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Hi everyone,I have a AH njoe tjoeb 4000 with phillips E288CC. This player is on 10 hours / day and play music around 2 hours /day. I do that because I feel it requires a long time to be warm.
So, how long will work ok the tubes ? does the time the player is on but idle "count" as much as the time the player is working ?Thanks for any information,
Christophe
Follow Ups:
The tubes in an Ah! Njoe Tjoeb 4000 have it pretty easy. Most small signal tubes go 5-10k hours in preamps...you may get more than that from the Tjoeb. If those are pricey, try Amperex 7308 which I have found to sound quite similar.There is a standby mode on the Tjoeb that turns off the machine, but leaves the tube board on, or you can turn off the machine complately. You can download the newest owners instructions from our website. The "clever standby" as we call it is not mentioned in your manual...but will be on the manual that will be up this later this week.
On tube life...I suggest turning off the machine completely if it is not to be used for a couple days. It warms up pretty quick...but you can make your own tests to see what is acceptable to you.
Tube life is dependent on the tube type, and how that tube will die. Power tubes are never left on in am amp. Preamp tube...it depends on if it runs out of emmissions, or gets noisy. We have a FAQ on that you may find helpful.
Thanks to all for the information. I use to leave my hifi gear on 24/7, but for the AH, I'm hesitating because of the high price and rarity of the E288CC (when will we have an E288CC in the current production ?). 10000 hours is around one year and 2 months, that's why I'm wondering if the time the player is on and idle count as much as the time it is on and working for the tube life. I'll email AH for that question.Christophe
This is a Phillips Holland SQ premium tube, guaranteed to last 10,000 hours (maybe much more if the op points are conservative).
Since the CDP was designed for 6922/E88cc, the E288cchas much higher plate voltage and current ratings, it should last several years.
Good luck
Carlos
Hello Christophe,My system is powered up 24/7, except for holidays and electrical storms. The reason for this is that I have never found it possible to get warm music out of cold electronics. Try it for a week or two, and see if you notice the difference! Concerning tubes, opinion seems to be divided between those who only want to power up for the duration of the music and 24/7 types like me. Manufacturers like Audio Note recommend 24/7 operation, and reckon that the 6922 family tubes used in their DACs will last approx. 5 years since they do not have to withstand the surge stresses of "power up" when used 24/7. I recommend emailing AH! to get their views on the anticipated longevity of your tubes in their equipment.
Happy listening,
Bill H.
I've also read that you should never turn off your CDP. I've begun to leave it on but I don't know if it's true. I can't compare when it's on 24/7 vs. a cold start - No A to B test. Why does the circuitry of a CDP differ from lets say a tuner or preamp in this reguard? I have all vintage SS and tube gear and don't feel comfortable even leaving it plugged in when I leave the house.
charles
Hello Charles,In my system (and that means all units within the system, not just the CDP) the difference was such that an A/B comparison would have been entirely superfluous - the additional musicality and emotional involvement was so obvious. Since this is why I bother to listen to music, the choice is automatic. However, if you feel uncomfortable about leaving kit unattended when powered up, then maybe 24/7 is not an option for you. For my system I would feel uncomfortable about giving my prized kit frequent "power up" stresses and the consequent risk of reduced reliability, but I guess it's a case of "different folks, different strokes".
Bill H.
test your tubes after a bit and see. I've read that the magical number for audio applicaltions is 85% and we know that many tube manufacturers used the 65% or 60% cutoff as their throw-away point, so you don't have much room regardless.One would be surprised by how some gear bangs on a tube, cold starts notwithstanding. I recently replaced some Munich made Siemens 6DJ8s that came with my new SF Phono1 SE stage and prior to me installing the unit for the first time 20 months ago, I tested all four and rematched them up. All four tubes were over 100% on my Triplett 3423 testor.
When I yanked them out two weeks ago, after on/off moderate use, two were down to 70% and the other two were at like 75%, so they got banged a bit. I was surprised because I don't listen to records everyday, although sometimes I would keep the SF powered up for a couple of weeks at a stretch.
My Blue Circle Galatea 3.1 preamp, on the other hand, uses the same tube family and the front gain stage socket really creams a tube. The buffer less so. If I leave my preamp on for 24/7, which I've done a lot over the three years, I'll get 6-8 months out of a tube and this blows. However, at least I can measure the decrease and judge accordingly. I'm now turning if off when use isn't anticipated.
One really needs to know how their piece of gear treats a tube and most manufacturers will just spout the party line--like the 7308 being a 10,000 hour tube, so don't worry about it.
Take care, Chris
Hello Chris,Yes, I've heard (through this forum and other sources) that certain equipment really works tubes hard. I suppose that the best we can do for other users is to post feedback from our experience to forums such as this. The idea of having to source early 60s Amperex and Siemens & Halske E88CC every few months would cause me serious grief! Happily I have a goodly number of matched pairs of both A & S&H tubes - just in case!
Bill H.
I've used 6dj8's, 2496's and E88CC's and they all seem to come up to speed in a matter of seconds.
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