Desktop Series continued... - diyAudio
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Twin Audio Twin Audio is a manufacturer of hand made audiophile tube amplifiers.

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Old 6th August 2010, 06:01 PM   #1
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Default Desktop Series continued...

It is always very hot during July and August in Hong Kong. The outdoor temperature is over 34 degrees in day. People may not want to listen hot big tube amplifiers in hot summer. The small powered tube amplifiers are not so hot and more safe. So we continue to produce our desktop series. A new baby is coming...
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Old 6th August 2010, 06:17 PM   #2
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What is it?
It is a mini tube amplifier. In the beginning, we designed this 3-tubes amplifier without a tube rectifier. Less heat. Since we succeed to make ECC85-6L6 single end, read Mark's review, we believe ECC85 is able to match 6V6 as well. So we did it, the circuit is more simple, a single ECC85 pushes 6V6 in class A single end. 4.5W output power is achieved at tetrode connection. Thanks Thomas. He made a new nice amp.
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File Type: jpg 6N1-6V6-4.jpg (53.7 KB, 228 views)
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Old 9th August 2010, 06:12 PM   #3
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Direct signal path (one input) is the best.
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Old 12th August 2010, 03:55 PM   #4
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Smart looking.

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Old 12th August 2010, 06:48 PM   #5
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These are RCA smoked glass 6V6GT and Valvo ECC85 I keep. They are well matched and the overall sound of the amp is smooth, detailed and musical when pushing Mark Alpair 6 and CHR-70 bookshelf.
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Old 13th August 2010, 10:36 AM   #6
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The price of this desktop 6V6 SE is USD298 including Chinese 6N1(=ECC85) and 6P6P(=6V6GT). If replace Valvo ECC85 and RCA 6V6GT, just add USD52 with total USD350, you will have wonderful sound.
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Old 13th August 2010, 03:27 PM   #7
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The heavy duty 120W EI 86 power transformer is not hot even for long time use in summer. The choke is 10H/150mA for CLC filter.
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File Type: jpg 85-6V6-09.jpg (810.2 KB, 11 views)

Last edited by Musik007; 20th August 2010 at 04:11 AM.
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Old 14th August 2010, 04:25 PM   #8
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The output transformers used for this 6V6 single end is EI 57 x 30 mm with output 5W.
Primary impedance: 5K
Secondary impedance: 0-4-8 ohms
Primary current: 50mA
Inductance: 26H
Frequency range: 35Hz-20KHz
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File Type: jpg 85-6V6-06.jpg (758.6 KB, 14 views)
File Type: jpg 85-6V6-07.jpg (792.9 KB, 12 views)
File Type: jpg 85-6V6-21.jpg (798.1 KB, 13 views)

Last edited by Musik007; 14th August 2010 at 04:29 PM.
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Old 17th August 2010, 05:02 PM   #9
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AC input: 220V
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Old 20th August 2010, 05:32 PM   #10
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The speaker outputs can be easily selected 4 ohms and 8 ohms on a switch.
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