperex 6DJ8. These weren't made in the UK, so the prints are probably in error (not surprising since these are rebranded tubes).
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