Salas DCG3 preamp (line & headphone)

[Yurik_V]

I think that the best will be the third. Transformers at the maximum distance from the analog part.

 

[myleftear]

Thanks Yurik.
inspired me to a fourth variant:
Toroids at the front, into PSU, into Line-Stage, into I-select, into in-/outputs... volume-jig must be "fly-by-wire" technology (muses or elma relay attenuator), as the toroids would be in the way of an extension-rod or the signal-wires would have to cross them...

 

[Salas]

Thank you Salas!
I go with the jets on a bottom-plate (with good, additional passive aeration)
Is one layout technically better than the other?
For its symmetry, I prefer the symmetric layout, but the third option should be working too… (temp issues maybe?)

This narrow box has thick side panels. Why not mount the main board vertically along a side panel. That way you free up floor space for arrangements and heat exchange is more direct.

 

[myleftear]

Oh yes! the vertical option!
Will mock up a bit more...

edit: (Box is a galaxy 2U 230 / 280, the side-panels are extruded aluminium—it's mass isn't very high unfortunately)

 

[Salas]

2U is high enough to mount the DCG3 main board against a side like seen in some power amplifiers

 

[Russellc]

New headphone from mass drop to be delivered today, (HD 6xx) so I need to get a jack for my DCG3.

Is the headphone jack just hot wired from the HP pads on preamp board? This way it is to be always hot? Or is there some switching?

Russellc

 

[Salas]

Hi, its always hot unless you put a switch in the wiring between the jack and the HP board terminals. Let us know how you like 6xx on DCG3.

 

[aubmar]

Thanks Yurik.
inspired me to a fourth variant:
Toroids at the front, into PSU, into Line-Stage, into I-select, into in-/outputs... volume-jig must be "fly-by-wire" technology (muses or elma relay attenuator), as the toroids would be in the way of an extension-rod or the signal-wires would have to cross them...

Was looking at your layout, and I have something similar, except the tx's are on the left because mains in the back and power switch at the front. This arrangement works very well. The main goal was to space the audio pcb as far away from the TX's as possible within the enclosure. I attach an image for your info and use. I you would like any other views just let me know. It is a most incredible preamp.

 

[myleftear]

Very nice and kind, thank you, Aubmar!
As you say, this is pretty much the layout I‘m after, except that I‘ll have to juggle a bit because my box is smallish…
🙏🏻

 

[Russellc]

Now, got a couple of these on the way. Supposed to be here 9/15. We will see!


https://www.mouser.com/ProductDetail/Neutrik/NJ3FP6C-B?qs=6LylQoPC2SsuUooPB2IWPw==

Russellc

 

[Russellc]

Local "Metal by the foot" has some small bars of aluminum that will be perfect for the heat sinks on the shunt power supplies! Then can move existing power supply to new smaller build. Both will have HP jacks soon. Want to try the new headphones out on the DCG3, so far it has been breaking in on my laptop and Audioquest dragonfly Red. Hoping for a jump in performance! Phones are breaking in nicely.

Russellc

 

[Russellc]

My phone jacks strived last night. They are the Neutrik one that locks with the red tab others here have used.

This is my first set of headphones, Confused initially and haven't had time to look into it, saw 3 connectors. Is the third one a ground? Will look back for pics for examples this eve.

Any schooling on it's hookup greatly appreciated! I get it as to the two HP pads on the board, 3rd one is the question I guess.

Russellc

 

[Salas]

Third one is ground. Corresponding to a male phone jack's sleeve when in. You may connect it to both HP channels ground points. In other words two G wires coming from the board HP terminals ending up to the Neutrik socket's third prong.

 

[Russellc]

I see, both sides grounded at same point on the plug. Thanks! Should have this in by this evening. I may put it on the rear panel, the front is 10mm thick face plate.

Thanks again,

Russellc

 

[Salas]

It should have TIP RI GR letters on its back i.e. Tip Ring Ground (sleeve that is). Tip is Lch Ring is Rch.

 

[A Jedi]

An easy way to remember it is the word "large".

Looking at the plug with tip pointing up:

L
R
G

Left
Right
Ground.

 

[Russellc]

An easy way to remember it is the word "large".

Looking at the plug with tip pointing up:

L
R
G

Left
Right
Ground.

Nice!

Russellc

 

[Russellc]

This is my first foray into headphones, and my first headphone set more than ear buds. Sennheiser HD 6xx from mass drop.

I broke them in by leaving them play on repeat a couple days. Been listening a little with phone, and a Audioquest red dragon fly dac.

Wanting to see how they fair with the DCG3!

Thanks,

Russellc

 

[Salas]

You let us know how you like them soon.

 

[Salas]

This is my first foray into headphones

Here's a most classic binaural demo to celebrate the occasion