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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 2nd April 2020 04:26 PM

When looking like the right hand photo's top FET's face are originals

merlin el mago 2nd April 2020 04:29 PM

Thanks Salas I bought to a reputed Germany ebay seller.

Salas 2nd April 2020 04:30 PM

Quote:

Originally Posted by merlin el mago (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone-post6144769.html#post6144769)
Salas so he can use 6,6/6,7/7,4/8,1?

He can if he doesn't have better second pair

Salas 2nd April 2020 04:33 PM

Quote:

Originally Posted by JOIMONF (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone-post6144788.html#post6144788)
An extremely pleasant high end sound experience.
Not complaints on using uPA jfets, just for fun wanted to try that Japanese Toshiba thing.

Very good. Yes try, you may like 2SK170. uPA68 is NEC NOS from same country by the way. But more alike 2SK117.

Oracle1 2nd April 2020 05:47 PM

About the pot,
i have an ALPS 20K,
an Allo Ladder type 10K stepped attenuator
and i am going to buy a TKD (Ko-on) 2CP-601 20K dual log taper potentiometer


which is best?


Oracle1 2nd April 2020 05:47 PM

sorry for the Bold

Marra 2nd April 2020 05:50 PM

Quote:

Originally Posted by Salas (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone-post6144723.html#post6144723)
Yes you can but for Q1 Q2 prefer BC327-40 IMHO.

Sorry I meant to ask this in the Ultrabib thread:o

Eslheadphone 2nd April 2020 06:59 PM

I used the Allo Ladder type 10K stepped attenuator in my preamp it works very well

merlin el mago 4th April 2020 11:40 AM

Salas what's the best SQ 117GR or 170BL? About Idss higher than >4mA but wich one it's the best 5mA, 6mA or higher or it's better near 4mA?

Salas 4th April 2020 12:25 PM

There is no better IDDS pick if enough. Because the BF256 CCS at their tail forces about 2.5mA in each. Transconductance (Yfs) is the same at 2.5mA for higher or lower IDSS spec if above 4mA threshold anyway.


2SK117 (or uPA68) has lower Yfs and lower pF than 2SK170. Shows the flat THD sweep of post #1 with either 117 or uPA. With 170's more Yfs internal gain of DCG3 (OL) gets higher, THD falls even lower because of more feedback due to that open loop gain, but its sweep tends upwards towards HF because more pF. Sounds different. More forceful. uPA68 & 117 almost same sound more gentle. With K170 more push of body and detail.


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