new la-2 pcb

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:grin:

finally finished my working la-2 pcb
printing the boards now.

i got really side tracked with making all the audio paths curved
so i had to do it by hand , :)

well im glad im done


this is the medium skill version


top-of-box.jpg

board-urei-back.jpg

board-wired.jpg

front-one.jpg

back-of-box-and-board.jpg

metering.jpg
 
that must have to been the most beautiful frontpanel I have ever seen!!! :shock: How did you do it?

Will the PCB's be up for sale? If so any preliminary cost?

What did the whole project cost?
 
ah thanks i think the wood is cocobolo wood :grin:

i cut a 2/8 strip on my table saw and cut it to the size of the front panel.
then drilled the front holes on the metal box ,
then traced the holes onto the wood from the back.
and used my drill press for the holes.

the pcb will be for sell , in about a week

have a few being made now to test pcb express,

im shopping around for some other pcb houses now.

ill post once the boards are in.
 
ok, cool so it really is "real wood"

Do you have a parts list or anything like that avalible yet or will that come with the boards?
 
I'm in for a pcb !

Well done driller45 :grin: I've been waiting for this.
COOL front ! :thumb:
 
LA-2a on PCB !!! That's sacrelege... :shock:

No I'm completely kidding. Looks great !!! Nice work on the PCBs :thumb: :guinness: .
 
Yes, but the question much on my mind is:

Did you use C37 laquer on that front panel? :wink:

Nice job! :thumb:
 
[quote author="driller45"]i got really side tracked with making all the audio paths curved[/quote]

Errr... Why??? :?

Peace,
Al.
 
using curved traces ,gives more space between tracks .
vs straight ,

considering the high voltages , i wanted to keep tracks from

riding parallel for to long

so i used curved.


i actually did in in both , straight and curved ,
curved worked very well.


this helped keep things from cross talking or buzzing.

plus looks plain ass cool when your done , :razz:
 
THIS IS GREAT NEWS!!! :thumb:

Nice work man! Count me in for 1 or 2 depending on price...

:guinness:
Fabio
 
[quote author="driller45"]considering the high voltages , i wanted to keep tracks from riding parallel for to long so i used curved.[/quote]

Interesting. How exactly do curved corners in your paths avoid parallelism? Would it be possible for you to post a bit of the artwork that illustrates this? I don't mean to sound confrontational or anything, I've just never ever had any problems with tube PCBs stemming from parallel paths, as long as you leave enough space between the tracks.

[quote author="driller45"] this helped keep things from cross talking or buzzing.[/quote]

How did it help with the buzzing? How did it help with x-talk? Is this a stereo board?

Nice job, BTW! :thumb:

Peace,
Al.
 
Damn, I might have to get me one of these PCBs...

You know, CJ, Kiira, and a few others have spent some time re-optimizing the LA2a for easier to find tubes, and such. I wonder if these projects could be merged somehow...

Look for the LA2a Layout Diagram thread posted by Cayocasta.

Edit: http://www.groupdiy.com/index.php?topic=231
 
pcb-traces-detail.jpg


here is a detail of the curved traces , there is a lot more space
between the tracks vs 45 and 90 degree routing.
it also is one of those a matter of prefrance things .
but to have a 250v trace next to a 6v trace sometimes
creates buzz.
atleast for me it did , i don't have a electrical degree .
so this one was just what worked.
whats cool is the signal path is almost shorter in every way vs.
the point to point version.
ive done this board about 10 times and made 10 prototypes.
this one works the best at this point.
the prototype above is home silkscreened and home etched.
as far as stereo operation , i left a stereo connect pad to
hook up two .
i was trying to figure out how to make a power supply and find a
x-former that would work for stereo version.
i know ADL or someone like that uses one xfrmer for stereo.
(perhaps an all in one stereo board will be next.)

i also have a version of this wich has all the boards seperated ,
the main board being 2.5 inches x 6 inches
then the power board and the metering board ,
i decided to do the first release as an all in one board ,
it helps lose 8 or so wires going off the board .
mainly all the wires are just for the switches/pots and x former.
i wanted to replace the stereo adjust and limiter resposnse
with fixed resistors , but im very unclear how to do that.
i know cj was talking about that .
since their set and forget for single compressor aplications.

it would lose 6 more wires and save 16-20 bucks on PEC pots.
 
[quote author="Consul"]
You know, CJ, Kiira, and a few others have spent some time re-optimizing the LA2a for easier to find tubes, and such. I wonder if these projects could be merged somehow...
[/quote]

That would be REALLY interesting!!! :razz:

Robert
 

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