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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, 07:59 PM   #21
biju55 is offline biju55  India
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Nice work Salas , lovely.
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Old 7th September 2016, 08:02 PM   #22
buzzforb is offline buzzforb  United States
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Wow. This snuck by. I appreciate another project, as if....
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Old 7th September 2016, 08:15 PM   #23
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
It can be done capacitor coupled output too but I don't recommend it. Everything is audible, very simple signal path, very fast circuit. Couplers spoil it.

(build example by V George)
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File Type: jpg VG_CCG-3.jpg (588.8 KB, 2487 views)
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Old 7th September 2016, 08:40 PM   #24
Bonsai is offline Bonsai  Europe
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Very nice Salas! Looks like a awesome design!
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Old 7th September 2016, 08:42 PM   #25
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
I had question about using 2SK389-V Toshiba. Answer is yes it will work. J3 (with R3 as degeneration) fixes the JFET LTP total current at about 5mA so the IDSS of the monolithic chip won't matter as long as it is >3mA tested per element. What will happen is THD will go 0.00025% but the flat trend will go rising trend. I know because I have tested K170BL and V matched pairs. LSK389 does not go such so much because it has less pF. I have tested that too. Its elements curve matching is visibly worse than uPA though. The NEC behaves closer to 2SK117. Pins order is compatible to Toshiba 2SK389. Don't connect the sub pin to anything or it will hum.
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File Type: pdf 2SK389.pdf (240.9 KB, 169 views)
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Old 7th September 2016, 08:45 PM   #26
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by Bonsai View Post
Very nice Salas! Looks like a awesome design!
Thanks
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Old 7th September 2016, 08:50 PM   #27
evanc is offline evanc  United States
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Salas DCG3 preamp (line & headphone)
Any good/recommended source for the NEC parts?
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Old 7th September 2016, 08:52 PM   #28
pchw is offline pchw  United States
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Salas DCG3 preamp (line & headphone)
Is the Nec uPA68H easier to source than the 2SK389?
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Old 7th September 2016, 08:56 PM   #29
Salas is online now Salas  Greece
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Far more easier. Forgotten part by DIY. I got mine from ebay. There are fat and slim ones. Will take picture for you.
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Old 7th September 2016, 08:58 PM   #30
pchw is offline pchw  United States
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Then start loading them up before the rate hike
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