phonoclone 3 roll call

I've built it already, although slightly different version and p2p. Using with Shelter 901

Care to comment about the sound Peter? Noise level?

There way I have it built, it easily outperforms AR PH-7

Peter - as usual your craftsmanship is more than amazing - it's mind-boggling...

A question for you -- what's the copper plate in the middle for???

Thanks,

It's a shield separating two channels.

Here's the bottom view:

Peter,

As usual excellent work. Have you compared it to any other phono stages?

Jam

P.S. We need more pictures.

In a past I had few versions of Ono and VSPS with TX103 for MC step up, but none of them impressed me so much as this little gem

A friend had a modified Counterpoint SA-9 (that Salvatore raves about), but it didn't sound as good either.

Peter,

I think I will try it with shunt regulators. Thanks for the inspiration.

Jam

Indeed, shunt regulators worked very well for me. I'm using something similar to this: http://www.mneng.net/PDK_Shunt_Regulator_files/schematic1.pdf

What opamp are you using for the RIAA ?

Patrick

OPA627/OPA637

Hi Peter,
I like the way you applied the regulator boards. I have thought about that some times, but didn't find out how to apply the final connections between the boards in case those are in the middle of said boards. This allows for a tight signal and V+/- routing. Nice!
Rüdiger

Peter,

You indicate that you use 627/637 that raise two questions:

I asume 627 first stage and 637 second, correct?

Did you do any decoupling on the opamps

Thanks for the info.

Did you compare 27/37 with 627/637, if so what is your impression the significant difference?

Your geometrical solutions and machining skills always envy me.

It looks great (and probably sounds likewise)

Regards,

Michiel

Yes, 627 is first. Due to a tight layout, there was no need for additional decoupling: BG STD 100/25 is the only cap I used per rail after regulator.

I didn't have a chance to compare 27/37 with 627/637 yet. I used OPA627 in a VSPS and it worked very well there, better than AD797.

You set a high standard...

As usual.

One question... rectifiers in the separate PS boxes with the transformers or are they in the main box. It looks like they are in the Tx boxes, but to be sure, I'll ask.

TIA!

Greg in Mississippi

Yes, rectifiers are in a separate enclosure (MUR860). What you see here are just LM317s and MJE devices

Exceptionally neat, well conceived and implemented Peter!

Shows an all encompassing mixture of knowledge, skill and original conceptual ability.

Hello Peter,

Have you considered offering a kit/PCBs of your phono design?

Regards,
Joe

Yes, actually I did. As a matter of fact I'm working on it right now.

The boards are available already, and I should have BOM finalized really soon too.