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PostPosted: 23 Dec 2015, 06:19 
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Joined: 06 Jun 2008, 18:23
Posts: 4867
Location: Australia
A guy on Stereo Net Australia (SNA) bought the Bottlehead HP amp and was looking for some one to assembles it. It turned out there was a lot more than just a tube amp assembly. He also ordered the speed ball SS constant current (guess that is what it is for) upgrade. Three cct. brds. bases to sand and varnish and top plate to prep, prime and paint - it worked out far more than I had quoted. Generiously he doubled my assembly quote. There is a hell of a lot of work in it.

What I would like to say is the HP amp does sound really good and would recomend it to anyone. The SpeedBall upgrade may be the big difference. Bass was excellent but 32ohm HPs may just strain it a little when played loud.

I have teased the owner with lots of images of underneath but nothing of the top plate. That is because I selected the colour or in this case tone. He has no idea. Images to follow.

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Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
Website: retro-thermionic


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PostPosted: 23 Dec 2015, 06:37 
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Single image if the engine room.
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image.jpeg


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Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
Website: retro-thermionic


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PostPosted: 23 Dec 2015, 13:42 
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Joined: 08 Aug 2009, 03:11
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Location: Chilliwack, BC
Doc's circuits sure are advancing. Wonder if he got a new designer?

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-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
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PostPosted: 23 Dec 2015, 16:39 
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Joined: 06 Jun 2008, 18:23
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Location: Australia
I haven't been following him so have no idea.

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Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
Website: retro-thermionic


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