Vintage guitar tube-amp circuits as they are documented: redrawn KiCad schematics, ngspice-checked netlists and operating points verified against the published voltage charts, plus the reference studies behind the corpus.https://circuitcodex.com/en-usCircuit data CC-BY-SA-4.0 — attribution requiredSun, 30 Aug 2026 00:00:00 GMThttps://circuitcodex.com/amps/aa764-vibro/https://circuitcodex.com/amps/aa764-vibro/Draft circuit: Blackface Vibro Champ-style (1964–1967), 5 W on 12AX7, 12AX7, 6V6GT, 5Y3GT, cathode-bias, 5Y3GT rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sun, 30 Aug 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/ab763-super/https://circuitcodex.com/amps/ab763-super/Draft circuit: Blackface Super Reverb-style (1964–1967), 40 W on 12AX7, 12AX7, 12AX7, 12AT7, 12AX7, 12AT7, 6L6GC, 6L6GC, GZ34, fixed-bias, long-tailed-pair phase inverter, GZ34 rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sun, 30 Aug 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/b15n/https://circuitcodex.com/amps/b15n/Draft circuit: Ampeg B-15N Portaflex-style (1961–1964), 25 W on 6SL7, 6SL7, 6SL7, 6L6GC, 6L6GC, 5AR4, fixed-bias, paraphase phase inverter, 5AR4 rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sun, 30 Aug 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/ga40/https://circuitcodex.com/amps/ga40/Draft circuit: Gibson GA-40 Les Paul-style (1956–1962), 15 W on 5879, 5879, 6SQ7, 12AX7, 6V6GT, 6V6GT, 5Y3GT, cathode-bias, paraphase phase inverter, 5Y3GT rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sun, 30 Aug 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/s1484/https://circuitcodex.com/amps/s1484/Draft circuit: Silvertone Twin Twelve-style (1963–1967), 60 W on 12AX7, 12AX7, 6CG7, 12AX7, 6CG7, 12AX7, 6L6GC, 6L6GC, fixed-bias, cathodyne phase inverter, 1N3194 ×4 (capacitor multiplier) + 1N3754 (bias) rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sun, 30 Aug 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/aa864-bassman/https://circuitcodex.com/amps/aa864-bassman/Verified circuit: Blackface Bassman-style (1964–1965), 50 W on 7025, 7025, 7025, 12AT7, 6L6GC, 6L6GC, fixed-bias, long-tailed-pair phase inverter, silicon, 3 diodes per phase rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Thu, 13 Aug 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/amps/5c1/https://circuitcodex.com/amps/5c1/Verified circuit: Wide-panel Champ-style (1953–1955), 4 W on 6SJ7, 6V6GT, 5Y3GT, cathode-bias, 5Y3GT rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Sat, 08 Aug 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/amps/5e4a/https://circuitcodex.com/amps/5e4a/Verified circuit: Tweed Super-style (1955–1956), 26 W on 12AY7, 12AY7, 12AX7, 6V6GT, 6V6GT, 5U4GA, fixed-bias, cathodyne phase inverter, 5U4GA rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Sat, 08 Aug 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/amps/5e5a/https://circuitcodex.com/amps/5e5a/Draft circuit: Tweed Pro-style (1956–1960), 30 W on 12AY7, 12AY7, 12AX7, 6L6GB, 6L6GB, 5U4GA, fixed-bias, cathodyne phase inverter, 5U4GA rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sat, 08 Aug 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/5e6a/https://circuitcodex.com/amps/5e6a/Draft circuit: Tweed Bassman-style (1956–1957), 40 W on 12AY7, 12AY7, 12AX7, 6L6G, 6L6G, 5U4GA, 5U4GA, fixed-bias, cathodyne phase inverter, 5U4GA rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sat, 08 Aug 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/6161/https://circuitcodex.com/amps/6161/Draft circuit: Valco 6161-style (1960–1968), 14 W on 12AX7, 12AX7, 12AX7, 6973, 6973, 5Y3GT, cathode-bias, paraphase phase inverter, 5Y3GT rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sat, 08 Aug 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/6g2/https://circuitcodex.com/amps/6g2/Verified circuit: Brown Princeton-style (1961–1963), 12 W on 7025, 12AX7, 6V6GT, 6V6GT, 5Y3GT, fixed-bias, cathodyne phase inverter, 5Y3GT rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Sat, 08 Aug 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/amps/6g4/https://circuitcodex.com/amps/6g4/Draft circuit: Brown Super-style (1960–1963), 40 W on 12AX7, 12AX7, 12AX7, 12AX7, 12AX7, 6L6GC, 6L6GC, GZ34, fixed-bias, long-tailed-pair phase inverter, GZ34 rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sat, 08 Aug 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/6g5/https://circuitcodex.com/amps/6g5/Draft circuit: Brown Pro-style (1960–1963), 40 W on 7025, 7025, 7025, 7025, 7025, 6L6GC, 6L6GC, fixed-bias, long-tailed-pair phase inverter, silicon bridge rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sat, 08 Aug 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/6g6b/https://circuitcodex.com/amps/6g6b/Draft circuit: Blonde Bassman-style (1963–1964), 50 W on 7025, 7025, 7025, 7025, 5881, 5881, fixed-bias, long-tailed-pair phase inverter, solid-state rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sat, 08 Aug 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/ab165/https://circuitcodex.com/amps/ab165/Verified circuit: Blackface Bassman-style (1965–1967), 50 W on 12AX7, 12AX7, 12AX7, 12AT7, 6L6GC, 6L6GC, fixed-bias, long-tailed-pair phase inverter, silicon full-wave rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Sat, 08 Aug 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/amps/ab763-twin/https://circuitcodex.com/amps/ab763-twin/Verified circuit: Blackface Twin Reverb-style (1963–1967), 85 W on 12AX7, 12AX7, 12AT7, 12AX7, 12AX7, 12AT7, 6L6GC, 6L6GC, 6L6GC, 6L6GC, fixed-bias, long-tailed-pair phase inverter, silicon full-wave rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Sat, 08 Aug 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/amps/ac30/https://circuitcodex.com/amps/ac30/Draft circuit: Vox AC30/6-style (1961–1965), 30 W on ECC83, ECC83, EL84, EL84, EL84, EL84, ECC83, ECC82, ECC83, GZ34, cathode-bias, long-tailed-pair phase inverter, GZ34 rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sat, 08 Aug 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/dr103/https://circuitcodex.com/amps/dr103/Draft circuit: Hiwatt Custom 100-style (1969–1981), 100 W on ECC83, ECC83, ECC83, ECC81, EL34, EL34, EL34, EL34, fixed-bias, long-tailed-pair phase inverter, silicon bridge rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sat, 08 Aug 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/jtm100/https://circuitcodex.com/amps/jtm100/Draft circuit: British 100-watt lead-style (1965–1966), 100 W on ECC83, ECC83, ECC83, KT66, KT66, KT66, KT66, fixed-bias, long-tailed-pair phase inverter, silicon diode bank rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sat, 08 Aug 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/m2204/https://circuitcodex.com/amps/m2204/Draft circuit: Master Volume lead 50-style (1977–1989), 50 W on ECC83, ECC83, ECC83, EL34, EL34, fixed-bias, long-tailed-pair phase inverter, silicon bridge rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sat, 08 Aug 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/reference/studies/tone-stack-ladder/https://circuitcodex.com/reference/studies/tone-stack-ladder/A wiring study behind the Circuit Codex tone-stack presets.Sat, 08 Aug 2026 00:00:00 GMTStudyhttps://circuitcodex.com/amps/5f4/https://circuitcodex.com/amps/5f4/Verified circuit: Tweed Super-style (1957–1960), 26 W on 12AY7, 12AX7, 12AX7, 6L6G, 6L6G, 5U4G, fixed-bias, cathodyne phase inverter, 5U4G rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Mon, 03 Aug 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/amps/5d3/https://circuitcodex.com/amps/5d3/Draft circuit: Wide-panel Tweed Deluxe-style (1954–1955), 12 W on 12AY7, 12AX7, 6V6GT, 6V6GT, 5Y3GT, cathode-bias, paraphase phase inverter, 5Y3GT rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sun, 02 Aug 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/5f6/https://circuitcodex.com/amps/5f6/Verified circuit: Tweed