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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 10th January 2020 07:26 PM

Quote:

Originally Posted by bubba177 (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone-post6039622.html#post6039622)
Salas I put the BC327-40’s from Diotec in. They are not coming out! Everything sounds more fleshed out, just overall better. Thanks mark. P.S. working on another DCG3 now for office system!

Nice. I prefer them in my system too. Show us your new build when ready.

Oracle1 17th January 2020 11:51 PM

May i ask, in DCG3 can i use the psu of yarra preamp ?

Salas 18th January 2020 01:02 AM

You can use any +/- 17V +/-300mA capable PSU you trust and like.

savvas 18th January 2020 11:58 AM

Quote:

Originally Posted by Oracle1 (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone-post6048499.html#post6048499)
May i ask, in DCG3 can i use the psu of yarra preamp ?

Fellow member filenet did just that and he's happy with the results

bubba177 21st January 2020 04:32 PM

Salas, working on second preamp build, would 1.74k be alright for gain resistor ? To get 4x plus ? 3 x feeding burning amp Wide open is normal listening level. Need just a little more. Also what is the lowest resistance you would go to get close to unity gain when driving an F5. Try around 400 ohms? Thanks Mark

Salas 21st January 2020 09:56 PM

1.74k will give ~4.5x gain. It won't oscillate with more than usual gain setting, its ok.

499R would be the lowest. 2x gain. Further down its dangerous to act up. I don't guarantee it will stay stable. Unity it does not do for sure. You could try push it to 1.5x but you should fully check on the bench it still works calmly with gen & scope on sine and square.


P.S.

The gain formula is 1+(R6/R7)

Oracle1 22nd January 2020 08:06 AM

Salas how you didnt desing a power amp so we are going to have a SALAS complete system?

jimk04 22nd January 2020 08:21 AM

Quote:

Originally Posted by Oracle1 (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone-post6053892.html#post6053892)
Salas how you didnt desing a power amp so we are going to have a SALAS complete system?

A question I have been wanting to ask!

Salas 22nd January 2020 09:21 AM

2 Attachment(s)
There was a KT88 trioded tube amp I had actually designed :D

Many speakers also. Including professional installation types

Anyways, for electronics I generally designed what I missed or to put interesting or expensive lying around parts in use. Power amp solid state designs are so proliferate and accessible that I always had something satisfying on the rack. But I may try my hand on one sometime too just for grins

Oracle1 22nd January 2020 10:06 AM

Well then i think that we all are waiting for your ss amp!!!


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