New Headphone amp needed

[Brakspear75]

Hi all,

First, a confession - I've killed my O2 headamp after many years of excellent service. Very stupidly I plugged the wrong power jack in and rather than receiving 15V ac it got 21V dc off an SMPS. The power led still lights but no sound out, I haven't opened it up yet to see what's fried...

So, two questions that I'd appreciate some adivce on:

1) What am I likely to have killed in the O2 and given it's age, is it worth reviving?

2) If the O2 is not state of the art these days, recommendations for a new headamp. My headphones are HiFiMan Sundara, 32 ohm IEMs so fairly current hungry. I don't need the amp to be portable and don't need an integrated DAC. I prefer revealing, uncoloured very low distortion amps, is there anything out there taking advantage of the newer OPA 16xx series? Valve amps need not apply, just my preference.

Thanks in advance for all contributions

 

[fubar3]

The O2 has 20vac max so the regulator input can handle upto 28vdc. However, an opamp might fail for having +dc without -dc. Replace the opamps.. If that does not work, try bypass of the power management circuit.

Fix the O2 so you compare it to other headphone amps you get.

 

[abraxalito]

For a very low distortion amp, worth taking a look here : https://www.diyaudio.com/community/threads/the-crocodile.270294/ and here : https://www.diyaudio.com/community/...t-headphone-amp-with-140db-distortion.387033/

 

[Brakspear75]

Thanks for the replies - I have signed up to the new GB for the Omicron.

At some point I will troubleshoot & resuscitate the O2 - just at the moment life has thrown me a deeply unwelcome curve-ball so further updates may be delayed.