Curious how the Russian Military 6SN7 (ie 1578) works with the Crack? Anybody know? Since I have some NOS 1578's here that have less than 100hrs on them, I really need to find some way to use them! :)
Recent Images In This Thread
Related Forum Threads
- [Review] Ortofon HD-Q7 Last post on 1/16/11 at 11:59pm in Headphone Amps (full-size)
- All Aluminum Bottlehead Amp.... Last post on 11/10/12 at 5:17pm in Headphone Amps (full-size)
- Schiit Valhalla and the overly bright mids that are masking the bass Last post on 5/24/12 at 1:40pm in Headphone Amps (full-size)
- Do I even need a headphone amp (Tesla T1 / Yamaha home cinema amp) Last post on 11/30/13 at 7:52am in Headphone Amps (full-size)
- Just looked at the Bottlehead amps and... Last post on 8/1/14 at 11:14pm in Headphone Amps (full-size)
Head-Fi Buying Guide (Desktop Amps & DACs)
Last edited: 12/6/16
- Head-Fi Buying Guide (Desktop Amps & DACs) 2Last edited: 12/16/16
- Diy Beginners GuideLast edited: 7/22/13
- Headphone ImpedanceLast edited: 8/18/12
I bought these headphones about year ago (I use them almost everyday), as an upgrade from my g430s when the cable finally wore out. In some cases (only some cases) I think the sound quality might...
Introduction Sennheiser HD650 is one of the (seemingly) consecrated headphones made by Sennheiser as an upgrade (update?) to their well received model, HD600. HD600 has been...
I finally took the plunge and got these. It's amazing how TOTL IEMS can sound so different. Bass: Tight and full. Tip dependent. With the triple flanges thought my head was going to blow off. I...
The original iDSD Micro stood out from the competition as an all-in-one replacement for the most discerning listeners' setups. The original iDSD Micro delivered - I had one, but as I started to not...
Dynamic headphones by the primarily planar producing HiFiman, very good value(especially if you live in america). Detailed and strong treble, decent mids and midbass yet a little light on lower...
Crack;Bottlehead OTL - Page 103post #1531 of 80963/2/13 at 6:32pm
Head-Fi's Best Sellerspost #1532 of 80963/3/13 at 10:03am
There was a discussion on the BH boards a while back about how 6sn7's might not be an ideal match for the crack due to PS circuit. My recollection is that the crack delivers ac to the tubes' heaters, whereas 6sn7's should ideally be getting dc - to say nothing of the possible noise introduced by the adapters.
At the time, this was enough to send me hunting 12bh7's instead - my favorite of which is a 1959 Tung Sol. But I confess I am still curious to hear how a good 6sn7 sounds.post #1533 of 80963/3/13 at 4:50pmpost #1534 of 80963/5/13 at 12:20pm
I'm getting a lot of noise through my Crack when I attach a USB DAC to it. I hear the noise regardless of whether music is playing. Pretty sure it's the USB because when I unplug the cable from my computer it completely disappears. I don't get any noise from the USB DAC when I use my M-stage as an amp though.
When I use an E10 as an SPDIF interface and output coax to my DAC, it's dead quiet. When I input coax (SPDIF) from my Oppo 980H CD player it's dead quiet as well. However, when I use the E10 as the DAC and output it's analog line-out directly to the Crack, I hear the noise again.
Do I just have a noisy USB socket on my computer, or is it the cable, or is the DAC not filtering out the noise?
Or could it be that the braid on the wires from the RCA inputs to the pot in the Crack wasn't done well enough?
Any ideas on why I'm hearing so much noise?
Edited by EraserXIV - 3/5/13 at 12:25pmpost #1535 of 80963/5/13 at 12:41pm
Do you get the noise when plugging in an mp3 player? What about running the laptop from battery?
Is the noise like a low hum, or more like static/white noise?
My initial guesses would be noisy usb socket and/or power supply, or a ground loop.post #1536 of 80963/5/13 at 1:30pm
It's like static/white noise that seems random but does have a slight pattern to it (if that makes any sense). It seems like it has a cyclic pattern where it gets louder and softer at intervals without me touching anything on the amp, DAC, or computer. I haven't tried an mp3 player or unplugging the laptop, will definitely try that when I get home later tonight.
Edited by EraserXIV - 3/5/13 at 1:31pmpost #1537 of 80963/5/13 at 1:34pmpost #1538 of 80963/5/13 at 1:42pm
So that's an issue with the power supply to the laptop? I guess this can be tested easily by unplugging my laptop, will do that later today.
Just curious, why does this noise not transfer when I use an SPDIF interface in the middle of the chain?
