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In Reply to: RE: CJ pre tube burn out question posted by Chip647 on April 16, 2016 at 18:14:55
You are correct. Thanks. New (old) Mullards are now in and I have my stereo back.
Those CJ Russian tubes sure lasted a long time (w/ no degradation that I notice, even compared to the ones that I just installed).
They had daily use for > 10 years. I estimate easily >> 10k hours.
The Brimar in my Anthem AMP 2 SE power amp input has gone about as long so far. Actually, I have switched that one once with its mate which just sits there with its heater in series.
Follow Ups:
What tubes are you using in the CJ?
If you are using Mullards they tend to eat tubes up. So using rare tubes would be a waste.
The type that Upscale Audio recommenced (NOS made in GB that he called Mullards I believe) since he also said this pre eats up tubes. But the Russian Electroharmonix from CJ lasted over 10 years, so I don't understand such statements about this eating up tubes.
In any case, I was wrong about sonic degradation on the CJ EH ones since I did notice that cymbals, etc. were not a clean as before.
W/ the Mullards, this is back to normal, but these never have any soundstage depth, so, I expect that I will order a set from CJ. The Mullards also do not sound as lush or romantic as I like; less musical, much less engaging. The only thing that they sound good with is like chamber music strings, but it's more analytical, although with great timbre.
I found that Herbies tube dampers don't seem to help the sound of the Mullards, unlike the ElectroHarmonix.
I hate to say it because I have to take the same advice. but just replace those tubes ever 9-12 months. regardless if they need it or not.
Again, it's hard taking MY OWN advice as well when dealing with a $50 GL 6922!!!!
But as you notice before they get noisy then do gradually start to loose that sparkle.
Also try the gold lions.
charles
Unlike a couple of years ago, they seem to be sounding better now. They may never develop the soundstage depth of the EH tubes - I don't know. But they are becoming more enjoyable and balanced.
Stay with Eh ,the best you can find !
My 2 cents
Sorry sometimes i'am a bit dislessic ....
iwanted to say :stay with the best 12 ax7 eh you can find ;or in
crescent price order :ei 12ax 7 ,Tungsram 12 ax7 (best )
I run a pair of Tungsram 12 ax7 (ecc83)in v1 and v2 position
in my premier 3 since 10 years ;every time i try ei (original
c-j )or Eh > i turn back to Tungsram .
The best new tubes choice :well selected Eh (don't wasre money
in mullard reissue,gold lion or tung sol reissue ):c-j
voiced their old pre on the very plain 12 ax7 you can find
(original ones were Ei )
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