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Bottlehead Amplifier Discussion / Comparison Thread: Crack, SEX & Mainline - Page 45

post #661 of 1613
Quote:
Originally Posted by SilverEars View Post
 

I heard crack's output impedance is 200ohms. :eek:  Why do people use it?  That's 2/3 of Sennheisers impedance at 1k.  Does it give pleasant colors to the phones?

 

Yeah, you could lower the impedance of the output tubes by adding some transformers. But then, it wouldn't be a Output Transformer Less design anymore. S.E.X. has transformers and drives about any headphone you can throw at. Now you have to live with the output tube impedance and choose carefully some really nice sounding, high impedance headphones : Beyerdynamics in the 250 to 600 Ohms (T1, 990, 880, 770), Senns : the HD650, 600 (300 Ohms) and of course the flagship HD800 (300 Ohms). Some say that the HD700 isn't the best choice at 150 Ohms. And some like the Crack's musicality even with lower impendance headphones.

post #662 of 1613
Quote:
Originally Posted by JamieMcC View Post
 

 

I remember seeing the Crack listed as 120 Ohm output impedance with the 6080 tube and that it drops to around 70 Ohm output impedance with the Tung Sol 5998 tube.

Intersting..  Thanks for this info.  I didn't know tube amp's output impedance was dependent on tube type.  This information does support why people tube roll and hear differences.

 

What is the tube amp with the lowest distortion and impedance figures?

post #663 of 1613
Quote:
Originally Posted by SilverEars View Post
 

Intersting..  Thanks for this info.  I didn't know tube amp's output impedance was dependent on tube type.  This information does support why people tube roll and hear differences.

 

What is the tube amp with the lowest distortion and impedance figures?


Normally I listen with T1 @ 600ohms & hd650 @ 300 ohms.

 

However my ATH W1000X @ 42 ohms also sound really nice when plugged into the Crack with the 5998 tube with the 6080 the bass is noticeably a little loose in comparison however the mids are very nice and as I'm not a bass head I would happy live with the trade off. Sonic wise its easily good enough to live with long term.  It really surprised me how good the ATH were out of the Crack.

post #664 of 1613
Quote:
Originally Posted by SilverEars View Post
 

I heard crack's output impedance is 200ohms. :eek:  Why do people use it?  That's 2/3 of Sennheisers impedance at 1k.  Does it give pleasant colors to the phones?

I'm sorry, this is wrong.  It states, they recommend 200ohm load, not meaning output is 200ohms.  Sorry for this, I was very tired last night.  

post #665 of 1613
Thread Starter 
Quote:
Originally Posted by SilverEars View Post
 

I'm sorry, this is wrong.  It states, they recommend 200ohm load, not meaning output is 200ohms.  Sorry for this, I was very tired last night.  

 

Haha. I think we all have at least one of those posts in our history!

post #666 of 1613
Quote:
Originally Posted by Loquah View Post
 

 

Haha. I think we all have at least one of those posts in our history!

 

And here I was hovering my cursor over the word 'those' hoping that it was a link  :beyersmile:

post #667 of 1613

Thanks for the feed back on the Sex with speakers

post #668 of 1613
Quote:
Originally Posted by SilverEars View Post

What is the tube amp with the lowest distortion and impedance figures?

Usually the one with the most feedback. Based upon my limited experience I would suggest not relying upon a single spec to make a decision about which amp to use. You really have to listen to an amp with the headphones and source you plan to use to make an informed decision.
post #669 of 1613
Anyone want to feed my Bottlehead habit? Selling off some nice unused amp parts, including Teflon caps, beeswax caps and chokes.

Reason - To partially fund Bottlehead DAC pre-release commitment.

http://bottlehead.com/smf/index.php/topic,6257.0.html

Ch.. Ch... Check it out

.evil_smiley.gif
Edited by MoatsArt - 5/14/14 at 7:29pm
post #670 of 1613
Quote:
Originally Posted by JamieMcC View Post
 

 Sex with speakers

:k701smile:

post #671 of 1613

I notice Doc always brings a bunch of HD800's to the meets, so I am assuming all the amps are pretty good with that phone.Which one sounds the best thought and by how much. Right now I am looking at the SEX for 2 reasons, price (obviously) but also because I have some Grado's also and I know that amp will work with both low and high imp phones. If the Mainline is really the last word though I may have to just bite the bullet and go for it. The build, I admit, is intimidating to me as I have never built anything that large or that complicated before, but others have done it so I probably can too.

post #672 of 1613

From what I understand, with the HD800s the Mainline really shines. Same for the T1s. Certain very power hungry phones like the HE-6 are better served by the S.E.X., but neither Sennheiser nor Grado will be a challenge to the Mainline.

post #673 of 1613

From what I've heard so far, it's pretty surprising to say that I actually prefer the T1s to the HD800s when paired with the Mainline. The HD800s + Mainline combo sounds sometimes a bit harsh and fatiguing to me, but I've never felt that in the T1 + Mainline combo.

post #674 of 1613
Thread Starter 
Quote:
Originally Posted by HPiper View Post
 

I notice Doc always brings a bunch of HD800's to the meets, so I am assuming all the amps are pretty good with that phone.Which one sounds the best thought and by how much. Right now I am looking at the SEX for 2 reasons, price (obviously) but also because I have some Grado's also and I know that amp will work with both low and high imp phones. If the Mainline is really the last word though I may have to just bite the bullet and go for it. The build, I admit, is intimidating to me as I have never built anything that large or that complicated before, but others have done it so I probably can too.

 

This may seem strange, but the Mainline is probably no more difficult and perhaps slightly easier to build than the SEX because it's so well laid out.

 

Quote:
Originally Posted by SilverTrumpet999 View Post
 

From what I understand, with the HD800s the Mainline really shines. Same for the T1s. Certain very power hungry phones like the HE-6 are better served by the S.E.X., but neither Sennheiser nor Grado will be a challenge to the Mainline.

 

Exactly right

 

Quote:
Originally Posted by Aeolus Kratos View Post
 

From what I've heard so far, it's pretty surprising to say that I actually prefer the T1s to the HD800s when paired with the Mainline. The HD800s + Mainline combo sounds sometimes a bit harsh and fatiguing to me, but I've never felt that in the T1 + Mainline combo.

 

I personally agree, but many people love the HD800 with Mainline so I guess that's a personal taste thing.

post #675 of 1613

I currently have a Lyr and I love my HD800 on it. I would certainly think the Mainline was quite a bit more refined than the Lyr and so I doubt the treble would bother me...you see, old age does have some advantages. Either that or the Lyr is a better refined amp...probably not.

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