Welp, although I got held up and procrastinated 6 months before even cracking the chassis open (jeez where does the time go) ... it appears to simply be the NuTube failing on that channel. Ordered a replacement from the shop just now. NOt sure why this happened, but I do tend to leave it on all the time, maybe I'll stop doing that. I also have al the parts for a PSU project ready to start for this, maybe now is the time! Thanks guys for the help.
I have not personally seen a bad Nutube, nor have I encountered ringing/noise in the units I
have worked with. But it's still a tube, and occasionally there will be failures, probably more
than you will see with transistors.
have worked with. But it's still a tube, and occasionally there will be failures, probably more
than you will see with transistors.
Thx Papa. I have a replacement coming next week thankfully (and this one has served well, on 24hrs, for about 2 years) – but if the L channel on NuTube has died, do you think I need to run tests elsewhere to locate the cause of that happening? Not sure where to start, if so.
There was some discussion about not leaving these on all the time somewhere in this thread. I seem to remember reading that these tubes have a 10,000 hour expected lifetime. A (non-leap) year is 8,760 hours.
Hmm I missed the don't leave it on memo. When mine failed I measured all of the build test points and one channel was correct and the other the values were not right. Someone told me to take a very close look at the fine wires and one was broken. I ordered a new tube, replaced it and it seems to work fine now.
Correction: Expected life is 30,000 hours. About four years continuous use.
https://www.korgnutube.com/en/faq
https://www.korgnutube.com/en/faq
HI Andrewhogge
Welcome to the club. See my post 8524.
You are the eleventh person at least to report a Nutube with a broken heater wire on the left (!) side of the nutube. It seems they have severe QA and QC problems.
The nutube either works or the left heater wire breaks. Mine did worked for about two to three weeks.
Welcome to the club. See my post 8524.
You are the eleventh person at least to report a Nutube with a broken heater wire on the left (!) side of the nutube. It seems they have severe QA and QC problems.
The nutube either works or the left heater wire breaks. Mine did worked for about two to three weeks.
This recently happened to mine, in fact the broken filament looks the same as yours pictured, on the left side. It happened around the time of the peak solar activity. Possible voltage spike? Probably coincidental. One of my hard drive wall warts crapped out at that time, too. I stopped leaving mine on 24-7 a while ago. Though I believe turning on/off cycles is more stressful to traditional tubes, not sure about the Nutube. I assume it's the same, though. When it blew there was a nice pop out of the left channel, but not damaging to anything downstream, including my ears.
@ClaudeG
It's done, technical tests all green, in the next few days when i get time it will be ear tested. Then packaged at friends gig, and again properly listened to with a better pot.
It's done, technical tests all green, in the next few days when i get time it will be ear tested. Then packaged at friends gig, and again properly listened to with a better pot.
These are very popular for good reason. I still have about 3 of them built waiting for me to get on the ball and build a good chassis.
I have been introduced to these many years ago, as a result of my encouraging a EE friend to investigate the design.
The result being there are five variants built and a original Spec' as well.
I have had the original spec on long term loan, and really enjoyed what it could do with my 845 Monoblock Amp's even with the added gain that was present.
I have a Monoblock KB1 to be built, with bespoke built VC's for the role.
The intention is to house the Korg Nutube in a Panzerholz casing and house the whole of the Electronics in a Airtight Panzerholz or Permali Chassis.
The result being there are five variants built and a original Spec' as well.
I have had the original spec on long term loan, and really enjoyed what it could do with my 845 Monoblock Amp's even with the added gain that was present.
I have a Monoblock KB1 to be built, with bespoke built VC's for the role.
The intention is to house the Korg Nutube in a Panzerholz casing and house the whole of the Electronics in a Airtight Panzerholz or Permali Chassis.
I am unfamiliar with Panzerholz chassis, but you have my attention. It is a part of the build that many often overlook.
Another's supplied info will immediately show where the immediate attraction to the Densified Wood is to be seen using measurements as a data
https://www.lessloss.com/docs/20130219/LessLoss_Virtues_PRINT.pdf
https://www.lessloss.com/docs/20130219/LessLoss_Virtues_PRINT.pdf
Not so much a comparison but an awakening when I was working on audio units and removed the top plate. Striking the top plate cover, held by my fingertips, it very much sounded like a bell. Sure this isn't a speaker being tested, but non the less it was surprising to hear such a clear and long lasting resonance. Then I attached a self adhesive sound sheet and the bell mostly disappeared into a dull thud. Since this isn't so much a viable problem in electronic gear itself, it gave me some idea of the extent to which this problem exists even in a speaker cabinet.
Panzerholz seems to be an improvement yet, I wonder about its availability and cost. Might be worth it if it cuts down on the labor/hassle of treating a cabinet being built.
Panzerholz seems to be an improvement yet, I wonder about its availability and cost. Might be worth it if it cuts down on the labor/hassle of treating a cabinet being built.
