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HJ99
8
May 27, 2018
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Hello, I have similar questions about smoking and burn in. All components are stock, using HD-6XX. Question 1: I recently got my amp. Initially when I turned it on in the first 2-3 minutes smoke did come out from the region of the tubes but then subsided.- Is this normal? Question 2: I also have had an evolving hum issue. Initially there was a loud hum in the left channel when no music was playing. I then discovered the tubestore instructions and burned in the preamp tube without the power tube for over 18 hours. Upon reinstalling the power tube and using the amp the hum on the left channel had disappeared but there is a low volume hum in the right channel and despite over 72 hours of use is still there.- Is this normal? Question 3: I hear the tubes "warming up with noises you hear from a heater with the 'pops' of expanding metal"- Is this normal? Question 4: I need to know if the tubes are faulty or the amp itself (maybe burned a component initially with the smoking?)? Is it worth trying different tubes? I do enjoy the amp but need to know if I happen to have gotten a faulty item.
Thx in advance for help from more experienced users.
May 27, 2018
FaceMcBashy
139
May 27, 2018
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1: It took longer for the smoke to subside on mine. Took over an hour but it is gone now so I guess this varies but people on I see other people on the forum having similar issue and results. 2: There was a left hum with stock tube but it went away quickly. I am burning in a tung sol 6SN7 GTB right now and there is a very noticeable hum on the left and a small hum on the right also. Still waiting for the burn in to finish. 3: I haven't noticed any pop sound on mine so far. 4: Stock tubes on mine did not have any issues even though it looked pretty old and janky. It is hard to say whether it is tube or amp's problem for 2 but I would think that it is much more likely a tube issue rather than amp. I had the same problems as you but it all fixed itself pretty fast.
May 27, 2018
HJ99
8
May 29, 2018
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Hi
I was able to start listening to the amp more closely and there is a buzzing coming from the amp itself from the box behind the power tube. Does your amp also do this?
May 29, 2018
FaceMcBashy
139
May 29, 2018
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Yes, when it first start up. I believe it is the big transformer in the back. Don't hear it after the first few seconds though.
May 29, 2018
HJ99
8
May 31, 2018
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Hi
So here is the update that may help those buying this amp for the first time.
Burn in for these tubes take time, I mean at least 48 hours of total time. Both tubes need time, many say the 6AS7 should be quiet- this was not the case for me. I have bought new tubes to see if I have better luck.
There is a low, very low hum present in the right channel, the buzz from the transformer can be heard if you put your ear right next to the transformer- both of these were much louder before the burn in and now are much much quieter.
Currently end result:
1. No smoking apart from very beginning where I believe the tubes initially got hot 2. Extraneous noises like "heater warming up" or tube noises- no longer present after burn in of tubes 3. The 6SN7 needed 48 hours of burn in, the 6AS7 needed 24 hours - end result: left channel hum resolved, right channel hum minimal but still present 4. The amp is not covered by manufacturer warranty so Massdrop can only offer a refund if you're not happy- however after the burn in period the the low hum is not enough for me to return it, it is below the noise floor of the music and the sound coupled with my HD-6XX is intoxicating, I listen every night. 5. Will be selling my Vali 2 as I enjoy this amp so much more. My current setup: WDMyCloud NAS (lossless files ALAC)- TPLINK AV2000 ethernet Powerline adaptor- ethernet to Yamaha-WXC-50- Darkvoice-HD-6XX
Thank you Face McBashy for helping me figure out if amp was faulty.
Will update if new tubes resolve the minimal right channel hum.
May 31, 2018
FaceMcBashy
139
May 31, 2018
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I am still burning in my tung sol 6sn7 but still very noticable buzz on the left. It has been 3 days and I don't know how long I should keep at it tbh.
May 31, 2018
HJ99
8
May 31, 2018
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Update: 6AS7G RCA tube from eBay (seller Mike Koch, $29) arrived and R hum disappeared! Now dead quiet and sounds amazing!
May 31, 2018
SStas
65
Jun 4, 2018
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I am going to add my $0.02 here for you, since I believe it to be solicited :)
I do not have experience with this amp, but I have been working with similar symptoms with my reference 2-channel system that includes a fully tubed input/output pre-amp (all 6SN7 tubes), and hybrid tubed mono-block power amps (6922s on the input stage only).
Here was my struggle:
When I first built this system, all I could hear was pops, hiss, and what seemed like the radio coming through the speakers. IT DROVE ME CRAZY after investing so much money into a HiFi system.... First I purchased a pretty expensive power-line conditioner to eliminate the EMF and RFI noise that existed; I hope it would be the silver bullet, but sadly, it was not. Next, I went out and bought a variety of pretty fancy tubes for the pre-amp. This again helped to a variety of degrees based on the tubes being rolled, with new-stock cryo-treated Electro-harmonix being the quietest I have found. Next, I realized there was noise being caused by mechanical resonances in the amps themselves, and therefore the tubes. So, I added sorbothane feet to the bottom of the pre-amp, and a medium weighted rock to the top, close to the tubes. This paid serious dividends in reducing the noise floor, but some noise remained...
Where is that noise coming from? The tubes! What have I realized? No matter what you do, there will always be tube noise! Why? Because the quality of my amplifiers won't hide anything, and tubes will always have noise, or they wouldn't be adding that "warmth" everyone is after.
Moral of this story is that no tube amp will be perfectly quiet, but if you are at 25%-50% gain, and hear a bunch of pops and crackles, you likely have crappy tubes, crappy power, or a mechanical isolation issue. A good quiet amp will make these three things even more evident than one filled with counter-distortion effects.
Sorry for the rant, but hopefully this helps you avoid having to do all the guessing and testing I went through to come to this realization.
S.
Jun 4, 2018
wineross13
16
Jun 4, 2018
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Agreed, sounds like a tube issue. I suggest changing one thing at a time to isolate it.
Jun 4, 2018
mindhead1
476
Jun 6, 2018
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The RCA 6AS7G took an already great soundimg DV to the next level for me. Very quiet and expanded soundstage.
Jun 6, 2018
HJ99
8
Jun 9, 2018
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Hi. Just wanted to recognize excellent massdrop customer support. When I told them that replacing the power tube solved my problem. They refunded me the price of the power tube I bought on eBay. That is excellent customer support. Thank you Massdrop.
Jun 9, 2018
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