Head-Fi's Sponsors
(Premier Sponsors bolded) |
|
|
Can Jam '09
(2009
International
Head-Fi Meet)
Impressions,
Reviews, Photos |
Can
Jam '09 graphic
courtesy of Edwood
Click on the links below
for Can Jam '09 photos,
impressions and reviews:
blubliss
1,
2,
3
dallan
1,
2,
3,
4
santacore
1,
2
nhat_thanh
1, 2
vpivinylspinner
1,
2,
3
amb
1
augustwest
1
eaglejo
1
johnsonad
1
shellylh
1
Jon L
1,
2,
3,
4
Germancub
1
zippy2001
1
IPodPJ
1
bhd812
1
Edwood
1,
2
abellaw
1,
2
minidiscs
1
atothex
1
HighLife
1
achristilaw
1
SiBurning
1,
2,
3,
4
SiBurning
5,
6,
7
LFF
1
Iron_Dreamer
1
doping panda
1
morphsci
1
ironbut
1
shaizada
1
jasper994
1,
2
jp11801
1
Uncle Erik
1
drubrew
1
(More impressions/photos
still being added.)
|
|
|
Head-Fi Blogs
and Facebook |
|
|
Head-Fi's Sponsors
(Premier Sponsors bolded) |
|
|
|
03-31-2008, 02:33 PM
|
|
Junior Head-Fi'er
|
|
Join Date: Mar 2008
Location: Kyoto
Posts: 17
|
|
Twilight Tube-MOSFET mu-stage hybrid headphone amplifier
6CG7 + several 2SK213s, mu-follower topology with additional MOSFETs as line smoothers. It took me two years to get around and finish the thing, and the concept - a single tube headphone amp - has been kicking around my head for more than a decade I guess. It ended up a bit bigger than I originally planned, but overall I'm really pleased with how it turned out.
Most importantly, it glows:
When it not glowing, it looks like this:
The insides are pretty messy and look like this:
Finally you can peruse the circuit schematic here: (large, so I wont embed it)
http://i55.photobucket.com/albums/g1...ht_circuit.png
The circuit puts about less than 10W heat including the filament, and gives about 40 mW (calculated limit at 1% distortion) output power into 300 ohms. Hum and noise below 0.2 mV, and inaudible.
Given that you need a 60 V secondary, and ideally the 2SK213s, this isn't ever going to be one for the masses. It's rewarding, though, if you are willing to go this distance with it.
/rjm
|
03-31-2008, 03:07 PM
|
|
500+ Head-Fi'er
|
|
Join Date: Mar 2006
Location: Penang, Malaysia.
Posts: 866
|
|
i cant believe what i'm seeing here, it's absolutely beautiful.
I really really love the simplicity of the circuit. It's...just...elegant.
__________________
No. Nothing to see here.
|
03-31-2008, 05:02 PM
|
 |
Head-Fi'er
|
|
Join Date: Feb 2002
Location: Dallas, Texas
Posts: 81
|
|
Quote:
Originally Posted by rjm003
6CG7 + several 2SK213s, mu-follower topology with additional MOSFETs as line smoothers.
|
Excellent design, and beautiful execution.
Quote:
|
The insides are pretty messy and look like this:
|
Messy? You're kidding, right? I don't know that it could be much better...
Pete
|
03-31-2008, 08:12 PM
|
 |
Headphoneus Supremus
|
|
Join Date: Dec 2002
Location: Salamanca, NY
Posts: 1,851
|
|
Very nice...I'm certainly far, far from an authority on this, but I think it looks like a nice scheme. If pmillett thinks it's a nice design, that only confirms for me that it is. I have a pair of 6CG7's sitting around doing nothing, so I'm going to consider putting one together in the future.
__________________
aka LightMeDark and yhamez on other forums
feedback
|
03-31-2008, 11:23 PM
|
 |
500+ Member:
Never looks a gift amp in the jackhole.
|
|
Join Date: Jun 2001
Location: quivering with anticipation......
Posts: 1,993
|
|
Nice. When will the kit be avaliable? ;-)
__________________
"Beneath my goody-two-shoes lies some very dark socks". - Lisa Simpson
|
04-01-2008, 01:47 AM
|
|
100+ Head-Fi'er
|
|
Join Date: Dec 2006
Posts: 259
|
|
Lovely job, inside and out.
2 questions--
How does it sound?
Does the heat sink get hot? If so, it would make a fine winter amp here in Wisconsin.
