71A Direct Heat Triode Single End Class A Amplifier - Page 2 - diyAudio
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Twin Audio Twin Audio is a manufacturer of hand made audiophile tube amplifiers.

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Old 3rd May 2010, 05:36 PM   #11
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115VA power transformer in EI 76x50 was used on this 71A SE. The power transformer was made in Poshan, Hong Kong.

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Last edited by Musik007; 12th May 2010 at 03:36 PM.
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Old 6th May 2010, 03:38 PM   #12
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This maple wood frame is hand-made. It is natural color of the wood.
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Old 6th May 2010, 03:45 PM   #13
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The 71A SE is our unique design and was made and soldered by Thomas.
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Old 6th May 2010, 03:54 PM   #14
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We selected German ROE 100uF/100VDC golden capacitors as the cathode caps for 71A and 6SL7.
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File Type: jpg 71A-25.jpg (805.1 KB, 96 views)
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Old 6th May 2010, 04:01 PM   #15
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The capacitors using at the coupling stage between 6SL7 and 71A is CDET 0.33uF/630VDC film caps from USA. The quality of CDET caps is very good. We're using them in some of our tube amps.
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File Type: jpg 71A-30.jpg (808.8 KB, 91 views)
File Type: jpg 71A-38.jpg (814.7 KB, 61 views)
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Old 6th May 2010, 04:19 PM   #16
Decker is offline Decker  United States
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Beautiful! You are giving me GAS!
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Old 6th May 2010, 04:44 PM   #17
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Beautiful! You are giving me GAS!
Thank you.
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Old 6th May 2010, 04:58 PM   #18
kevinkr is offline kevinkr  United States
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Tony, Thomas, very nice work.
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Old 6th May 2010, 05:02 PM   #19
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Tony, Thomas, very nice work.
Kevin,

Thank you so much.

Tony.
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Old 7th May 2010, 08:33 AM   #20
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This is the output transformers for 71A single end. The primary impedance is 5K and secondary impedance is 8 ohms and 16 ohms. The output power is 7W.
I think you mean the output power is ~ 0.7W

I am looking forward to using some of these in an amp project - supposedly, they present music with a nice sense of delicacy and nuance, though can sound (visually) flat at times... We will see.
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Last edited by rcdaniel; 7th May 2010 at 08:36 AM.
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