6550/KT88 single end can easily handle loudspeakers over 86dB. The sound is powerful with sweetness and warmth for 6SN7 voltage amplifying stage.
We specially selected high end Jensen capacitors, 0.22uF/630V-pure copper foil aluminum tube, paper in oil with silver leadout, between 6SN7 and 6550. I can feel the smoothness, refinement and details in music which Jensen caps particularly performed.
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.
We custom-made 250W EI power transformer and 50W EI single end output transformers for this 6550 power amp. They are strong.
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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Thanks, Bigun.
We used Mcap 0.22uF/630V film capacitors for coupling and Philips BC 100uF/100V for cathode capacitors into this 6550/KT88 single end power amp.
We used Mcap 0.22uF/630V film capacitors for coupling and Philips BC 100uF/100V for cathode capacitors into this 6550/KT88 single end power amp.
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:
We specially selected Jensen audiophile copper foil copper tube papaer in oil capacitors as coupling caps between 12AU7 and 6550.
Jensen copper foil copper tube capacitors are heavy.
Jensen copper foil copper tube capacitors are heavy.
Hi Thomas,
Which tube amplifier design of yours would suit driving 15ohms Rogers LS3/5a's? As you may be aware some EL34 or 84 pushpull designs (Leak or Radford) have been very popular partner for the LS3/5a.
Please advise or PM regarding your suggestions.
Thanks,
Dan
Which tube amplifier design of yours would suit driving 15ohms Rogers LS3/5a's? As you may be aware some EL34 or 84 pushpull designs (Leak or Radford) have been very popular partner for the LS3/5a.
Please advise or PM regarding your suggestions.
Thanks,
Dan
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