The Crack is indeed a phenomenal amp for the price.   It was the 3rd headphone amp I built and I have not built another since.   The first two amps are in the closet collecting dust....

Very nice case design.  I like it.

Indeed. Very easy to build.  Just take your time and follow the excellent instructions.      

Any news on the revision?   And, did you do well in those two triathlons?  

Because 100uF was not available at Parts Connexion.   And because that is what Beefy did...   100 uf  capacitors come with the kit.   Quote:  

The speedball went in first and then a day or two later the caps went in.  I didn't spend much time comparing the difference. The tung-sol 5998 tube is the one that really stands out. Its gives the amp more clarity and tighter bass.  My ears really like it.  YMMV.   Quote:  

My ears liked the Tung-sol  5998 tube upgrade the most.  Followed by the large caps.   Quote:  

It was a subtle difference.  I'm still new at this hobby and really don't know how to describe it.  Anyway, it was an inexpensive upgrade.    Quote:  

I finally finished my Bottlehead Crack + Speedball + Upgrades.  Its painted with rustoleum hammered copper and the wood has a gloss finish on it.   Upgrades Speedball Neutrik locking jack TKD 2CP2511 100kohm pot Genuine Sylvania Pilot Light 2.2µF Axon film bypass cap on the last...

I'm just using a grubDAC.   

Quote: Same here.  

My crack + speedball + some upgrades is coming along slowly but surely.   

1st - Audio Technica ATH-AD700 2nd - Sennheiser HD600 3rd - AKG K702

Any updates on the production version?

Its a lapel pin I'm using to cover up a hole I decided not to use.