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Old 2nd September 2003, 04:16 PM   #1
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Default 6DJ8 Tubes

Inside my X-Can v2 Headphone Amp there are two 6DJ8 Tubes. I noticed that there is no "Brand" name on them at all. Is there any possible way of knowing what brand name they are?

I've also found out that the 6DJ8's can be replaced with 6922's.

Would 6922's be a better replacement or should I stick with 6DJ8's?

Lastly; Any replacement suggestions would be appreciated. Thanks.

Tom
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Old 2nd September 2003, 04:43 PM   #2
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Default replacement

For low cost and excellent sonics, the JJ6922s are pretty good.
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Old 2nd September 2003, 05:38 PM   #3
SY is offline SY  United States
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If you're really, really lucky, you might stumble across some NOS 6KN8 or CCa.
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Old 2nd September 2003, 08:01 PM   #4
DSummer is offline DSummer  United States
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Default 6DJ8...

You can use 6922, 7308, 6ES8, ECC88, E88CC, E188CC, ECC189, CCa, CV2492, CV2493...
If you need any specific type of 6DJ8, you can email me, may be I can help. I have quite a lot of NOS on hand.
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Old 2nd September 2003, 08:23 PM   #5
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Default Re: 6DJ8...

Quote:
Originally posted by DSummer
You can use 6922, 7308, 6ES8, ECC88, E88CC, E188CC, ECC189, CCa, CV2492, CV2493...
If you need any specific type of 6DJ8, you can email me, may be I can help. I have quite a lot of NOS on hand.
Thanks. I actually am not having problems with the amp at this time, nor do I feel I need to replace them right now.

But; I just want to know and be ready when replacement time does come around.

From the Tube numbers that you show; would any of them be more suitable or of better quality than the 6DJ8's? Or does it not matter that much? Thanks.
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Old 2nd September 2003, 08:40 PM   #6
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Hi,

Quote:
If you're really, really lucky, you might stumble across some NOS 6KN8 or CCa.
While I know the Cca to be one of the best sounding of the entire 6DJ8 family, I never had the occasion to investigate the 6KN8.

Since you mention it here, I assume it's a particularly good sounding tube or has it technical features I'm unaware of?

Quote:
You can use 6922, 7308, 6ES8, ECC88, E88CC, E188CC, ECC189, CCa, CV2492, CV2493...
ECCC189/6ES8 are vari- tubes, not really suitable...same goes for the ECC89.

If it were for preamp use use I'd pick the Cca for sound or the E188CC/7308 for lowest noise.

The NOS Philips and daughter company tubes are good sounding ones; these include:

Adzam (Phi Belgium)

Mazda (Phi, France)

Valvo (Phi, Germany)

Mullard (Phi, Uk)

And a bunch of others.

I also like the NOS TESLA E88CC alot which were based on the TFK data and build using the old TFK tooling.

I don't particularly like the Sovtek 6922s which are rather metallic sounding.
The plain NOS Russian ECC88 are alot better.

Any Chinese built ECC88 sounds totally odd to me as does most of their range.

Cheers,
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Old 2nd September 2003, 09:05 PM   #7
SY is offline SY  United States
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Avoid the 6ES8; the remote-cutoff characteristic renders it HIGHLY nonlinear.

Frank: The 6KN8 has a higher mu (45), really low noise, low microphonics, and better linearity in the circuits in which I've used it. Just remember, if you find any, I get my cut!
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Old 2nd September 2003, 09:06 PM   #8
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Forgot one Question: About "Tube Life"?

If I used this Amp 3-4 hours a day and it was "Off" 19-20 hours a day; are we talking a few years lifespan, more/less possibly?
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Old 2nd September 2003, 09:23 PM   #9
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Default tube life

It depends alot on how hard the tube is run. I have seen these tubes last for years upon years. On the other hand, if they are run near their maximum ratings their life will be shortened accordingly.

Hope this helps, at least some.
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Old 2nd September 2003, 09:53 PM   #10
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Hi,

Quote:
Just remember, if you find any, I get my cut!
Cross my heart.

Silly thing is I used to have some stock of those, maybe half a dozen or so...

At that time they were just meaningless HF tubes so I just sold them for a few bucks...guess I should have as they seem to catch 25$/EA nowadays.

That's life...

Thanks for the tip anyway, SY.

Quote:
If I used this Amp 3-4 hours a day and it was "Off" 19-20 hours a day; are we talking a few years lifespan, more/less possibly?
Don't worry that tube will last for ages if you use it conservatively.
If you push it close to its limits just replace every two years as Steve suggests.

Having a good tubetester will tell you more about its condition.

Cheers,
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