R-Pi with digital audio hat into tube amplifier.
This example creates a low-cost audiophile-grade audio player with tube amplification for headphones or powered speakers.
Tablet Frame Kit for Raspberry Pi and Arduino, Model SA8, by Novel Design Lab
Samsung A8 tablet (2018)
Raspberry Pi 3
Power supply for R-Pi: use charger from Samsung tablet. USB-C to micro B male adapter required, except if using Raspberry Pi 4.
HiFiBerry DAC+ with RCA output
Bravo Audio V2 Class A 12AU7 Tube Multi-Hybrid Headphone Amplifier
Mounting bracket for Bravo Audio amp, by Novel Design Lab (DIY 3D print file here)
Power supply for Bravo amp: 12V 5A 60W AC DC Power Supply Adapter
Miscellaneous items: microSD card, USB flash drive (for high-def audio files), RCA cables, headphones
Installed on Raspberry Pi:
Volumio (Raspberry Pi version) https://volumio.org/get-started/
Set up: the typical Volumio set-up is internet-connected via LAN for media streaming or access to shared storage. This project example uses Volumio in stand-alone configuration with the tablet connected to a WiFi access point created by the Volumio software installed on the R-Pi. When the R-Pi is powered-up, it'll present the WiFi network "Volumio". Set the tablet's WiFi connection to this network and use the network browser app (e.g. Chrome or other browser typically pre-installed on your tablet) to connect to IP address 192.168.211.1 (assigned to the R-Pi by Volumio). The Volumio login password is "volumio2". For more information, see the Volumio installation instructions https://volumio.github.io/docs/FAQs/Installation.html
Installed on tablet:
Network browser app pre-installed on tablet (e.g. Chrome, etc.)