Consonance Opera Cyber 211 mods

I have two headphone amps from Opera Consonance. It seems that in their design, they utilize the chassis as a conduit to channel ground from various parts to the ground connection on the powercord. One of the amps had developed some issue andvI had Nick Gowan in Campbell fixed it for me at a very reasonable price. He indicated the ground design and basically re-routed all the grounding directly to the ground connection.

I would recommend talking to him. Also, there are a lot of DIYers on Audio Circle and Head-Fi forums with strong technical background. You might want to check over those sites for assistance.

Would love to hear how your amps sound. I'm in Sunnnyvale.

FrankC

would these upgrades work on the cyber 800's?

I don't know if 211 design is similar enough to the 800s - check with the distributor regarding similarities in design. It's likely that the 211 is similar to the 845 version because you can buy it to be compatible with both tubes, for an upcharge of course. Mine are straight 211 design.

At the moment I have completed the left monoblock with vcaps, connectors, and hookup wiring, and the right monoblock with all that plus the resistors - so I could hear the difference - which as I said is substantial. If you are interested in that let me know. I will post when I have completed both amps the same, including the pending bridge rectifier rebuild.

I don't know what the big deal with Agon is regarding urls to other sites with information directly related to Agon users. But here is another attempt to show the link to photo's so far.

flickr dot com slash photos slash 80136324@N02 slash

Thanks for the great response to my post on the 845S monoblocks. As for NED KELLY, where have you been? He is only our most famous bushranger hero downunder in Australia (I am in Melbourne), GOOGLE him. I don't think I will get further into these amps as the sound I am achieving now is outstanding to my ears. Unfortunately I don't know anyone who has what I consider a better system and until I do hear something better I will just call a halt. I did make up some mains leads from 15A semiflexible 3 core wire. I fitted an Australian 15A 3 pin plug to one end and a silverplated IEC 15A to the other. I wasn't expecting much as I was already using some fairly heavy shielded ex. computer cables but the sound did improve a little with slightly better dynamics. Darned if I know why!

Regarding my 845S mono blocks, I have now replaced the original Shuguang 845B tubes with Psvane (Pavane) "Hi Fi Series" 845 tubes. These sound far better (to my ears) than the original 845B tubes ever did. Apparently their "Collection Series" tubes sound even better but at considerably higher cost. I believe Psvane make 211 tubes and it would be interesting to hear how they sound in a 211 amp. Has anyone tried their 845 tubes?