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-   -   Salas DCG3 preamp (line & headphone) (https://www.diyaudio.com/forums/analog-line-level/296406-salas-dcg3-preamp-line-headphone.html)

orelli 14th April 2020 07:29 AM

thank you very much, I supposed so.

Salas 14th April 2020 07:40 AM

But your power amp is going to see higher source impedance from the high pass filter if you will skip its buffer part?

orelli 14th April 2020 08:12 AM

I don't know.
Without buffer the amp see the impedance of two resistors and cap.
If I'll use the buffer, i'll put it between volt divider and cap.
I 'm not an expert one like you Nick.
In my Borbely preamp I checked with and without buffer and the differences was evident.
More control and dinamic with buffer,but before the splitter there is a k170/j74 buffer, not 3 mosfets in TO220 like in DCG3!

Salas 14th April 2020 08:25 AM

The DCG3 drives but through what it goes last counts. Maybe also try Rs 1k Rp 0.8k divider that DCG3 can still drive very well and listen.

orelli 14th April 2020 08:36 AM

I'll try this smaller values.
My amp is the Borbely Millenium 200 and input impedance is 1k1 ohm.

donhughes111 15th April 2020 01:33 PM

bearings?
 
I have a practical build question.

If you use an extension to bring something like a selector or attenuator that is back in the box to the front face plate, what kind of bearing do you use to bring it through the face plate so the knob can be put on it.

Thanks,
Don

Salas 15th April 2020 02:04 PM

Bits like so: DACT shaft extension sets for rotary switches

nashbap 15th April 2020 02:08 PM

Hi Don,


I use a simple metal sleeve cut from a piece of 1/4in ID threaded brass pipe. You could also buy something similar on Ebay; look for attenuator/potentiometer shaft extension. This is if you have a sheet metal front plate. If the front plate is thick metal or wood I think a simple hole will suffice. You can of course get carried away and choose to install a roller bearing; look for skate bearings they are small.
nash

savvas 17th April 2020 04:07 PM

One of the cheapest out there
Aluminum 300mm Volume Potentiometer Extension Shaft Audio Connecting Long Rod | eBay

Marra 17th April 2020 05:59 PM

I've used 8mm x 6mm shoulder bushes( available from Farnell) to good effect on 10mm front panels. Similar to To220 bushes.


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