Japanese Kiwame carbon film 2W resistors (green color) for audio were used into the audio section of the 6550/KT88 amplifier. The sound of Kiwame resistors tends to be sweet, smooth and detailed. Kiwame audio graded carbon film resistors have a lots of values available and are very good on tube amplifers.
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This is the second 6550/KT88 single end power amplifier we made and sold in 2009. The circuit is new, single one 12AX7 as voltage amplifying stage and single one 12AU7 as cathode follower. The both triodes can supply enough power to 6550 or KT88 and achieve a strong dynamic performance for 12W under single end class A.
This is interior view of the 2nd 6550 SE power amplifier:
An externally hosted image should be here but it was not working when we last tested it.
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I am Andrea Ciuffoli.
I maintain this site, Audio Design Guide , everyday exposed
hundreds of times.
Could you contact me directly to start a collaboration ?
I maintain this site, Audio Design Guide , everyday exposed
hundreds of times.
Could you contact me directly to start a collaboration ?
This is Twin Audio 3rd 6550/KT88 single end class A power amplifier which was made in 2009. The circuit is same as the 2nd one, single one 12AX7 as voltage amplifying stage and single one 12AU7 as cathode follower. The parts used on 3rd one was more audiophiled.
An externally hosted image should be here but it was not working when we last tested it.
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6550:
Re-issued Genalex KT88:
An externally hosted image should be here but it was not working when we last tested it.
Re-issued Genalex KT88:
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