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

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Old 24th July 2010, 02:11 PM   #31
Musik007 is offline Musik007  Hong Kong
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71A Direct Heat Triode Single End Class A Amplifier
The 71A amplifier was done.
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File Type: jpg 71A-2-01.jpg (795.4 KB, 545 views)
File Type: jpg 71A-2-02.jpg (742.6 KB, 505 views)
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Old 27th July 2010, 02:02 PM   #32
im ming is offline im ming
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ur original version is more pretty, however i need to keep away from children.
good job, i am happy for owning this amp.
0.8w output is more than i need
very nice sound with my 98db full range speaker.
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Old 27th July 2010, 04:54 PM   #33
Musik007 is offline Musik007  Hong Kong
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71A Direct Heat Triode Single End Class A Amplifier
Hello ming,

Thank you very much for selection of my amplifier and nice comments. The circuits of the original version and this new one are same. We upgraded the transformers of the new version and can be seen in the previous page. All the transformers were made in Hong Kong. Furthermore, we used German M-cap Supreme capacitors in the coupling stage between 6SL7 and 71A. Transparence and resolution can be improved. The CMC tube sockets keep good contact with foot pins and are very easy to use.

Cheers!

Tony.

Quote:
Originally Posted by im ming View Post
ur original version is more pretty, however i need to keep away from children.
good job, i am happy for owning this amp.
0.8w output is more than i need
very nice sound with my 98db full range speaker.
Attached Images
File Type: jpg 71A-2-17.jpg (815.7 KB, 463 views)
File Type: jpg 71A-2-19.jpg (808.0 KB, 413 views)
File Type: jpg 71A-2-21.jpg (812.8 KB, 358 views)
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Old 3rd August 2010, 04:40 PM   #34
Musik007 is offline Musik007  Hong Kong
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71A Direct Heat Triode Single End Class A Amplifier
This is the heart of the 71A single end amp. Thomas did it well.
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File Type: jpg 71A-2-23.jpg (812.7 KB, 101 views)
File Type: jpg 71A-2-24.jpg (807.3 KB, 102 views)
File Type: jpg 71A-2-26.jpg (804.0 KB, 97 views)
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Old 13th March 2014, 06:48 AM   #35
mhouston is offline mhouston  Australia
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Default Intermezzo

Finally I got mine built. I wanted to stay very retro. RCA , engraved base UX-171A power tubes. No caps or resistors in the cct. just an input tranni (Hammond inter-stage Nickel core) and output tranni. Bias is provided by 4 X 9V batteries for 36V. Drives my Fostex FE206En speakers OK but with input impedance 400ohms I had to put a jFet backend on a single stage Tube (12AU7) amp.

I used an "80" rec. tube itself from the 1920s and the base is a wooden flower pot base from the 1940s. The top plate is timber and I fashioned it from 3ply. Most of the cct. hangs under the top plate with three trannies in the base. 240V is stepped down then backup by two power trannies, one in reverse. Then there is a filament tranni.
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File Type: jpg Intermezzo_I.jpg (244.8 KB, 99 views)
File Type: jpg Intermezzo_II.jpg (199.3 KB, 89 views)
File Type: jpg Intermezzo_III.jpg (246.7 KB, 65 views)
File Type: jpg Intermezzo_V.jpg (213.5 KB, 69 views)
File Type: jpg IntermezzoSystem.jpg (168.0 KB, 77 views)
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Old 13th March 2014, 06:51 AM   #36
mhouston is offline mhouston  Australia
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Quote:
Originally Posted by im ming View Post
ur original version is more pretty, however i need to keep away from children.
good job, i am happy for owning this amp.
0.8w output is more than i need
very nice sound with my 98db full range speaker.
What speakers did you use?
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Old 19th March 2014, 04:48 PM   #37
Bigun is offline Bigun  Canada
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71A Direct Heat Triode Single End Class A Amplifier
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Originally Posted by mhouston View Post
Finally I got mine built. I wanted to stay very retro.
I love the look of this !
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"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
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Old 19th March 2014, 09:24 PM   #38
mhouston is offline mhouston  Australia
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This is the single stage tube preamp I use with Intermezzo. I added the jFet back end for drive capability.
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Last edited by mhouston; 19th March 2014 at 09:28 PM.
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Old 19th March 2014, 09:28 PM   #39
mhouston is offline mhouston  Australia
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One other image
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Old 19th March 2014, 09:56 PM   #40
mhouston is offline mhouston  Australia
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Musik007: schematic please.
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