Also, if it is the switching power supply from the laptop, are there any ways to fix the noise? I don't really mind using the SPDIF interface, but I like keeping the chain as simple as possible and if I can avoid it, the better. Will certain DACs filter the noise better than others? How come the M-stage didn't pick up the noise?post #1539 of 80963/5/13 at 2:38pm
The spdif is essentially isolated from dirty power noise.
It could be the Matrix has better power or input filtering, or is configured in a way that happens to reject that particular sort of noise.
To "fix" the laptop... well, you could get a better power supply, or just run off battery (maybe a bigger battery, or external battery pack). You can also try a ground loop isolator. They're cheap... like $10 from radio shack. It looks like a regular RCA interconnect with a block in the middle (typically about the size/shape of a D cell battery).post #1540 of 80963/5/13 at 9:59pm
So I think the noise I was hearing is a combination of a couple things. I switched power supplies on my laptop to one with a 2 prong plug and it reduced the noise a lot. At first, I thought it completely eliminated the noise, but when I turned the pot up on the Crack past 12 I started hearing it again (albiet only slightly). Before I switched supplies I was able to hear the noise with the pot completely turned down to 6 (and it was much louder than the new supply past 12).
With the pot turned up to 12 using the new power supply, unplugging the power supply altogether slightly reduced the noise. The noise doesn't completely disappear unless I unplug the USB from my laptop. I'm thinking it's a combination of noise from the power supply (ground loop?) and a noisy USB port. I do most of my listening between 8-10 so it's not really an issue for me I guess. I only barely hear it at 12. I might still toy with the idea of the SPDIF interface though as it completely eliminates the noise.
Any ideas on what a powered USB hub would do?
Edit: this video gave me the idea to switch to a 2 prong plug power supply: http://www.youtube.com/watch?v=jSA2F1AwboU
Edited by EraserXIV - 3/5/13 at 10:04pmpost #1541 of 80963/5/13 at 10:36pm
The powered usb hub *might* help, but no guarantee. You're better off with the unearthed power supply or a signal isolator.post #1542 of 80963/5/13 at 10:52pmQuote:I might still toy with the idea of the SPDIF interface though as it completely eliminates the noise.
Just curious, is he describing jitter or is it simply dirty power from the USB port?post #1543 of 80963/5/13 at 10:57pmpost #1544 of 80963/5/13 at 11:03pm
There's no way any jitter would cause noise that bad. That'd be an utter failure of the device right there.
- Crack;Bottlehead OTL
Head-Fi's Best Sellers
- Head-Fi Buying Guide (Desktop Amps & DACs) 2
- › FiiO X7 | DXD | DSD | 384K/64B | ESS9018+ Android | WiFi |... 12 seconds ago
- › DX200 Details, features and specifications 1st page. With WiFi and... 30 seconds ago
- › Nobsound NS-08E also know as Nobsound 6J9 hybrid tube amp 32 seconds ago
- › Chord Electronics - Hugo 2 - The Official Thread 34 seconds ago
- › The Official Sony MDR-Z1R Flagship Headphone Thread (Live From IFA... 49 seconds ago
- › Schiit Happened: The Story of the World's Most Improbable Start-Up 59 seconds ago
- › HD 558 vs HD 598 Soundstage 1 minute ago
- › Sonore microRendu streamer 1 minute ago
- › Earbuds Round-Up 1 minute ago
- › New Beyerdynamic T5p 2nd generation 1 minute ago
- › Logitech Wireless Gaming Headset G930 with 7.1 Surround Sound by jimtree
- › Sennheiser HD 650 Headphones by Dobrescu George
- › Shure SE846 Sound Isolating™ Earphone by anqallyt
- › iFi Audio micro iDSD by vapman
- › Massdrop x HIFIMAN HE350 by machielsste
- › Sennheiser Momentum In Ear (iOS version) - Black Chrome by HiWire
- › Fiio F1 Dynamic In-ear Monitors by Brooko
- › ENIGMAcoustics Dharma D1000 by geoffalter11
- › Emotiva Stealth DC-1 | Balanced 24/192 Fully Differential DAC by audiobean
- › Sennheiser HD 380 PRO Headphones by Dobrescu George
- › Head-Fi Buying Guide (Travel Headphones)
- › Head-Fi Buying Guide (CanJams)
- › FiiO X3II DAP firmwares with custom themes
- › Flawless Album Suggestions
- › The Audiophile Scene in a Third World Country...
- › Mad Lust Envy's Headphone Gaming Guide,...
- › Mad Lust Envy's Headphone Gaming Guide,...
- › Mad Lust Envy's Headphone Gaming Guide:...
- › Chord Mojo FAQ
- › Head-Fi Logo Gear