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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 28th March 2020, 10:16 PM   #4551
savvas is offline savvas  Greece
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Quote:
Originally Posted by Salas View Post
I have had good experience with circular ones but when with rather short pins left on the semis.
I thought that all circular pin sockets for chips are about the same more or less or at least big enough for transistors legs (TO 92) to fit tight but it's not the case with some
I had to desolder them because the transistors were much too loose (thank the Almighty I have a desolder machine and GB pcbs are top quality)
It's better to be on the safe side and not to worry if a blowing by the wind throws your transistor off the board.
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Old 28th March 2020, 10:25 PM   #4552
JOIMONF is offline JOIMONF
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Now I'm populating the dcb3 board, I see parts kit for R4, R5 a Dale 33R2, and wonder if makes sense replace them to a somewhat higher value 43R but higher quality tantalum resistor that I have without use.
Lukily I have also in spare bin Vishay naked TX2352 for important places as R1, R6 and R15.

Last edited by JOIMONF; 28th March 2020 at 10:27 PM.
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Old 28th March 2020, 11:20 PM   #4553
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
The 33R2 are MOSFET gate stoppers in the DCG3 meaning virtually no current through them, just dampers. Do as you like, 43R is permissible there as far as I remember from the development tests. Tantalum resistor is thin film non inductive enough so its alright.
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Old 29th March 2020, 08:07 AM   #4554
JOIMONF is offline JOIMONF
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Thanks!
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Old 29th March 2020, 08:57 PM   #4555
Siberia is offline Siberia  Lithuania
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Join Date: Feb 2011
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Salas DCG3 preamp (line & headphone)
I encased mine today, as I've been listening to it over 3 weeks already and I absolutely loved it. Precise, in control, very reavealing. Japanese knife type when with SMD 20K stepped pot and monitorish headphones. When with my fresh DIY FL speakers and a current feedback AB/A type amp it made me experience almost spooky presence moments during some musical passages. Now it is test running a TKD pot together with the speakers. And it makes me appreciate a tone correctness of some live instruments with a smile. The speakers need some tuning, so I can't tell the final word which pot is here to stay. More discoveries are waiting

The build was sans glitch. The documentation was clear and top notch. I'm very grateful to Salas, Tea-bag and the community.

Can't be streesed enough, Diyaudio is a truly special place on the net. The internet was built for the Diyaudio, not the other way around. The knowledge that is shared here is overwhelming and priceless. I've been to many online communities, but for me this place is a reference in terms of many things.
And of course, Salas is one of and also THE gem of this kingdom. Thank you, Nick, for everything.

All this to say, if you're on the fence of building this, go for it!

Some DCG3 pics with my audio family.
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Last edited by Siberia; 29th March 2020 at 09:15 PM.
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Old 29th March 2020, 09:43 PM   #4556
donhughes111 is offline donhughes111
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Amen
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Old 29th March 2020, 11:06 PM   #4557
savvas is offline savvas  Greece
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Bravo !

Our time is gonna come
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Old 30th March 2020, 06:46 AM   #4558
alexkosha is offline alexkosha  United States
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Salas DCG3 preamp (line & headphone)
Agree with every word. Congratulations!!!
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Old 1st April 2020, 07:42 PM   #4559
JOIMONF is offline JOIMONF
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I have eight 2sk170
Hfe:
666, 677, 732, 794, 829, 980, 1049, 1216
Please Salas, which ones are best pair for J1/J2 ?

I see on datasheet 1-d / 2-g / 3-s,
But on circuit board order pinout is different, drain hole is in between. Maybe Ok. Just wanted to confirm if I need to bend the Drain lead.

Last edited by JOIMONF; 1st April 2020 at 07:59 PM.
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Old 1st April 2020, 08:18 PM   #4560
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
2SK170 is a JFET thus it can't have Hfe, that parameter is for bipolar transistors. Maybe you mean something else?

There is no need to bend their pins for proper orientation, you just face one 2SK170 the other way from the next. Board for uPA68 is DGS SGD with a no connection SUBstrate pad in between.
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