Amazon.com: Lowell TLM-600 Impedance Matching Transformer, 70/25V In to 600/8 Ohm Out : Electronics
Amazon.com: Matching Transformer, Ancable 2-Pack Nickel Plated - 75 Ohm to 300 Ohm Adapter - UHF/VHF/FM Balun Transformer - Antenne Transformer Converter Adapters with F Female Jack for TV, Radio, Coax Antenna : Electronics
Amazon.com: Bewinner 10pcs Audio Transformers, Double-Wire Winding Single Power Provide Phase Voltage Transformer, Moisture-Proof Oil immersed air Cooled Load impedance Transformer - EI14 600 : 600 Ohm : Electronics
Transformers Audio & Signal 2-500MHz IL 1dB Impedance Ratio 1:8 (100 pieces): Amazon.com: Tools & Home Improvement
Amazon.com: Shure A85F Line Matching Transformer - Low Z Female XLR to High Z 1/4-Inch Phone Plug connects a Balanced Low Impedance Microphone Output to an Unbalanced High Impedance Input : Everything