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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 7th September 2016, 04:20 PM   #11
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by merlin el mago View Post
What about the SQ?
Does not sound like an ordinary preamp. Sounds like a big class A power amp.
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Old 7th September 2016, 04:21 PM   #12
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by Salas View Post
Does not sound like an ordinary preamp. Sounds like a big class A power amp.
Interesting.
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Old 7th September 2016, 04:23 PM   #13
merlin el mago is offline merlin el mago
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What's the reason you make SS in place of tube?
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Old 7th September 2016, 04:38 PM   #14
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
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.
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Old 7th September 2016, 04:44 PM   #15
merlin el mago is offline merlin el mago
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Have you compared vs tube headphones �� amp?
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Old 7th September 2016, 04:47 PM   #16
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
I have compared vs various tube and SS line preamps
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Old 7th September 2016, 05:00 PM   #17
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
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.
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Old 7th September 2016, 08:17 PM   #18
nikosokey is offline nikosokey  Greece
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Great job Nikos!.
Great job like always...
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Titan 2000 ,Cressendo Millenium 2000, P3A ,VSSA ΤΟ3 ,B1 Buffer ,Golmund Mimesis 9.2 Clone ,Preamplifier Dispre 2 - JFET, DCB1 SALAS, D-Reflector, BibFet, Buffalo II,ES9018K2M, Arduino LDR Volume, AK4490 Discrete Mirand Audio,SSHV2, 6V6 Salas Preamp.
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Old 7th September 2016, 08:22 PM   #19
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Thanks
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Old 7th September 2016, 08:35 PM   #20
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Some oscilloscope shots. Bandwidth is 1MHZ with 20kOhm pot at middle value (worst case situation)
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File Type: png DS2_QuickPrint1.png (32.7 KB, 2147 views)
File Type: png DS2_QuickPrint2.png (24.8 KB, 2094 views)
File Type: png DS2_QuickPrint3.png (32.9 KB, 2064 views)
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