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Wiring Schematic Diagram: tube EF86 +12AX7 (6N2P) + EL84 (6BQ5, 6P14P
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If You Can’t Find It, Build It DIY Tube Amp – Part 3
Mullard 3-3. Three Watt Amplifier
12dw7 cascode to approximate EF86 - The Amp Garage
Circuit Analysis of the Vox AC15 Pentode Preamp and Power Amp
88-50 Pre-Amplifier
The Beatles' preamp
Wiring Schematic Diagram: tube EF86 + EL34 8Watt Single-ended HI-FI