Amazon.com: ICToParts 12AX7-EL84 6P14 PCB Board Push-Pull Power Amplifier Bile Machine DIY Kits G12-013 : Electronics
22mm*44mm 8k 20w Push-pull Output Transformer, No Super Linear Tap. Frequency Response: 25hz -26khz. Suitable For Tube El84 6p14 - Transformers - AliExpress
Adapting EL84 Audio Note circuit to Hammond 1650E | diyAudio
What Do the Terms "Push-Pull" and "Single-Ended" Mean?