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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 Today, 07:09 AM   #3011
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
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Originally Posted by ggetzoff View Post
Salas,

Got everything working. It has been running for a couple of days now. Absolutely amazing pre. Still a lot of hours of break-in, but these are my mods so far.

1. BC327-40 (per post # I don't remember)
2. BJT, fully discrete op-amp (huge soundstage and smoothness increase)

This is by far the best pre I have ever heard. Still a bit bright. So let's see how it does.. Very dynamic, a lot of micro detail. Not as emotional as the BA-3, but way more interesting to listen to. It's just a treat to listen.

I will do a full review later.

A huge thanks to both Salas and Tea.

Cheers,

Greg
Hi Greg

Its ~1MHz fast right now with a 20K pot (post#20 scope pics) and if your system's tone has been formerly tuned around a softer rise-time incoming signal it may sound fast/bright. In most builders systems here its agreed as tonally neutral around the 20k pot mark. With one or two notable exceptions who decidedly preferred 50k. The loudspeakers tone and their room position being the more influential factors.
In any case try a 50k pot if handy to get the feeling. Maybe its all you need. But if it will lean toward a too soft/round opposite, change R1 on DCG3 from 3.3k to 6.8k so to make it behave like seeing a 34k pot when using a 20k pot. That may hopefully be your point of preferred tonal balance. Also there are build quality differences between pots, like a 20k budget switcher pot is subjectively sharper than a 25k Goldpoint etc. The pot's value and quality is intentionally a tuning area in this pre, there is no source impedance active buffering, so see it as a matter of system synergy/personal preference and its up to you. Even a carbon track super cheap Alpha pot may prove to be your leaning. No wrongs.
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Old Today, 12:07 PM   #3012
ggetzoff is online now ggetzoff  United States
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Salas DCG3 preamp (line & headphone)
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.

Cheers,

Greg
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