Vacuum tube preamplifier, digital filter aroma, DC 5.5*2.1 socket and 12V AC transformer for 6J1 vacuum electron tube valve preamp board headphone amplifier parts: Amazon.de: Electronics & Photo
LYNICESHOP Power Converter, 250W 300B Tube Amplifier Power Transformer, Primary Voltage 110V/Secondary Voltage 320V-0-320V, with Stabilizer Circuit Breaker Protection, US Standard, Universal
Amazon.com: KSA50 Pure Class A HiFi Amplifier Board Gold Seal Tube with Heat Plate for KRELL Audio : Musical Instruments
Like Power Transformer Coil HD 10 AMP 30.0.30V/2 AMP 12.0.12V/2 AMP 0.12V, Model Type 16, Size Hight 4 inch Weight 2 inch : Amazon.in: Electronics
Ring Transformer for Preamplifier Tone Board Tube Amplifier AC 110V to Dual AC 12V 28V Single 12V 200W(76)