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tubehunter
14-11-2009, 21:20
Sneak preview

http://i514.photobucket.com/albums/t350/halx00/IMG_4784.jpg

http://i514.photobucket.com/albums/t350/halx00/IMG_4795.jpg

http://i514.photobucket.com/albums/t350/halx00/IMG_4799.jpg

http://i514.photobucket.com/albums/t350/halx00/IMG_4797.jpg

Tripmaster
14-11-2009, 22:42
Looking good!

I have been toying with the idea of building one of Nelson's amps. How does it sound?

Rare Bird
14-11-2009, 22:58
I like the original NAIM style box construction

Themis
14-11-2009, 23:26
This is a lovely amp Duncan !
Is this the bottom or the top view ? (the top, I guess?)

roscoeiii
15-11-2009, 04:09
Wow. Very nice. Most of the Nelson Pass designs have pretty massive heatsinks on them. How hot does your new baby get?

Ah wait, I see that not all of those wires are connected. Well, I look forward to hearing about the heat situation in your gorgeous design.

Ali Tait
15-11-2009, 10:29
Cracking job Duncan! So,how does it sound?

John
15-11-2009, 10:41
Looks great Duncan

Ian Walker
16-11-2009, 19:31
mmmm i was just thinkin Duncs gone quiet,now i know why:)

Giza shout when its ready Dunc.

swampy
16-11-2009, 23:49
How hot does it run Duncan ? Just that my F5 has much larger heat sinks about 4x the size of yours per channel like Mr Pass amps. They get to about 60 deg C at the heat sink and 80/90 at the transistor after it has been on a while. Hot but you can hold your hand on the sinks.

The max operating junction temp of the FETS is around 150 deg C. Not sure what temp they start to shut down though but the current will drop dramatically as it gets to its max temp.

I would use a meter to keep an close eye on those transistors temp.

Nice machine work on the case and cap clamps.

leo
17-11-2009, 17:37
Well I'm still searching for the next amp project, so whats the opinions on the F5? circuit is dead simple
Did you hard wire the output stage Dunc or is it pcb based? any pics?

Nice work btw, I like the way how the psu is housed separate

tubehunter
28-12-2009, 12:19
Well finished this off.

The F5 pcb board based amp ran real hot, too hot. I will need to rethink the case design.
So to utilize this case and power supply I've popped two Tripath TA2022 evaluation boards in. Configured in bridged mode gives me 200watt into 8ohm per channel.
This sounds very good indeed replaced my naim/avondale clone. Sounds very much like a valve amp.

http://i514.photobucket.com/albums/t350/halx00/IMG_4868.jpg

Talking of valve amps I picked this WD Kel84 up real cheap.
I 've breathed on it a bit, sounds great.
All valve from dac chip to output transformer has got something!

http://i514.photobucket.com/albums/t350/halx00/IMG_4847.jpg

My other pictures have been deleted, a Photobucket account screwup:steam: