Greetings everyone. I wanted to share a few pics here of the Ear+HD I'm building. I built my first one about two years ago, and love it very much. I did wish to add some extra switched inputs, and also wished I had room for an attenuator, which the stock chassis will not accomodate. After a lot of fidgeting, I finally committed to build another one in a custom chassis.
So why not go nuts if you are going to go for a custom chassis anyway, right? I contacted Dr. Peppard about buying a kit without the chassis, as I do want to support him in his work, and also discussed possibly using a tube rectifier. Well, it turns out that one of the early Ear amps had a tube rectifier. So we settled on a hybrid hexfred/tube bridge rectifier arrangement. I also added a C-L-C filter in front of the existing C-R-C-R-C filter in the B+ PSU, utilizing a nice NOS thordarson choke I have. So it's now a C-L-C-R-C-R-C arrangement.
Here is the new PSU breadboarded (plywooded?) and tapped into the existing Ear+HD- also using it's filament supply for testing:
Potted the two power transformers in thermal epoxy:
Top plate is punched from stainless steel:
Finished version of top plate is polished stainless:
And finally the backside, showing the underside oil cap bracket and ceramic terminal strips:
The base is still in pieces on my tablesaw, but is coming along nicely. It will be machined from some Red Birch, with an oiled and polished finish.I want to thank Lloyd
publicly for his invaluable assitance to me in planning and implementing this amp. The Ear+HD is a wonderful amp IMO, and was easily worthy of building all over again, albeit in a more customized implementation. I listen mainly with Senn 650s with the Equinox cable and/or AKG K701s, with some time being devoted to Grado.
Further pics and dialog are also posted in the DIY section of Head-Fi if you are interested. I am not going to link there though, and am posting here because Dr. Peppard has a dedicated forum segment here. Go Mapletree!(sorry for such a fanboy-ish first post, but what can I say?)