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#1 Sakuma inspired headphone amp

Posted: Wed Jan 14, 2009 1:25 am
by Nick
Well, if its worth doing, its worth taking to excess.

One chan of the 211 headphone amp project

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#2

Posted: Wed Jan 14, 2009 9:20 am
by shane
This confirms what I've long suspected.



















They're not all locked up yet.....


:D

#3

Posted: Wed Jan 14, 2009 10:06 am
by pre65
I bet matron,and the white coat men are impressed !

What's your visiting day ? :lol:








PS i doff my cap to you for this one !! :wink: :)

#4

Posted: Wed Jan 14, 2009 11:09 am
by simon
Fabulous Nick, fabulous. Oh, how does it sound? :).

#5

Posted: Wed Jan 14, 2009 11:48 am
by andrew Ivimey
does it matter!?

#6

Posted: Wed Jan 14, 2009 11:50 am
by Dave the bass
All that runs off a PP3 battery does it?

Blimey.

DTB

#7

Posted: Wed Jan 14, 2009 12:38 pm
by Nick
Fabulous Nick, fabulous. Oh, how does it sound?
Well, I have only heard it on the OB's yet (need to take my headphones home tonight), and of course in mono, as I have only built one chan, but I think very nice, hugely "organic" to use the description elsewhere. I think it might sound very very nice on SteveS's spekers as its only good for 6 or so watts (its aimed at powering AKG1000 as well as normal phones).

Things to do include get the noise/hum on the output down to 30uv, which I think will give me a 80dB S/N ratio with normal phones, and decide if it needs a optional 801 stage before the first 211. The idea is to use the 801 for the AKG phones, and bipass it (and power down) for normal headphones.

Its intended to be a two box design, so that will help on the noise front.

#8

Posted: Wed Jan 14, 2009 12:46 pm
by simon
Nick wrote:Its intended to be a two box design, so that will help on the noise front.
Packing crates for boxes? :D

#9

Posted: Wed Jan 14, 2009 1:00 pm
by Nick
simon wrote:
Nick wrote:Its intended to be a two box design, so that will help on the noise front.
Packing crates for boxes? :D
They are still boxes :-)

#10

Posted: Wed Jan 14, 2009 1:17 pm
by simon
I quite like the thought of two huge boxes sat in the living room, especially if they hummed quietly when anyone approached them :lol:. Some may think it's a bloke thing, but I like to think of it as an uncompromising approach! I think it's ever since I went to Japan and saw big boxes in hi fi shops.

#11

Posted: Wed Jan 14, 2009 2:19 pm
by Nick
I still remember seeing a pair of 833 amps at a hifi show about 6 years ago, they were about the size of half filling cabinets. Not sure if they sold any though. I was musing about building something around a 450tl or similar, but housing the entire thing in a perspect case so it was all visable.

#12

Posted: Wed Jan 14, 2009 2:30 pm
by andrew Ivimey
The perspex would sag!

And, that's only one channel is it..sort of..'so far', or so far out. :wink:

#13

Posted: Wed Jan 14, 2009 2:38 pm
by Cressy Snr
Crazy :D :D :D

I love it!

#14

Posted: Wed Jan 14, 2009 2:41 pm
by Nick
Yep, just proving the idea will work. I don't have enough space to build both on a board, so I will have to try getting some into a chassis just to try both chans. I should have space to add the 801 stage if needed.

I imagined a bunch of structural beams and planes supporting the various bits of perspex. Maybe it would be in place in space 1999.

#15

Posted: Wed Jan 14, 2009 9:16 pm
by Toppsy
Nick,

you'd be wanting to use Cast Acrylic (perspex) then as oposed to the hot rolled stuff. The cast is much much structurally sound.