Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › Crack;Bottlehead OTL
New Posts  All Forums:Forum Nav:

Crack;Bottlehead OTL - Page 288

post #4306 of 5981
Quote:
Originally Posted by FlySweep View Post
 

 

Nope.. the Tesla pictured is a 12AU7.  What you're seeing in my picture is a "socket saver" (from TubeMonger) that I use to maintain the integrity of the Crack's input socket.  Since I roll input tubes fairly often, I'd rather the adapter socket wear out (which is easily replaceable) rather than the Crack's input socket.  The "vibration reduction" feature is hit or miss, IME.. for a couple of more microphonic tubes I had, it actually worked well.. for a couple of others, not so much... so YMMV.

How's that socket saver working out for you? There are times I feel like it's interfering with the sonics and times when it's not.

post #4307 of 5981
Quote:
Originally Posted by FlySweep View Post
 

 

Nope.. the Tesla pictured is a 12AU7.  What you're seeing in my picture is a "socket saver" (from TubeMonger) that I use to maintain the integrity of the Crack's input socket.  Since I roll input tubes fairly often, I'd rather the adapter socket wear out (which is easily replaceable) rather than the Crack's input socket.  The "vibration reduction" feature is hit or miss, IME.. for a couple of more microphonic tubes I had, it actually worked well.. for a couple of others, not so much... so YMMV.


Cool thanks. Might pick up one of those Tesla tubes and give it a go.

post #4308 of 5981

I got myself a stepped attenuator and a G.E.C CV 2523 tube. Read about it here: 

 

http://diy.koenigs.dk/2014/03/18/stepped-attenuator-legendary-g-e-c-cv-2523-tube/

 

Tight fit huh?

post #4309 of 5981
Quote:
Originally Posted by lokesen View Post
 

I got myself a stepped attenuator and a G.E.C CV 2523 tube. Read about it here: 

 

http://diy.koenigs.dk/2014/03/18/stepped-attenuator-legendary-g-e-c-cv-2523-tube/

 

Tight fit huh?

 

Hi great write up and echoes my own experiences with a similar set up. In retrospect I feel the standard pot really acted as a veil to the sound coming through from the caps Switching to the attenuator gave a very nice improvement as you describe.
I was also unsure about the tactile nature of clunky nature of the steps vrs the smooth feel but you soon get used to it.

post #4310 of 5981

 

I have the msox2024a.  I'm guessing since I already have the highest bandwidth model within the 2000 series, I'm not eligible?  They didn't word the details very clearly.  My buddy showed me that thread on eevblog forums last year and I was too scared to brick my scope to try it lol.

 

I did hear that they were doing a promotion this year where you pay a smaller flat fee to get ALL software features unlocked.  I don't remember the price or when the promotion starts, but I might take advantage of that one.  The stock memory is pretty weak and even weak with the upgrade.  Sad they advertise segmented memory but it comes locked unless you pay to unlock it.  If you've seen the specs on the Rigol scope, you probably know that they make Agilent's stuff look pretty overpriced.  (my scope has 14 kp stock, 1 mp with paid upgrade, the rigol 2000 series has 14 mp stock, and 56 mp with paid upgrade)  Bleh.  Maybe this will force Agilent to beef up their specs for their next iteration of scopes.

 

Back on topic: does a tube rolling thread for the crack exist yet?

post #4311 of 5981
Quote:
Originally Posted by bleudeciel16 View Post

Back on topic: does a tube rolling thread for the crack exist yet?

 

I think it's this one... http://www.head-fi.org/t/476650/

 

:tongue: 

 

 

 

Warning: Spoiler! (Click to show)
Edited by Armaegis - 3/19/14 at 1:26pm
post #4312 of 5981

There is a Crack tube rolling thread on the Bottlehead forum "Tube Rolling w/Crack"

 

http://bottlehead.com/smf/index.php/topic,663.0.html

post #4313 of 5981

boy I would kill for a crack. I'm scared I'd break something building it..

post #4314 of 5981

^^ Buy one built or build. It's everything that people say it's cracked up to be. :wink:

post #4315 of 5981

A little while back I removed the cascade bypass caps I was experimenting with and have been running with the 100uf jfx films for a few days in stock form to re-accustom myself with the presentation.

