I received and built my Crack about a year ago and have never enjoyed headphone listening more than I do now. My Crack isn't stock, but nothing not mentioned somewhere on this forum either. My Crack, with HD600's and Cardas cable, is pure sonic joy.
My build, beyond stock, consists as follows
Speedball
Tung Sol 5998 output tube
Millard CV4003 12AU7
1st and 2nd power supply caps replaced with 470uF caps
3rd power supply cap bypassed with a film cap
Triad CX7 choke in power supply
Output caps bypassed with Teflon caps
PEC 100k ohm audio taper volume pot
Cardas RCA jacks
Padded down volume control
Really isn't too much to do, if I choose to do any more. All I can think of is a different headphone jack or film output caps. I would likely tackle the audio output caps first.
« Last Edit: May 17, 2015, 03:02:30 AM by Nathan »
Crack/Speedball, SEX 2.1/C4S, Bryston BHA-1
Sennheiser HD600/Cardas cable, Beyerdynamic T1 2nd Gen, Hifimam HE560/Hifiman balanced cable