I have both SET amps. Both are custom made with high quality parts. The kt88 SET amp is using Shuguang Treasure 'Black bottle" kt88-z output tubes and NOS Raytheon 6sl7 "red base" driver tubes and Sovtek 5ar4 rec tube. This is a stereo amp. The circuit is from JE Labs. The 300b SET is in mono block form. It has Sophia electric Princess 300B carbon plate output tubes and the circuit employs a 2 stage driver consisting of vintage type 27 and type 56 tubes. It uses tung sol 5u4g rec tube.
The kt88SET has better top end, sounds a little smoother. The 300b SET has better bottom end (not as slow) and mid bass. Both amps have that magical midrange that I love but the 300b is more lush and renders voices with a more realism. The kt88 does a real good job of projecting a holographic and realistic soundstage. The 300b does also but it is deeper with more air around the voices, it has a higher spooky factor, especially with the lights off. The kt88 SET is still a sweet sounding amp and does voice better than any other amp(besides my 300b amps) that I have heard, that include high end SS amps PP tubes too. both of these amps blows away my Single ended SS amp "Pass Labs aleph 3" amp. One thing nice about the kt88 Set amp is I can also roll tubes, I got a pair of vintage Telsa el34 coming.
The kt88SET has better top end, sounds a little smoother. The 300b SET has better bottom end (not as slow) and mid bass. Both amps have that magical midrange that I love but the 300b is more lush and renders voices with a more realism. The kt88 does a real good job of projecting a holographic and realistic soundstage. The 300b does also but it is deeper with more air around the voices, it has a higher spooky factor, especially with the lights off. The kt88 SET is still a sweet sounding amp and does voice better than any other amp(besides my 300b amps) that I have heard, that include high end SS amps PP tubes too. both of these amps blows away my Single ended SS amp "Pass Labs aleph 3" amp. One thing nice about the kt88 Set amp is I can also roll tubes, I got a pair of vintage Telsa el34 coming.