 

Then it was up the turn of the Valab Fast Power 47uf pio (polypropylene in oil) I was curious to try just one 47uf with the 600ohm T1 then two paralleled for 94uf  and then with some different bypasses. 

 

This is running one 47uf capacitor instead of the recommended 100uf.

 

The sound with single 47uf has turned out to be a bit of a surprise there, is a noticeable difference in bass quality and control in the bass compared to the 100uf but it still comes across as quiet acceptably and I have listened to far worse sounding set ups.  

 

What is clear with 47uf is that bass aside there are some nice qualities here. There was defiantly a floating in front of you quality to some vocals coming though and the smoothness I have read about being associated with the oil capacitors is evident. Transients and dynamics also come across as fast while more note decay is sustained in the background. Soundstage has closed in and has a more intimate feel to it.

 

I had planned to run the 47uf on its own for a couple of days this didn’t work out mainly because listening to it wetted my appetite to much as to how the Crack would sound with two paralleled each side to get 97uf that is much closer to the 100uf specified.

 

My cap experiments are a little further on than this post might suggest, I am just catching up and will update how these caps panned out once they have had a chance to burn in.

 


Edited by JamieMcC - 3/21/14 at 3:16am
post #4316 of 5981

Jamie, you're an alchemist. Love this thread every time I come back. Needless to say, despite my early protestations of satisfaction, I'm now rolling a TS 5998 and the Mullard ECC82, but got a Brimar e80cc on the way. Also rolled a Mullard 6080 for a few days. I enjoyed it almost as much as the 5998, though it's clearly a bit different. Took me back closer to stock tubey sound but with more clarity. Looking forward to this e80cc. Might finally be time for SB though! And then step attenuator...and then...

 

All that said, no matter what I've been running the Crack with, it's an absolute joy. I'd be happy with any of them, but just like the whisky cabinet, it's great to have different moods for the moments.

post #4317 of 5981

I have an extra 5998 if anyone is interested let me know.

 

Also, I'm considering a quickie. Can someone who owns one pm me. I have a few questions.

post #4318 of 5981
I also have many tubes for Crack some of them are great pairing with 5998
post #4319 of 5981

I'm absolutely loving this amp! best thing ive bought in hifi :) this amps in a different league than the Vali amp I just sold with my hd600's I'm playing so much music I never listen to any more. 

I ordered a tung 5998 still waiting for it,   I tried a CV491 / ECC82 Mullard supose to be a really good tube  but prefer the stock hewlett packard 5963 at the mo with stock crack so ordered another 2 ....The tubes that came with my crack stock are the  RCA jan 6080 and hewlett packard 5963 (amp sounds brilliant I'm well happy I wont be buying anything in a while :) ,  I might treat myself to some T1's later.

post #4320 of 5981
Quote:
Originally Posted by lost&confused View Post
 

I'm absolutely loving this amp! best thing ive bought in hifi :) this amps in a different league than the Vali amp I just sold with my hd600's I'm playing so much music I never listen to any more. 

I ordered a tung 5998 still waiting for it,   I tried a CV491 / ECC82 Mullard supose to be a really good tube  but prefer the stock hewlett packard 5963 at the mo with stock crack so ordered another 2 ....The tubes that came with my crack stock are the  RCA jan 6080 and hewlett packard 5963 (amp sounds brilliant I'm well happy I wont be buying anything in a while :) ,  I might treat myself to some T1's later.


Great to see another UK based Crack owner. T1's+Crack make a super combo. 

New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Headphone Amps (full-size)
Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › Crack;Bottlehead OTL