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-   -   Salas DCG3 preamp (line & headphone) (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone.html)

Salas 7th September 2016 04:20 PM

Quote:

Originally Posted by merlin el mago (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone-post4823347.html#post4823347)
What about the SQ?

Does not sound like an ordinary preamp. Sounds like a big class A power amp.

merlin el mago 7th September 2016 04:21 PM

Quote:

Originally Posted by Salas (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone-post4823367.html#post4823367)
Does not sound like an ordinary preamp. Sounds like a big class A power amp.

Interesting.

merlin el mago 7th September 2016 04:23 PM

What's the reason you make SS in place of tube?

Salas 7th September 2016 04:38 PM

I had those uPA NEC monolithic JFET flatpacks that had very nice curve matching consistency and I wanted to test ideas around them. So I beavered away for one and a half months and there it was. But I tested everything I had, even LND150 mini MOSFETS. The board has LSK389 positions too because not NOS. Closest to uPA THD profile. But uPA are still cheap and available because nobody uses them.

Has a sound smooth as tubes no worries. But combining resolution better than DCB1 even. See how it goes second harmonic as the load gets heavier in the THD attachments. Its the single ended output stage MOSFET nature. 100-150mA bias and virtually zero Ohm output impedance gives bass slam and definition too.

The headphones sound easily more alive bigger and smoother than they did on my Benchmark DAC1. Swiss knife preamp.

merlin el mago 7th September 2016 04:44 PM

Have you compared vs tube headphones �� amp?

Salas 7th September 2016 04:47 PM

I have compared vs various tube and SS line preamps

Salas 7th September 2016 05:00 PM

1 Attachment(s)
Here is IMD SMPTE when driving 120 Ohm for instance. That's strong 250Hz trying to modulate quieter 8kHZ. See the little bass tone modulations around the high tone's base. 0.0027% modulation at 101dB SPL with those AKG. Means clarity in busy music. Not easy to do that with SE tube headphone amp.

nikosokey 7th September 2016 08:17 PM

Great job Nikos!.
Great job like always...

Salas 7th September 2016 08:22 PM

Thanks

Salas 7th September 2016 08:35 PM

3 Attachment(s)
Some oscilloscope shots. Bandwidth is 1MHZ with 20kOhm pot at middle value (worst case situation)


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