# Bottlehead Crack OTL AMP (Kit/DIY) - Official Thread **URL:** \ **Category:** DACs and Digital\ **Tags:** diy, bottlehead, kit\ **Created:** [August 21, 2018, 4:27pm UTC](https://forum.headphones.com/t/bottlehead-crack-otl-amp-kit-diy-official-thread/1937 "2018-08-21T16:27:23Z")\ **Posts on this page:** 1\ **Showing post:** 283
**Author:** ![Wes\_S](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.headphones.com/wes_s/32/11378_2.png) [@Wes\_S](https://forum.headphones.com/u/Wes_S)\ **Post date:** [April 27, 2021, 8:47am UTC](https://forum.headphones.com/t/bottlehead-crack-otl-amp-kit-diy-official-thread/1937/283 "2021-04-27T08:47:31Z")
Would be helpful if you could identify the tubes you are currently using, and I will be more than happy to suggest a better tube. I have rolled them all in the BHC with Speedball, and can give some sound advice, once we figure out what you are currently rolling. That chart above is a good reference, but it does not cover them all. The power tubes listed by @krack are good recs, and any of them would be a good place to start, and then the driver is where you fine tune. I also suggest the Bendix 6080WB graphite plate for a the power tube, if you really want to wake things up and get some dynamic punch and amazing air and seperation. This is my #1 recommended driver tube, if you are looking for the ultimate transparency. > **[Sylvania Gold Brand 5814 Triple Mica - Tube Maze](https://tubemaze.info/sylvania-gold-brand-5814-three-mica-2/)** > > We tried a ton of NOS USA and also European tubes against this tube. In the end, this one, as we put it, “fit like a glove”. Though this tube comes in both three and two mica, we found the two mica to be the better tube. --- _[View the full topic](https://forum.headphones.com/t/bottlehead-crack-otl-amp-kit-diy-official-thread/1937)._