srb02
"Infinity Speaker" Man Cave
A new build is up and running.
History behind it: I had built Kegger's KT88 SE UL (6EJ7 version) several years ago. I asked for a pair of KT120's for Xmas 2 years ago, and Santa obliged. They dropped right in and wow, they took this amp to a new level, but it wasn't optimized for the bigger tubes, nor did it have big OPT's.
10 months ago, I decided to do an all-out build for the KT120 tubes.
And here we are: 50 pounds of the most awesome sounding amplifier I've ever had the pleasure of listening to.
Yup, it's downfall is weight. Transformers and chokes alone are 40 lbs. All motor run caps in the power supply, CXSE25-5K 25 watt OPT's, 400-0-400 325Ma Power transformer, B+ = 475.
Kegger helped tweak the layout, designed the power supply, and setup the schematic to get these big tubes to sound their best. This thing just sings. Smooth, powerful, big tight hard bass, the mids are full, real full, and the highs, just unbelievably pretty. Its incredible, transparent really, and sound stage.....WOW.
Your wondering: he's keeps talking about KT120, but it has 150's in. Yup, one of the later conversations the comment was made: If the 120's sound this good, what would the KT150's sound like? And a pair showed up within 7 days... They are "as good as" the 120's. Time will tell, we're letting them burn in, and get some hours, and there might need to be a few tweaks, maybe not.
Tubes: 2-KT150, 2-6EJ7, 2-5AR4 rectifiers.
My two cents Stu
History behind it: I had built Kegger's KT88 SE UL (6EJ7 version) several years ago. I asked for a pair of KT120's for Xmas 2 years ago, and Santa obliged. They dropped right in and wow, they took this amp to a new level, but it wasn't optimized for the bigger tubes, nor did it have big OPT's.
10 months ago, I decided to do an all-out build for the KT120 tubes.
And here we are: 50 pounds of the most awesome sounding amplifier I've ever had the pleasure of listening to.
Yup, it's downfall is weight. Transformers and chokes alone are 40 lbs. All motor run caps in the power supply, CXSE25-5K 25 watt OPT's, 400-0-400 325Ma Power transformer, B+ = 475.
Kegger helped tweak the layout, designed the power supply, and setup the schematic to get these big tubes to sound their best. This thing just sings. Smooth, powerful, big tight hard bass, the mids are full, real full, and the highs, just unbelievably pretty. Its incredible, transparent really, and sound stage.....WOW.
Your wondering: he's keeps talking about KT120, but it has 150's in. Yup, one of the later conversations the comment was made: If the 120's sound this good, what would the KT150's sound like? And a pair showed up within 7 days... They are "as good as" the 120's. Time will tell, we're letting them burn in, and get some hours, and there might need to be a few tweaks, maybe not.
Tubes: 2-KT150, 2-6EJ7, 2-5AR4 rectifiers.
My two cents Stu
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kt120_150_schematic.pdf77.2 KB · Views: 889
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