Also consider the Travagans Red with upgraded AD743 opamps which you can buy from HiFlight. He and I are both using one for our K1000, and upgraded the opamps. Although HiFlight says the SAC K1000 amp is the best he's heard for the K1000 or other phones, he says the Red is still pretty nice and he is keeping his as a spare amp.
The Qinpu A-3 from head-direct also does a very respectable job driving the K1000, and the cheap stock tubes sounded better with the K1000 than a $25 matched set of Sylvania 2C51.
The Qinpu A-3 from head-direct also does a very respectable job driving the K1000, and the cheap stock tubes sounded better with the K1000 than a $25 matched set of Sylvania 2C51.





















