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Post by tunkejazz on Sept 29, 2015 5:29:07 GMT
solderdude has nailed it:
In my office moving the amp 10 cm just did the trick. At home...it was a bit trickier but moving the amp + pluging my laptop to the power supply did help a lot!
...and when you solve the problem, how about a brief and subjective comparison of those tubes in the pictures? ;-)
Some people with the Frankember have been asking about those Treasure ones, although I am not sure now if it was here or in HF.
Good luck!
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olindh
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Post by olindh on Sept 29, 2015 6:46:24 GMT
If you have a desktop computer, then try and connect the rca in of the Ember to the headphone out of the desktop. If the hum dissapears then it most definitely is a grounding issue.
I am also very interested in listening impressions between the 7193s and the Shuguang. Cheers!
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howie
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Post by howie on Sept 29, 2015 7:28:43 GMT
I have the same problem with some tubes. In my set-up my body seems to be responsible because the hum disappears if I move away from the amp-say about a meter. As I approach the amp the hum gets louder, and is loudest if I place my hands close to the tube. Just touching the RCA's gets rid of the hum.
Maybe I am acting like some sort of electrical transmitter.
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Post by tunkejazz on Sept 29, 2015 10:02:36 GMT
...or somehow blocking wifi/gsm signals? :-P
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solderdude
Administrator
measureutternutter
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Post by solderdude on Sept 29, 2015 14:27:52 GMT
Touching the RCA's creates a 'grounding path' that the hum takes as it is a lower impedance.
Grounding to a real ground (waterpiping, safety ground or central heating) may well solve that problem.
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wrhxc
valued member
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Post by wrhxc on Sept 29, 2015 17:31:21 GMT
walbum4262, I am glad that you made this post as I just upgraded my Ember last night and I am having a similar problem (first post here, as well). The hum is present, mainly in the right channel on both my HD650 and HE500, and the hum increases when I get closer to the amp or put my hand close to the tubes/adapter, but goes away almost completely when I touch the amp. I've moved the Ember to a completely different room, disconnected the RCA cables, and the hum is still there. The hum was not present with the stock tube. I have the amp with 6J5 tubes on now, wondering if there will be any change after 24 hours. I'll keep an eye on this thread and try a few more things this evening!  |
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Post by walbum4262 on Sept 29, 2015 17:39:30 GMT
Thank you all for the great suggestions.. I'm an electrician so I'm going to get myself a ground spear and hammer it down into the ground near the room I'm sitting in and do some ground wire to my desk  Also I should move the apple airport so it's not sitting directly up against the amp In regards to comparing the 2 types of tubes, well I started the Journey into head fi in march this year.. But I have been so fortunate as to be part of the Danish head fi forum that has some great people who's willing to let one drop by them to listen to there equipment So in still learning a lot about sound and how equipment can sound different and effect the outcome, My first amp was the aune t1 tube dac/amp and I was not entirely able to tell different tubes from another on that one. I but I'll see in the next couple of weeks if I can do some comparisons my time is limited with 3 kids, wife and house |
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howie
quite active
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Post by howie on Sept 29, 2015 18:17:39 GMT
walbum4262, I am glad that you made this post as I just upgraded my Ember last night and I am having a similar problem (first post here, as well). The hum is present, mainly in the right channel on both my HD650 and HE500, and the hum increases when I get closer to the amp or put my hand close to the tubes/adapter, but goes away almost completely when I touch the amp. I've moved the Ember to a completely different room, disconnected the RCA cables, and the hum is still there. The hum was not present with the stock tube. I have the amp with 6J5 tubes on now, wondering if there will be any change after 24 hours. I'll keep an eye on this thread and try a few more things this evening! Nice photos. I have hum with RCA 7193's but not K-R's. So far my 6J5's are fine. I also get hum with the occasional 12ax7. I'm going to take Solderdude's advice and ground the RCA's to a central heating pipe. Will need to go out and buy a long earth wire. |
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Deleted
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Post by Deleted on Sept 29, 2015 18:23:21 GMT
Do you guys who are having problems have wall sockets in the room? I only ask because wrhxc clearly does. I don't but everything in this room is connected to the internet wirelessly and I get zero noise so it may be the fact that the power is working at around the same altitude? I'm guessing really, obviously. I just can't stand to see people not enjoying the music. |
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Post by walbum4262 on Sept 29, 2015 18:43:29 GMT
I have found one of the sources for half the noise in the chain. When I connect my aune x1s dac to my laptop computer I get a bad jitter frequency on top of a more buss like hum So when I play from my iPhone 6 out the Lightning port to a us but hub and then to the aune x1s the jitter is gone but the buss like him is still there and can be reduced with grounding. For everyone not knowing, when you try to connect an iPhone to the USB on a DAC the iPhone shuts down the port due to the iPhone thinking to much current will be drawn even tough it does not have to deliver any current, this can be bypassed by having a lightning to USB camera kit and then connect that to a USB hub and from there to the dac Like seen here in the picture with my aune t1  Every other dac I have come across this has worked aswell |
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howie
quite active
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Post by howie on Sept 29, 2015 18:45:31 GMT
Touching the RCA's creates a 'grounding path' that the hum takes as it is a lower impedance. Grounding to a real ground (waterpiping, safety ground or central heating) may well solve that problem. Thanks-that's got rid of the hum-though I forgot to attach the wire to a non-painted part of the heating pipe first time round! |
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Post by musicman on Sept 30, 2015 0:13:16 GMT
Howie, how do the 6j5's compare to the 7193's? See you have both, do you use the same adapter for both types of tubes or do we need another adapter for the 6j5's? Glad you got it sorted out on the hum problem.
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howie
quite active
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Post by howie on Sept 30, 2015 6:38:49 GMT
Thanks-it's such a relief when the hum suddenly disappears.
I really like the 6J5's. They are similar to the 7193's, but, so far with the tubes I have tried, I find they separate the instruments a little better, are more dynamic, and give a bit more depth to the sound-stage. They are also mostly not expensive to buy-they are a bit like hidden treasure.
Unfortunately you do need to get a different adapter (at least I did as I am clueless, electronically). They can be found from the usual Chinese sellers at a similar price to the 7193 adapters. They do look a bit more pretty in the amp than the 7193's.
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Post by musicman on Oct 2, 2015 1:43:16 GMT
Thanks Howie, have been looking on ebay and most of the offerings with two tubes are more than I am willing to pay, the singles if you hit it right, and got two of similar quality, make and condition, plus the adapter, I think for now I will just stick with the 7193's, at least until I sell off all my other tubes.
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Post by tommo21 on Oct 2, 2015 11:11:56 GMT
I've got a new favourite tube. Russian 6n6p with gold grid. After Russian 6sn7 with metal base and the GE 6SN7GTB, this tube has been a revelation. Almost immidiatly got a more airy and spacious sound with deep wonderful bass. I'm not going through my tubes too fast though. I usually listen to them for 4-5 days to get the feel of them, before changing. Around 7 hours playtime a day. I have lots of tubes to get through so this will keep me occupied at work through the winter. I've got the Frankenember setup ready, but it will still have to wait a bit.
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