Amazon.com: weideer Input AC 110V 50/60HZ Output AC 12V 10VA Power Transformer AC/AC Single Phase Transformer for Lighting Power Supplies, Audio Equipment etc. Various Small Power Supplies K-001 : Electronics
Amazon.com: MeLphi 100W Audio EI Type Transformer Output 0V-230V-290V/0.2A+6.3V/4A Power Transformer for EL34 Class A Tube Amplifier (Size : 115V) : Industrial & Scientific
Amazon.com: Control Transformer 50W Power Audio Transformer, Input 380V220V to AC 6V9V12V15V18V24V30V36V110V, Single Double AC Transformer (Color : 220V Double, Size : 6V) : Industrial & Scientific
High-end Dual C-core Audio Amplifier Power Transformer Dual 300V+14V+6.5V Suitable for ARC Vacuum Tube preamplifier - Amazon.com
Amazon.com: BOJACK EE-14 8 Ohm Audio Transformer 1300 : 8 Ohm for Voltage Amplification and Power Output(Pack of 10 Pcs) : Industrial & Scientific
1 Pair/600:10K Permalloy Audio Signal Step-Up Isolation Transformer 4X Amplified Audio Microphone (Color : As Picture) - Amazon.com