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Old 19th January 2019, 10:35 AM   #8701
cbueche is offline cbueche  Switzerland
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Quote:
Originally Posted by thuanth43 View Post
My 845 amp for electrostatic headphones. Double C-Core amorphous output transformers and C-Core power transformer.

congrats for the build. A tube amp is done when they are more capacitors in the power supplies than tubes in the circuit ;-)
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Old 19th January 2019, 06:49 PM   #8702
gabdx is offline gabdx  Canada
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Quote:
Originally Posted by thuanth43 View Post
My 845 amp for electrostatic headphones. Double C-Core amorphous output transformers and C-Core power transformer.
Must be the most awesome headphone amp in the universe!
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Old 19th January 2019, 08:38 PM   #8703
jdg123 is offline jdg123  United States
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Thuanth, that build just makes me smile. Nice work!
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Old 19th January 2019, 11:56 PM   #8704
kissabout2002 is offline kissabout2002  Italy
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Quote:
Originally Posted by PampaAudio View Post
Thank you! Of course there are more pictures

As far as I know the only russan PIO caps that come in that nice blue colour are the 250nF 630V ones.



The circuit is really very simple. The 24A screen grids are connected to the anode with 100 ohm resistors and biased at 2.5mA and 100V, I have attached the tube curves below so you can see. The 45s are biased at 33mA and 250V with a 6K load giving about 1.3Watts.

The preamp tubes are really nice but nobody ever uses them. They are very linear as you can see in the curves, and plentiful and cheap. The biggest downside is the high heater current.
Nice amp simple but very nice
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Old 19th January 2019, 11:57 PM   #8705
kissabout2002 is offline kissabout2002  Italy
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Quote:
Originally Posted by thuanth43 View Post
My 845 amp for electrostatic headphones. Double C-Core amorphous output transformers and C-Core power transformer.
Congrats awesome built
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Old 20th January 2019, 01:42 AM   #8706
thuanth43 is offline thuanth43  Viet Nam
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Quote:
Originally Posted by cbueche View Post
congrats for the build. A tube amp is done when they are more capacitors in the power supplies than tubes in the circuit ;-)
Iím working on another OTL headphone amp with 17 tubes, no more caps on top

Quote:
Originally Posted by gabdx View Post
Must be the most awesome headphone amp in the universe!
Iím very happy how it turns out, have been spending a month just for thinking how to make it look good. Iíve plan for a Sakuma 845 driving 845 headphone amp on mind, but that will take time.

Quote:
Originally Posted by jdg123 View Post
Thuanth, that build just makes me smile. Nice work!
Thank you! Iím still tuning the operation point but so far so far really pleased with it.

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Originally Posted by kissabout2002 View Post
Congrats awesome built
Thank you.
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Old 20th January 2019, 01:59 PM   #8707
mondogenerator is offline mondogenerator  England
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All these awesome builds! So much engineered art!

Hopefully my first complete build will be enclosed in something more aesthetically pleasing than the Danish Butter Biscuit tin!
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Old 21st January 2019, 02:22 PM   #8708
alex mm is offline alex mm  Romania
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Join Date: Mar 2006
Location: Baia Mare ,
Second PP amplifier EL 34 , toroidal mains transformer, and output transformer, from Toroidy Poland. Power 2x50W, distorsion less 1% ,HV=500V .Round, vintage transformer cover, from China, will arrive soon. It's singing now.
Regards
Alex
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Old 22nd January 2019, 09:00 AM   #8709
qiuchun63 is offline qiuchun63  China
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Default 6p3p SE

1.jpg2.jpg3.jpg4.jpg
5.jpg6.jpg7.jpg28.jpg

Last edited by qiuchun63; 22nd January 2019 at 09:14 AM.
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