Elektor's Preamplifier 2012 in 2017

[Rena66]

here I leave the PCBs and the Gerbers available

 

[ICG]

Thanks - that helps a lot.
I've made some measurements with ARTA meanwhile and found that I also have a slight 50Hz mains hum in the phono stage. I suspect that my transformer might be just to close to the phono PCB.

Since I don't have any options to rearrange the components, I am thinking about moving the PSU components to an external box entirely.

An external PSU is a good solution, HF interference could be an issue though.
If the transformer is actually too close, you could alternatively put a metal sheet between the two.

 

[dentarthur]

Is there any sense in making the amp-circuit simpler? Less components = less noise?

Suppose I do not have balanced signals, never adjust bass or treble, and am happy with 2 mono volume-pots so I do not need a balance-pot. What all can be left out?

For treble and bass that is obvious: just leave-out all components that are no longer in the audio path if the tonedefeat switch is activated. (middle circuit)

For the balance this is less obvious: what is the shortest quality-audio path from the input opamp to the volume-pot? Is that as in the 3rd circuit or had I better keep some of those "balance-components" in?

 

[naadbrahma]

here I leave the PCBs and the Gerbers available

Thanks a Lot

 

[naadbrahma]

Anybody Design Cabinet and front and back panel for this preamplifier

 

[Btsblues]

here I leave the PCBs and the Gerbers available

Thank you very much! That helped me a lot

 

[naadbrahma]

Thank you very much! That helped me a lot

/\

 

[chinoy]

If anybody in India has done a run of these boars Id be interested. In buying them. International shipping is kinda pointless.
Else I plan to get them made by Jlpcb. Ps: You dont need a membership to download the gerber files.

 

[naadbrahma]

If anybody in India has done a run of these boars Id be interested. In buying them. International shipping is kinda pointless.
Else I plan to get them made by Jlpcb. Ps: You dont need a membership to download the gerber files.

I Make the Preamplifier and I Have Boards

 

[Gvida]

Hi i am looking for a set of pcbs of the preamp. I Will studio any proposition.

I am located in France.

Georges

 

[calpe]

I have a number of PCB's but i'll need a couple of days to check

 

[Gvida]

HI Calpe
have you checked to see what pcb(s) you have ?
Georges

 

[calpe]

Apologies.
I have new 110650-5, 110650-6, 110650-4.
I also have a 110650-1, components all mounted, but it has a problem, never got round to checking out the problem.

 

[Gvida]

What type of problem ?

 

[calpe]

I really can't remember it's been a few years since I finished that Preamplifier.
If you're interested in the boards I can offer the pcb that has a problem for a reduced price.

 

[calpe]

The boards I have including the one that has a small problem (probably wrong component/value) are yours for £45 + postage costs

 

[calpe]

These are the boards I have.
£45 + postage and they are yours.

 

[Gvida]

HI All

I am new on this topic and would like you is able to help/support any new builder that goes to build this preamp. As Elektor stopped any support this means I need to have someone that can help. Who is able ? Is that still makes sense to use this "kit" or the one supported by Carl or Doug ?

I just wanted to build a good preamp, it will cost money and I do not want to go in no way because it is old or no support available.

Thanks for your inputs

Georges

 

[calpe]

Hi, you will find two threads that have discussed this Preamplifier.
Elektor Preamplifier 2012
Preamplifier 2012 parts
Douglas Self Preamplifier etc

I'm sure the designers Elektor would help you or at least point you in the right direction.