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Twin Audio Twin Audio is a manufacturer of hand made audiophile tube amplifiers.

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Old 8th April 2010, 06:57 AM   #31
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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.

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Old 21st April 2010, 08:52 AM   #32
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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 ?
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Old 21st April 2010, 02:09 PM   #33
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Hi Andrea,

Please check your PM.
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Old 23rd April 2010, 04:52 AM   #34
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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.

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Old 23rd April 2010, 05:29 PM   #35
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6550:

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Re-issued Genalex KT88:

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Old 26th April 2010, 04:24 PM   #36
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This is also the best work of Thomas.

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Old 29th April 2010, 03:58 AM   #37
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We specially selected Jensen audiophile copper foil copper tube papaer in oil capacitors as coupling caps between 12AU7 and 6550.

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Jensen copper foil copper tube capacitors are heavy.
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Old 6th May 2010, 04:10 PM   #38
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We used audio grade Jensen caps for cathode and filtering. Good performance.
Attached Images
File Type: jpg KT88SEII-52.jpg (139.6 KB, 107 views)
File Type: jpg KT88SEII-53.jpg (136.7 KB, 88 views)
File Type: jpg KT88SEII-45.jpg (130.5 KB, 91 views)
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Old 7th May 2010, 03:17 PM   #39
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Thomas was working at my workshop.
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File Type: jpg DSCN2153.jpg (787.2 KB, 241 views)
File Type: jpg DSCN2154.jpg (788.3 KB, 261 views)
File Type: jpg DSCN2152.jpg (815.1 KB, 284 views)
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Old 18th May 2010, 11:53 AM   #40
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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
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