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

Crack;Bottlehead OTL - Page 408

post #6106 of 6116

If anyone wanted to get the Crack + Speedball, now would be a good time with the $299 sale for both. 

 

http://bottlehead.com/?product=crack-otl-headphone-amplifier-kit

post #6107 of 6116

Well I have lost count of how many times my finger has hovered over the buy it now button for the 12au7 to 6sn7 adapter but I finally bit the bullet and headed down the 6ns7 rabbit hole!

 

Its so far so good with my first purchase, a early NOS National Union 6ns7gt black glass and it is proving to be real Cracker! Pleased to report no adapter noise issues either as some have experianced.

 

post #6108 of 6116

I used 6/12SN7 for my CRACK made my own adapter................ 

post #6109 of 6116

Finally got a chance to upgrade my volume pot to a stepped attenuator from ebay. So far I'm really happy with it. balance is perfect at any volume and much detailed and cleaner sound even on lower volume which with the stock volume control I need to crank the volume a 

 

bit more to hear the same details. Then again it might just be in my head :) overall quite happy with the upgrade

post #6110 of 6116


I keep meaning to install an attenuator. Can you post the ebay address.

post #6111 of 6116
post #6112 of 6116
Quote:
Originally Posted by Mahdi8 View Post
 

Finally got a chance to upgrade my volume pot to a stepped attenuator from ebay. So far I'm really happy with it. balance is perfect at any volume and much detailed and cleaner sound even on lower volume which with the stock volume control I need to crank the volume a 

 

bit more to hear the same details. Then again it might just be in my head :) overall quite happy with the upgrade

 

Neat work Mahdi its hard to see in the pic but if you have not done so the left and right grounds on the attenuator need linking together from a safety stand point.

post #6113 of 6116
Quote:
Originally Posted by JamieMcC View Post
 

Neat work Mahdi its hard to see in the pic but if you have not done so the left and right grounds on the attenuator need linking together from a safety stand point.

I believe I see that joint on the 2nd to right ground wire. Looks like grounding was done to the outer ring to connect both grounds. I could be mistaken, as I can't off-hand remember which ground is connected to the top and bottom ring, and the photo is a little blurry at that spot.

 

However, using those spots to solder all the connectors to was quite smart. I used the conventional spots in my Stereomour, and it meant cutting the shielded wire to different lengths. A bit of a pain in the end, and this looks much easier.

post #6114 of 6116

yeap that right I've liked the ground to the outer link I reckon it's going to be a cleaner solder than having a separate cable joining the ground. I didn't do it at first actually and it causes a horrible humming sound

post #6115 of 6116
Quote:
Originally Posted by Mahdi8 View Post
 

yeap that right I've liked the ground to the outer link I reckon it's going to be a cleaner solder than having a separate cable joining the ground. I didn't do it at first actually and it causes a horrible humming sound

It was pretty smart routing them that way.

 

On the Stereomour I ended up with a ground cable that was just slightly too short, so needed to ground it on the outer ring. All of my ground wires were difficult to attach because of the varying lengths between in/out and ground. I never seemed to get the lengths right first time.

 

Interesting comment about the hum without linking the grounding. I wanted to see the difference, but completely forgot to leave out the that connection. On the Stereomour I do not have the grounds connected as the schematic did not call for it, but I have no problem with hum.

post #6116 of 6116

Added the schiit modi, new spiked feet and waxed the wood :tongue_smile:

 

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