[TonyRS]

Quote:

Is it on one side or both?  It might be the tube pins and/or the socket contacts.  You might try turning off and unplugging the Lyr, then remove, swap around, and re-install the tubes and listening again.  Sometimes that will help the noise go away.  If not, then the problem is more likely something in the Lyr that Schiit would need to fix.
 
Hope this helps...
 
Cheers and Good Luck!

-HK sends

Thanks, going to try switching them around right now.
 
Quote:

 
Just out of interest, are you using really sensitive/low impedence headphones?
 
I've found i can hear hissing with anything too sensitive, this is because the volume pot controls the signal before it hits the tubes, the tubes are directly coupled to your headphones, volume pot won't affect the tubes, and thus a lot of noise gets through.
 
If it's different to hissing/buzzing or you're using high impedence or hard to drive headphones then i would contact Schiit.

Using LCD-2's at the moment
 
Quote:

no No and NO
 
My Lyr is as quiet as a church on Superbowl Sunday.  Always was, still is.  Stock tubes or exotics.
Sadly, yours has "an issue"
 
I'm sure Schiit will help you sort it out.

Hehe, you're right. I believe i might have a ground loop. I'll try to buy a ground loop isolator to see if that helps first.

 

[sceleratus]

Quote:

Thanks, going to try switching them around right now.
 
Using LCD-2's at the moment
 
Hehe, you're right. I believe i might have a ground loop. I'll try to buy a ground loop isolator to see if that helps first.

A ground loop is a problem in your house wiring.  It "can" be dangerous.
Try to fix the problem first rather than mask it.  If it's too small to hunt down and isolate then mitigate it before it reaches your amp.

 

[claud W]

I just could not stand it. I had to try a new flavor---headphones. Got a pair of Mad Dogs yesterday. Very clean clear sound with good bass--midrange to die for. and cheap at $300!!

 

[Grado77]

Quote:

I'm getting annoyed with the loud noisefloor on the Lyr.
 
Anyway to stop it, guys?

 
When I use low imp phones like AH-D600 or ATH-A900X with the Lyr and Philips PC189 tubes, it's very noisy (could be a bad set of tubes although they are dead quiet with HE-500). When swapping to 6N1P-EV, the noise level is minimal but not entirely eliminated. Asgard in comparison is silent.
 
When using HE-500 or 400 with the above tubes, it is dead quiet.
 
The Lyr is the only tube amp I've used with a high noise floor but also the most powerful. 3 Little Dot tube amps I use are all dead quiet.
 
The Bitfrost I have connected to my Lyr causes a ground loop that can only be eliminated with a cheater plug or HumX ground loop isolator. The Bitforst is the only piece of a boatload of audio gear in my home that causes a ground loop scenario (doesn't matter which amp I use with it).
 
It would be great if the units were plug and play, but they aren't and have to be finessed. It's still the best solution for my HE-500 as I hear almost zero noise when using them.

 

[hedphonz]

just ordered the lyr and due in a few days 
 
cant wait to start some tube rolling but this thread is mammoth and Im going dizzy trying to comprehend it
 
Can anyone suggest some tubes to give the HD800's more oomph in the bass department please

 

[ilikepooters]

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[Salvatore]

Since Lyr accepts pretty much all the same tubes than Aune T1, I figured there could be some interesting tube impressions and general info here (especially for the beginners, just skip the T1 specific sections):
 
http://www.head-fi.org/t/633006/aune-t1-usb-tube-dac-amp-discussion-thread-see-first-post-for-faq/2010#post_9502294
 
If any of you guys have some useful links that I could add to the post please send them to me. Oh and thanks for this great tube rolling thread!

 

[TonyRS]

Quote:

 
When I use low imp phones like AH-D600 or ATH-A900X with the Lyr and Philips PC189 tubes, it's very noisy (could be a bad set of tubes although they are dead quiet with HE-500). When swapping to 6N1P-EV, the noise level is minimal but not entirely eliminated. Asgard in comparison is silent.
 
When using HE-500 or 400 with the above tubes, it is dead quiet.
 
The Lyr is the only tube amp I've used with a high noise floor but also the most powerful. 3 Little Dot tube amps I use are all dead quiet.
 
The Bitfrost I have connected to my Lyr causes a ground loop that can only be eliminated with a cheater plug or HumX ground loop isolator. The Bitforst is the only piece of a boatload of audio gear in my home that causes a ground loop scenario (doesn't matter which amp I use with it).
 
