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DAC-END R (ES9018) full assembled board

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danny_66

danny_66

Member
Joined 2005
So will be necessary some listen tests to check the best configuration.
Click to expand...

Thanks Andrea, it's clear now.

I'm only interested in the DAC SE outputs, so now I wonder which one is best:
1) ES9018 balanced -> 10-20ohm I/V resistor -> unbalancer transformer/tubes -> tube output
2) ES9018 SE -> 10 I/V resistor -> tube output

ES9018 in SE looks like the most simple, but is there any advantage in using the ES9018 in balanced output when going to a SE output stage ?

Regards,
Danny
 
A

audiodesign

Member
Joined 2005
output stage consideration - part2

Here some output stages to test:

1) Original ES9018 schematic for evaluation - active IV with feedback (balanced)
Common op-amp configuration
2) Actual op-amp module
used also in Mark Levinson no. 380 and published on OPA627 datasheet as High Speed Instrumentation Amplifier (balanced to use in voltage or current mode with passive IV)
3) Lundahl LL1684 (balanced in voltage mode)
4) Satri design (not suggested)
5) AD844 design (not suggested)
6) My design based on Phase Tech HD-7A (balanced current mode)
7) Raleigh Audio Line Stage clone with K & K Audio Basic CCS modules (balanced current mode with passive IV)
8) DAC End 2 I/V - SE with 5687 or E182CC by Quanhao (un-balanced current mode with passive IV)

I should test many of these in the next days.
 

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