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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Salas DCG3 preamp (line & headphone)
Salas DCG3 preamp (line & headphone)
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Old 19th September 2018, 07:15 PM   #3141
Johnny Canuck is offline Johnny Canuck  Canada
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Quote:
Originally Posted by Salas View Post
Those are very good DC results but you will also need mid point AC secondary wire(s) for each PSU unit's AC in
Thanks Salas.
Properly wired (!) results shown in the attached photo - embarrassing rats nest of wire but I just used what was close to the top of my wire box.
The final build will use 2 transformers for dual mono as others have done.
-Keith-
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Old 19th September 2018, 10:52 PM   #3142
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
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Originally Posted by Marra View Post
Thanks Salas.
The wires are silver plated 19/0.25 18awg.
Maybe thicker cable #14, in shorter runs if possible, deserves a try at a point.
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Old 19th September 2018, 10:54 PM   #3143
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by Johnny Canuck View Post
Thanks Salas.
Properly wired (!) results shown in the attached photo - embarrassing rats nest of wire but I just used what was close to the top of my wire box.
The final build will use 2 transformers for dual mono as others have done.
-Keith-
Everything looks & tests good with your supply build.
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Old 20th September 2018, 02:21 AM   #3144
nashbap is offline nashbap  United States
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Originally Posted by Marra View Post
The Ultrabibs are now installed in my DCG3 pre and running somewhat cooler than I was expecting. Both are set at +- 17.1vdc. Time for some music.

Looking good! What are you using as heatsinks for the Ultrabib? Cant figure them from the pics. Did you have dual DCSTB's before this?


Nash
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Old 20th September 2018, 09:08 AM   #3145
Marra is offline Marra  United Kingdom
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Salas DCG3 preamp (line & headphone)
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Originally Posted by Salas View Post
Maybe thicker cable #14, in shorter runs if possible, deserves a try at a point.
I will give it a try.
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Old 20th September 2018, 09:12 AM   #3146
Marra is offline Marra  United Kingdom
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Salas DCG3 preamp (line & headphone)
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Originally Posted by nashbap View Post
Looking good! What are you using as heatsinks for the Ultrabib? Cant figure them from the pics. Did you have dual DCSTB's before this?


Nash
The heatsinks for the Ultrabib are U section alluminium which is 6mm thick.
I have two DCG3's one powered by the DCSTB's and one now using the Ultrabibs. It was run from SLB1.1's originally.
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Old 20th September 2018, 09:14 AM   #3147
SpyNet is offline SpyNet  Greece
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DCSTB vs Ultrabib?
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Old 20th September 2018, 09:28 AM   #3148
Marra is offline Marra  United Kingdom
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Salas DCG3 preamp (line & headphone)
A comparison in progress
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Old 23rd September 2018, 09:34 AM   #3149
zman01 is offline zman01  Bangladesh
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by ggetzoff View Post
Salas,

As far as pots go, I usa a dact type with smds. It's very neutral and transparent. I only have 2 values on hand: 10 and 20k. I switched to 10k and it is almost perfect. I know this is isn't in the proper range for your design, but it really works well for me. Now, I can do what you said and change R1 and go back to 20k. In fact, its the same pot I used with my DCB1 for many years, with no harshness or glare; very smooth sounding.

My 2 channel room has never been bright. What i'm hearing is definitely a component change. With the 10k, I can now enjoy and listen. It really is a truly phenomenal preamp. But, I need to address the slight sibilance I'm hearing. So, I'm all ears for suggestions.

Unfortunately, my tube dac has a very high output impedance of 20k. So, would 50k not be way too bright if 20k was so? I'm open to any suggestions because I love this thing otherwise. There has to be a fix with either a pot and or R1. Maybe a trimmer on R1 to adjust tone? Or would that be stable?

Cheers,

Greg
Greg,

Hope you are enjoying the music (big time)!

Are you still using the 10K pot or tried out other values (20K and 50K) and liked them more?

I am planning to order the same type DACT 21 step attenuators from eBay.
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Old 23rd September 2018, 02:31 PM   #3150
ggetzoff is offline ggetzoff  United States
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Salas DCG3 preamp (line & headphone)
Zman,

I'm using a 20k. Made a slight speaker adjustment, no more brightness. In my setup it now sounds just about perfect, basically is slightly on the brighter side neutral. I was getting slap reflections which really made the DCG3 sounds very bright.

I haven't listened to the HP OPS, but that would be the smartest way to evaluate this design.

Anytime I hear something I don't like in my listening room I pull a studio monitor out and listen to the same track with a good source. What you realise in those moments is that your room is trashing all of your efforts.

It's funny how the "digital glare" moniker is used. In my case "digital glare" is simply my crappy room or improper speaker placement.

Amazingly, my phone (LG V20) with a Sabre dac built in has zero digital glare with headphones. Nothing bright at all, just enjoyable with both detail and warmth.

I use really simple house curves for my listening rooms, via Roon and it's built in PEQ and its convolution engine.

Having said all of that, and knowing all of that, I still made the mistake of trying to adjust the DCG3 over the room.

Hope this helps.

Cheers,

Greg
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