DC coupled preamps

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AmpDesigner333

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DC coupled preamps
« on: 16 Jan 2020, 11:40 pm »
Any out there?  Aside from passive ones, by the way.   Thanks.

Rusty Jefferson

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Re: DC coupled preamps
« Reply #1 on: 17 Jan 2020, 12:18 am »
So, not from this circle's company?   David Berning's preamps are DC Coupled, and have DC output protection.  Accordingly, the Linear Tube Audio preamp and their MZ3 are also DC coupled with protection. 

AmpDesigner333

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Re: DC coupled preamps
« Reply #2 on: 17 Jan 2020, 12:25 am »
So, not from this circle's company?   David Berning's preamps are DC Coupled, and have DC output protection.  Accordingly, the Linear Tube Audio preamp and their MZ3 are also DC coupled with protection.
Cherry DACs are DC coupled with double differential true balanced outputs.  We typically recommend driving our amplifiers directly with our DACs for end-to-end DC coupling.

Samac

Re: DC coupled preamps
« Reply #3 on: 17 Jan 2020, 01:03 am »
Any out there?  Aside from passive ones, by the way.   Thanks.

The Schiit Freya S is. Have one, love it.

https://www.schiit.com/products/freya-s

Cheers,

Scott

AmpDesigner333

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Re: DC coupled preamps
« Reply #4 on: 17 Jan 2020, 03:20 pm »
The Schiit Freya S is. Have one, love it.

https://www.schiit.com/products/freya-s

Cheers,

Scott
Frequency Response: 20Hz-20Khz, -0.1db, 3Hz-500KHz, -3dB -- NOT DC coupled !!

Samac

Re: DC coupled preamps
« Reply #5 on: 17 Jan 2020, 04:24 pm »
Frequency Response: 20Hz-20Khz, -0.1db, 3Hz-500KHz, -3dB -- NOT DC coupled !!

Ok.

Cheers,

Scott

richidoo

Re: DC coupled preamps
« Reply #6 on: 17 Jan 2020, 04:36 pm »
Frequency Response: 20Hz-20Khz, -0.1db, 3Hz-500KHz, -3dB -- NOT DC coupled !!

3Hz signal normally not a concern for me. ;)   
Freya user manual: "Freya S is also complely DC-coupled (no capacitors in the signal path)"
I need a BAL<>SE preamp and I didn't know this existed. Thanks Samac!

Hey Tommy will your new preamp have BAL<>SE conversion?

Samac

Re: DC coupled preamps
« Reply #7 on: 17 Jan 2020, 05:05 pm »
3Hz signal normally not a concern for me. ;)   
Freya user manual: "Freya S is also complely DC-coupled (no capacitors in the signal path)"
I need a BAL<>SE preamp and I didn't know this existed. Thanks Samac!

Hey Tommy will your new preamp have BAL<>SE conversion?

You’re welcome, richidoo. :thumb:

Cheers,

Scott

AmpDesigner333

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Re: DC coupled preamps
« Reply #8 on: 17 Jan 2020, 05:21 pm »
3Hz signal normally not a concern for me. ;)   
Freya user manual: "Freya S is also complely DC-coupled (no capacitors in the signal path)"
I need a BAL<>SE preamp and I didn't know this existed. Thanks Samac!

Hey Tommy will your new preamp have BAL<>SE conversion?
Something's fishy here.  There should be no attenuation at low frequencies at all if this preamp is really DC coupled end-to-end.  Maybe they just copy/pasted the specs from another preamp and forgot to edit it (on the website).

The concern is not about the amplitude roll off, but rather the phase delay.  Explained here:
https://www.audiocircle.com/index.php?topic=167261.0

Here's the manual, in case anyone's interested:
https://www.schiit.com/public/upload/PDF/freya%20S%20manual.pdf

No specs in the manual.

AmpDesigner333

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Re: DC coupled preamps
« Reply #9 on: 17 Jan 2020, 05:24 pm »
So, not from this circle's company?   David Berning's preamps are DC Coupled, and have DC output protection.  Accordingly, the Linear Tube Audio preamp and their MZ3 are also DC coupled with protection.
Thanks!!

AmpDesigner333

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Re: DC coupled preamps
« Reply #10 on: 17 Jan 2020, 05:27 pm »

Hey Tommy will your new preamp have BAL<>SE conversion?
We've made some radical changes to the design and plan to announce the new product at AXPONA in April.  It will have multiple inputs (digital and analog) and dual outputs.  Thanks.