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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 13th April 2019, 02:59 AM   #3761
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
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Originally Posted by vodomore View Post
The picture is not complete
Old & new
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Old 13th April 2019, 03:49 AM   #3762
vodomore is offline vodomore  Canada
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Old & new
Thanks Salas.
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Old 14th April 2019, 01:06 PM   #3763
killie99 is offline killie99
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I've bought a kit of parts for a DCG3/DCSTB and iSelect off a member. It's been supplied with 2 x 40VA dual 17V Toroidy transformers, are these ok to use or do I need 50VA?
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Old 14th April 2019, 01:17 PM   #3764
vodomore is offline vodomore  Canada
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Originally Posted by killie99 View Post
I've bought a kit of parts for a DCG3/DCSTB and iSelect off a member. It's been supplied with 2 x 40VA dual 17V Toroidy transformers, are these ok to use or do I need 50VA?
Should be good. 30va x2 is enough, more is for lower temperature and stability
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Old 14th April 2019, 01:44 PM   #3765
killie99 is offline killie99
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Thanks ��
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Old 15th April 2019, 11:28 AM   #3766
transcendent is offline transcendent
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Almost finished the build. Cannot comment much on the headphones end yet, I should get my HD 58x jubilee's in June so will have to wait I did test basic headphones and it works fine. Anyways, the line out to ZM babelfish and pair of markaudio alpair custom speakers sound fantastic. Feels more clarity and tighter bass. Thanks Salas !

Attaching few photos. I know - the wiring is terrible, it looked better on paper Also I had to make some hacks to attach the input switch and volume attenuator to that thick front panel. But hey, it's not about looks, it's about the sound in the end

I am still bit worried about the UBib heatsinks though, with closed lid after few hours I got ~60 degrees. I can barely touch the sink. Is that temperature still manageable?
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Old 15th April 2019, 03:04 PM   #3767
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Congratulations. The jubilees are good, you gonna like them. Not very airy but mostly tonally correct and bodily.

60C is very manageable for the semiconductors. What you want to know is the electrolytic capacitors temperature. Especially the ambient in vicinity of 85C rated caps.
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Old 15th April 2019, 06:36 PM   #3768
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60C is very manageable for the semiconductors. What you want to know is the electrolytic capacitors temperature. Especially the ambient in vicinity of 85C rated caps.
Thanks, I'll monitor the temperature for a while.
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Old 15th April 2019, 07:27 PM   #3769
pidesd is offline pidesd  Canada
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Quote:
Originally Posted by nounouchet View Post
Hi,


I shorted two led and i have 13,7V. It's perfect for me.


Thanks
nounouchet
fantastique!
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Old 16th April 2019, 12:44 PM   #3770
killie99 is offline killie99
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I have another question regarding the Toroidy transformers. What wires need to be commoned on the output? The 2 outputs are 2 red wires and 2 black wires - how do I know which of the red and black wires I common? 1 each of the red and black pairs has a bit of sticky tape on them (as does 1 of the blue input wires). Grateful if someone who has used Toriody transformers can give me a pointer. Thanks.
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