It would be great if the units were plug and play, but they aren't and have to be finessed. It's still the best solution for my HE-500 as I hear almost zero noise when using them.

Thanks! Will be purchasing the HumX soon. Do you plug it into the Lyr or Bifrost?

 

[Grado77]

Thanks! Will be purchasing the HumX soon. Do you plug it into the Lyr or Bifrost?

Bifrost....it works just as well as the cheater

 

[hedphonz]

Quote:

Mullard E88CC/ECC88
Amperex 6DJ8 PQ/Orange globe
Saratov 6N23P-EV
Brimar 6BQ7A

 
Quote:

Since Lyr accepts pretty much all the same tubes than Aune T1, I figured there could be some interesting tube impressions and general info here (especially for the beginners, just skip the T1 specific sections):
 
http://www.head-fi.org/t/633006/aune-t1-usb-tube-dac-amp-discussion-thread-see-first-post-for-faq/2010#post_9502294
 
If any of you guys have some useful links that I could add to the post please send them to me. Oh and thanks for this great tube rolling thread!

 
thanks for that info guys - plenty of late night reading ahead
 
When i google those tubes mentioned there seem to be  many variations of the same tube so learning which ones to buy could be a lot of trial and error I suppose
 
Generally are specialist tube suppliers or ebay the cheapest places to buy from ?

 

[nelamvr6]

Guys:
 
Since I tried the RTC E188CC tubes and they weren't quite my cup of tea, I'll be selling two pairs in the For Sale forum.  
 
I'd rather they go to someone in this thread.  
 
Look for my post in the For Sale forum soon, and if anyone here is interested, feel free to just PM me any time.

 

[ilikepooters]

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[hedphonz]

Quote:

 
For the Amperex you should be looking for the orange label, made in Holland with either the PQ shield, or the orange globe logo.
http://www.ebay.co.uk/itm/AMPEREX-ORANGE-GLOBE-6DJ8-ECC88-VACUUM-TUBE-1970-MATCHED-PAIR-SWEET-ONES-/321138597034?pt=Vintage_Electronics_R2&hash=item4ac55a1caa
http://www.ebay.co.uk/itm/AMPEREX-ORANGE-LABEL-6DJ8-ECC88-VACUUM-TUBE-1974-MATCHED-PAIR-CHECKED-TEKTRONIX-/221233485082?pt=Vintage_Electronics_R2&hash=item33828b151a
 
Mullard you should look for the british made tubes, E88CC or ECC88
http://www.ebay.co.uk/itm/Matched-Pair-Mullard-E88CC-6922-6dj8-ECC88-Tubes-Gold-Pins-Shield-Logo-1960-/171037404585?pt=Vintage_Electronics_R2&hash=item27d29fada9
 
Brimar 6BQ7A there is only 1 variety so that's an easy one.
http://www.ebay.co.uk/itm/NOS-NIB-Pair-Brimar-6BQ7A-Box-Plate-Vacuum-Tubes-/151042693962?pt=Vintage_Electronics_R2&hash=item232ad89b4a
 
There are many russian tubes, but Saratov/Reflector 6N23P-EV are really rated for their bass.
http://www.ebay.co.uk/itm/6N23P-EV-ECC88-6DJ8-SILVER-GRID-AND-PINS-NOS-2-pcs-/261220766417?pt=Vintage_Electronics_R2&hash=item3cd1f892d1
 
Voskhod 6N23P have been mentioned recently, can't vouch for them myself until i receive them, but these are the ones. I'll let you know if they are a bassy tube.
http://www.ebay.co.uk/itm/MATCHED-PAIR-of-6N23P-70s-USSR-Military-Grade-TUBES-PAIR-6DJ8-E88CC-/300915994519?pt=Vintage_Electronics_R2&hash=item460ffdaf97
 
Ebay is generally cheaper, but beware of fakes.

brilliant info  - couldnt have asked for better
 
I suppose if you buy off established sellers with lots of +feedback then the chance of fakes will be a lot less
 
anyway time to get the paypal going again !

 

[guitarlp]

How much should I be paying on eBay for some Mullard E88CC tubes?
 
I found these for $199:
http://www.ebay.com/itm/2-MATCHED-NOS-MULLARD-GOLD-PIN-E88CC-6922-6DJ8-for-DAC-Preamp-Headphone-Amp-/370831037477?pt=Vintage_Electronics_R2&hash=item5657409425
 
Is that too much? There's some cheaper ones to be found, but they don't look as new as these do.

 

[ilikepooters]

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