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Melos tube rolling thread - Page 5

post #61 of 137
4/20/02 at 12:54am
Thread Starter 
There should be no problem. The E88CC is the correct tube. Just for completeness, what's the designation on the Sovtek?

Also, is this happening in both channels? If so, it would indicate a tube compatibility issue...but that shouldn't be. If you got the tubes from a dealer, it might be worth talking to him to see if he's got any ideas.
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post #62 of 137
4/20/02 at 1:19am
Ummm, never mind, guys. After further investigation, I found shorted speaker cables on the left channel......no more clipping.....JJ's sound fine ....I'm just a dumb-ass sometimes!

Thanks for all your help.....Sorry for the trouble.
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post #63 of 137
4/20/02 at 1:54am
Don't be dissin' my JJ's. Their E88CC is a very fine current production tube... better than any others out there.
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post #64 of 137
4/20/02 at 2:01am
I agree, Nick...like I said, it was a totally different problem. I'll not dis' the JJ's!........
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post #65 of 137
4/20/02 at 2:01pm
I'm getting mixed messages. Some people say that the JJs are maybe 80% of NOS quality, while others say that they are absolute crap... what do you think?
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post #66 of 137
4/20/02 at 4:46pm
No way... the JJ E88CC is one of the best examples of modern production. It is not better than a vintage Amperex PQ 6922, but not much worse, either. It's a great tube. I hope they keep improving it!
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post #67 of 137
4/20/02 at 5:04pm
Thanks, Nick. I no longer feel like using my JJ E88CCs to poke out my eyes.
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post #68 of 137
4/21/02 at 8:42am
Funny thing happened...
I couldn't sleep so I figured I'd just listen to music and surf the web. Anyways, I turned on the melos and plugged in the cardas at the same time I was reading this post. All of a sudden I noticed that there was something wrong with the sound... it was faint, raw and grainy. Right away I thought it was my Mullards dying on me. I freaked out and started to scour the web for a replacement set. Then it occured to me that the Melos wasn't warmed up yet.
Also, I realized I had some amperex bugle boys for standby. But I am keeping my eyes out on a certain set amperex on ebay at the moment.
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post #69 of 137
4/23/02 at 6:35pm
Quote:
Originally posted by Nick Dangerous
No, that's correct. The E88CC = 6922.
Is the Amperex Bugle Boy "6DJ8 or ECC88" interchangable with this tube?

Any help would be appreciated!

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post #70 of 137
4/23/02 at 6:51pm
Quote:
Originally posted by RickG


Is the Amperex Bugle Boy "6DJ8 or ECC88" interchangable with this tube?

Any help would be appreciated!
European designation of the 6DJ8 is ECC88

Premium version of the 6DJ8 is the 6922 (Euro desig is E88CC)

Ultra version of the 6DJ8 is the 7308 (Euro desig is E188CC)

All are interchangeable and may be used where the 6DJ8 is called for.

Regards!
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post #71 of 137
4/23/02 at 6:55pm
Thanks, Larry..
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post #72 of 137
4/23/02 at 8:43pm
"All are interchangeable and may be used where the 6DJ8 is called for."

I'm not so sure about this. 6922 and 7308 are rated to handle more power than 6dj8. I believe the Melos manual is explicit about the need for 6922's. Most likely result would be reduced life of any 6dj8's you use at a minimum, who knows what else at most (arc'ed tube bursting?). Don't want to be an alarmist, just adding a word of under-informed caution.

markl
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post #73 of 137
4/23/02 at 8:50pm
Thanks for your input too, Mark. Just to be on the safe side, I think I'll stick with the Sovtek's and JJ's in the Melos and use the 6DJ8's in my EMP.

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post #74 of 137
4/23/02 at 9:06pm
Quote:
Originally posted by markl

I'm not so sure about this. 6922 and 7308 are rated to handle more power than 6dj8. I believe the Melos manual is explicit about the need for 6922's. Most likely result would be reduced life of any 6dj8's you use at a minimum, who knows what else at most (arc'ed tube bursting?). Don't want to be an alarmist, just adding a word of under-informed caution.

markl
Ah! I knew you could move up from the 6dj8 without problems, but I didn't think about going the other way.

I thought that the main difference in the tubes was tighter specifications. From one website I have the following descriptions:

6922:
This is one of two premium versions of the 6DJ8 tube. First of all, it is the same tube as the 6DJ8, and will work wherever a 6DJ8 is needed. It has premium features such as low noise, low microphonics, and usually a longer lifespan.

7308:
This is probably the ultra 6DJ8 type tube. It has all of the features of the 6922, but the triode sections are also matched to each other, and the tubes all fit within very tight specifications. Therefore, any 7308 should match any other 7308 within the same brand.

I'm am not saying that there is not a different power handling capability, only that this particular website did not mention it. Perhaps the Melos requires the better quality & longer life tube to perform up to specs??

Larry in Dallas
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post #75 of 137
4/23/02 at 9:20pm
He he. This is why I always try to warn people about the hazards of getting into glass. There are so many ways you can go wrong buying tubes it not even funny.

And I'm not saying this to you condescendingly like some uber-expert. Although I have long since maxed out my curiosity factor regarding tubes!

Tubes require a lot of BORING research. Yes, they can sound fantastic, but they're a lot of trouble.

markl
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