F
|
04-01-2008, 04:00 AM
|
 |
100+ Head-Fi'er
|
|
Join Date: Sep 2007
Location: Kenosha, WI
Posts: 339
|
|
Any plans to put the Eagle files on your site? The first two replies on this page sold me on the fact that one way or another, I will be building this amp... 
Last edited by Marzie; 04-01-2008 at 04:01 AM.
Reason: changed posts to replies
|
04-01-2008, 04:49 AM
|
 |
Headphoneus Supremus
|
|
Join Date: Aug 2006
Location: Portland , OR
Posts: 1,573
|
|
The files are posted over @ HW , truly great work imo..dB
|
04-01-2008, 05:41 AM
|
|
100+ Head-Fi'er
|
|
Join Date: Sep 2007
Location: Kenosha, WI
Posts: 339
|
|
Quote:
Originally Posted by dBel84
The files are posted over @ HW , truly great work imo..dB |
Ahh, and here I've been taking a crash course in Eagle for the last 2 hours. Good learning experience, though.
|
04-01-2008, 07:02 AM
|
 |
Headphoneus Supremus
|
|
Join Date: Mar 2006
Location: The Beach, California
Posts: 14,420
|
|
Very nice work!
Do I really need another project? I get the feeling I'll end up with one of these.
__________________
UNCLE ERIK
"If you cannot measure it, you cannot improve it." Lord Kelvin
Orbe SE -> SME IV -> Fi Yph -> Zana Deux/Si2A3
HF-1, HF-2, HP-2, K-1000, K-340, K-240DF, HD-800, HD-414, DT48, MDR-SA5000, MDR-7509HD, ATH-6, Omega II Mk.1, Aperio Alpha 1, e3c
ProAc Response 2.5 (cloned), Verhagen Ribbons, Quad ESL-63, Linkwitz Orion+ (under construction)
|
04-01-2008, 02:27 PM
|
|
Junior Head-Fi'er
|
|
Join Date: Mar 2008
Location: Kyoto
Posts: 17
|
|
Thanks for the kind words. If you have any questions I'll do my best to answer them. Except for "how does it sound?" part. That will have to wait for a bit.
"When is the kit available?"
I realise that was only half-serious, but I don't think the Twilight project lends itself to being packaged as a kit. Too much, like the transformer, is out of the mainstream.
"How hot does the case get?"
The MOSFETs and the source resistor are bolted to the case with a large 4 inch square heatsink on top the whole thing is just pleasantly warm to the touch. Its not even any good as a hot plate to keep my coffee warm.
"Any plans to put the Eagle files on your site?"
I will attend to that shortly. I've just updated the Twilight homepage, basically putting there what I just posted here. I'll do the Eagle files shortly.
/rjm
|
04-01-2008, 07:09 PM
|
|
100+ Head-Fi'er
|
|
Join Date: Sep 2007
Location: Kenosha, WI
Posts: 339
|
|
Anyone able to translate the eagle files to Autocad? I would like to add things to the layout like space for heatsinks, the tube socket, and the wiring that was done point to point. I can get autocad from work, but I don't think we have the "inventor" software that does translation. Anybody else interested in this? Or would it be mucking up a great design?
|
04-02-2008, 06:40 AM
|
|
Junior Head-Fi'er
|
|
Join Date: Mar 2008
Location: Kyoto
Posts: 17
|
|
Quote:
|
Or would it be mucking up a great design?
|
No, definitely not. Its the way it is only because it had to fit on 100x160mm. The point to point stuff isn't that difficult, but it would help to use a terminal strip next to the socket to provide additional lugs for supporting components. I regretted not using one.
Also note that IRF510 do not share the same pinout as the 2SK213, so chances are you'll have to redo large sections of the PCB regardless.
|
04-02-2008, 03:50 PM
|
|
Head-Fi'er
|
|
Join Date: Feb 2002
Location: Dallas, Texas
Posts: 81
|
|
Quote:
Originally Posted by Marzie
Anyone able to translate the eagle files to Autocad?
|
Eagle has a ULP called DXF. Just turn on all the layers, do a "R" to fill the copper, and run DXF.
It will generate a multi-layer DXF file (each layer on it's own... layer...) It can get painfully large for a big PCB.
You can then open the DXF in ACAD, or insert it as a block.
Pete
|
04-03-2008, 08:08 AM
|
|
Head-Fi'er
|
|
Join Date: Jul 2007
Location: Slovenia
Posts: 70
|
|
Beautiful. Are those black resistors Welwyns?
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT. The time now is 11:47 PM.
|
