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Darren
11-09-2011, 21:10
Hi boys,
I'm thinking( just for fun) of building a line input only pre amp for use in my work system. I'd like it to be as transparent as possible and modest in cost.
The kit should be complete in terms of components and a case should be included ( though the case can be simple - it's at work).
I don't care if it's valve or transistor.
Has anybody built anything like this please? Or knows of something they can suggest?
Thanks in advance!
If I build it.... I'll post some images right here by way of thanks.
Puffin
11-09-2011, 21:34
LDR based pre is IMO the most transparent pre I have ever had. Costs about £15 for the parts, but you have to source them yourself and a transformer (a cheap wallwart is good enough £10) plus you will need a case.

http://i73.photobucket.com/albums/i239/saxonsex/image001-1.jpg
Darren
11-09-2011, 22:21
That looks interesting Puffy. Can you please direct me to a site with more details please?
Puffin
12-09-2011, 12:14
Darren, You can do it all point to point or you can buy a PCB and matched LDR's (or at least you used to be able to) off a guy on Diyaudio. I'll see if I can get you a link.

http://www.buildanamp.com/1-Boards_c3.htm

:)

Rob.
Ali Tait
12-09-2011, 12:56
You could also try Nelson Pass's B1 buffer/pre. PCB can be bought on ebay.
Darren
12-09-2011, 13:08
Thanks Puffy - Much appreciated.
Darren
12-09-2011, 13:10
Hi Ali,
You aint got a link for that have you? Cant seem to find it.
Ali Tait
12-09-2011, 13:22
You're right, none on there at the moment. There was a chap selling on diy audio. Might be worth a look.
Ali Tait
12-09-2011, 13:26
Thread here-

http://www.diyaudio.com/forums/group-buys/147075-gb-dc-coupled-b1-buffer-shunt-psus-291.html
RochaCullen
12-09-2011, 16:03
Hi Ali,
You aint got a link for that have you? Cant seem to find it.

After having a dig around you can buy these things direct from pass labs DIY:

http://www.passdiy.com/store.htm

If you choose to go this route, I'd love to see how you get on. I am DIY'ing :lol: to build my own preamp!
Darren
12-09-2011, 16:38
Hey Rocha,

That looks good. At that basic PCB price it would be rude not to.

Hi Ali,
Reading that thread, the B1 makes a lot of sense........
Ali Tait
12-09-2011, 16:48
Cheers Nathan, I'd completely forgotten about that.

Darren, yes, I'm using one myself currently while the Pre 2 is having some TLC. It's very good, particularly in view of the low cost. The other good thing is it acts as a buffer also, so avoids the usual impedance matching issues of a passive pre.
Puffin
12-09-2011, 19:30
I use a L/Speed into a B1 - Best detail and musicality I have ever heard. There is a good build thread on Audio Circle.

Starts at post 53.



http://www.audiocircle.com/index.php?topic=78312.40
RochaCullen
13-09-2011, 10:45
Cheers Nathan, I'd completely forgotten about that.

Darren, yes, I'm using one myself currently while the Pre 2 is having some TLC. It's very good, particularly in view of the low cost. The other good thing is it acts as a buffer also, so avoids the usual impedance matching issues of a passive pre.

I'd like to do a complete check on the costing of such a project before I kick off, building a couple of gainclone monoblocks was way more expensive than I initially thought it would be.
Ali Tait
13-09-2011, 11:18
It's cases and transformers that push the price up!