"Millett Hybrid" redux: NuHybrid headphone amp, using the Korg Nutube
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ken_chuang

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Here's my NuHybrid headphone amp build.

Main upgrades
1) Sigma11 Power Supply Unit
2) OPA1611AID opamp with extended 200MA current (green circuit board).

Works well with my Sennheiser HD800 S headphone.

Nutube amp 2.jpgNutubew PSU 1.jpg
 
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HiFan

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Here's my NuHybrid headphone amp build.

Main upgrades
1) Sigma11 Power Supply Unit
2) OPA1611AID opamp with extended 200MA current (green circuit board).

Works well with my Sennheiser HD800 S headphone.

Nutube amp 2.jpgNutubew PSU 1.jpg
Nice build! Have you tried opa209? I found it cleaner than 1611 in this circuit.
 
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ken_chuang

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Nice build! Have you tried opa209? I found it cleaner than 1611 in this circuit.
Thanks for your reply. I had not tried OPA209 yet, great to know it works better too. I had been mainly looking out for high voltage (24V), high current (200MA) opamp options so far.
 
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Thanks for your reply. I had not tried OPA209 yet, great to know it works better too. I had been mainly looking out for high voltage (24V), high current (200MA) opamp options so far.
That circuit is picky on the opamps. I have tried a few but only opa209 and LT1357 families works. Some will have higher white noise in the background than others.

However, your opa1611s are interesting. I don’t know such mod exists.
 
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ken_chuang

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However, your opa1611s are interesting. I don’t know such mod exists.
Search for "OPA1611AID with Extended 200MA Current Class A Output Single OP AMP Module", many e-commerce sites sell them.

This is my 1st time trying this kind of modded opamp too.
 
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Search for "OPA1611AID with Extended 200MA Current Class A Output Single OP AMP Module", many e-commerce sites sell them.

This is my 1st time trying this kind of modded opamp too.
I looked at your photos a bit more. Did you ground your board and case? I normally would sand around power, screw, and pot holes so they they can be connected electronically. Pot shaft definitely need it.
 
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I looked at your photos a bit more. Did you ground your board and case? I normally would sand around power, screw, and pot holes so they they can be connected electronically. Pot shaft definitely need it.
I didn't do ground for this. Looks like I should. I am getting noise from just slight re-positioning my interconnect between my phono preamp and this. Thanks for your feeback on this.
 
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