Presenting β22 - Double Decker (sports bar edition). Before getting into any further details, first of all hats off to Ti for such an excellent design!!! I've not come across such a great headphone amp till date. I won't be able to do justice by describing all features/qualities, would recommend that if you get chance, do listen to this superb amp.
Build details:
- 3-channel active-ground β22 (quiescent current set to 140mA)
- ε22 backplane board (bought during last group buy)
- σ22 regulated power supply (±30VDC output)
- Toroidy SUPREME AUDIO grade transformer TSAS100VA https://sklep.toroidy.pl/en_US/p/TTSAS0100-SUPREME-AUDIO-grade-transformer-TSAS100VA-voltage-to-50V/391
- ALPS Slide Potentiometers Dual Unit (10KΩ) https://www.mouser.com/ProductDetail/688-RSA0K12A1013
- Schurter DD12 IEC with Filter https://www.mouser.com/ProductDetail/693-3-109-957
- Neutrik jack and RCA connectors
- Aavid-Thermalloy heatsink (530002B02500 onboard, 2.5" tall, pin-mount)
- HUTTEN - custom enclosure (another IKEA hack) https://www.ikea.com/us/en/catalog/products/70032451/
- Custom Panel (front, back, side and top) - Acrylic - Tap Plastics https://www.tapplastics.com/
Issues:
- Fluctuating quiescent current. Issue similar to following:
https://www.amb.org/forum/preliminary-initial-setup-t1552.html
https://www.amb.org/forum/quiescent-current-fluctuating-t1403.html
Final build:
Note: It's advised not to place bottles directly on the top shelf as it blocks the vent, instead use stackable racks (see build log).
More pictures/build log to follow.
Thanks!