Down to only 12 amps !!!
What is the red one?
Its a AGDR designed O2 ODA amp.
Only about 5 or 6 ever built…its a powerful amp, very clean and I would stack it up against most any SS amp up to $1K or even higher…
AGDR is a wizard that unfortunately has dropped of the radar screen…this amp can be found in a long detailed thread at : Diyaudio ODA Headphone Amplifier
I never had the front cover engraved, should do that some day!!
The no-whistles black box on the bottom left looks interesting.
Thats a DIY amp that a fellow at diyaudio presented a discrete Class A design called the Terminator or T2 at first and was changed to “Noir”. The PCB and case is sold at the diyaudio store:
It puts out 2 watts of Class A Power. Its a very easy first time headphone amplifier and has a build thread here:
And a Build Guide:
Its a really great little amp that sounds nice…lots of power.
That looks like an interesting build, I may actually give it a try.
Is the preamp out fixed or controlled by the volume? Any way of making it a permanent out (always active)?
Plug straight into the PC motherboard.
Go back to where we all started off with PC based audio.
Buy yourself a Headamp GSX-mini. You’ll like it.