Bassman-style (1957–1958), 40 W on 12AY7, 12AX7, 12AX7, 5881, 5881, 83, fixed-bias, long-tailed-pair phase inverter, 83 rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Sun, 02 Aug 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/amps/6g3/https://circuitcodex.com/amps/6g3/Verified circuit: Brown Deluxe-style (1961–1963), 15 W on 12AX7, 12AX7, 12AX7, 6V6GT, 6V6GT, GZ34, fixed-bias, long-tailed-pair phase inverter, GZ34 rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Sun, 02 Aug 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/amps/aa1164/https://circuitcodex.com/amps/aa1164/Verified circuit: Blackface Princeton Reverb-style (1964–1967), 12 W on 12AX7, 12AT7, 12AX7, 12AX7, 6V6GT, 6V6GT, 5U4GB, fixed-bias, cathodyne phase inverter, 5U4GB rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Sun, 02 Aug 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/amps/aa764/https://circuitcodex.com/amps/aa764/Verified circuit: Blackface Champ-style (1964–1968), 5 W on 12AX7, 6V6GT, 5Y3GT, cathode-bias, 5Y3GT rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Sun, 02 Aug 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/amps/aa964/https://circuitcodex.com/amps/aa964/Verified circuit: Blackface Princeton-style (1964–1968), 12 W on 12AX7, 12AX7, 6V6GT, 6V6GT, GZ34, fixed-bias, cathodyne phase inverter, GZ34 rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Sun, 02 Aug 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/amps/ac15/https://circuitcodex.com/amps/ac15/Draft circuit: Vox AC15-style (1960–1963), 15 W on EF86, ECC83, ECC83, ECC83, ECC82, EL84, EL84, EZ81, cathode-bias, long-tailed-pair phase inverter, EZ81 rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sun, 02 Aug 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/m1959/https://circuitcodex.com/amps/m1959/Draft circuit: Super Lead 100-style (1965–1981), 100 W on ECC83, ECC83, ECC83, EL34, EL34, EL34, EL34, fixed-bias, long-tailed-pair phase inverter, silicon bridge rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sun, 02 Aug 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/ab763/https://circuitcodex.com/amps/ab763/Verified circuit: Blackface Deluxe Reverb-style (1964–1967), 22 W on 12AX7, 12AX7, 12AX7, 12AT7, 12AX7, 12AT7, 6V6GT, 6V6GT, GZ34, fixed-bias, long-tailed-pair phase inverter, GZ34 rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Sun, 19 Jul 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/amps/m1987/https://circuitcodex.com/amps/m1987/Draft circuit: Plexi lead 50-style (1967–1981), 50 W on ECC83, ECC83, ECC83, EL34, EL34, fixed-bias, long-tailed-pair phase inverter, silicon full-wave rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sun, 19 Jul 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/5e1/https://circuitcodex.com/amps/5e1/Verified circuit: Tweed Champ-style (1955–1957), 5 W on 12AX7, 6V6GT, 5Y3GT, cathode-bias, 5Y3GT rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Sat, 18 Jul 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/amps/5e3/https://circuitcodex.com/amps/5e3/Verified circuit: Tweed Deluxe-style (1955–1960), 15 W on 12AY7, 12AX7, 6V6GT, 6V6GT, 5Y3GT, cathode-bias, cathodyne phase inverter, 5Y3GT rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Sat, 18 Jul 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/amps/5f1/https://circuitcodex.com/amps/5f1/Verified circuit: Tweed Champ-style (1958–1964), 5 W on 12AX7, 6V6GT, 5Y3GT, cathode-bias, 5Y3GT rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Sat, 18 Jul 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/amps/5f10/https://circuitcodex.com/amps/5f10/Verified circuit: Tweed Harvard-style (1958–1961), 10 W on 6AT6, 12AX7, 6V6GT, 6V6GT, 5Y3GT, fixed-bias, cathodyne phase inverter, 5Y3GT rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Sat, 18 Jul 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/amps/5f2a/https://circuitcodex.com/amps/5f2a/Draft circuit: Tweed Princeton-style (1957–1961), 5 W on 12AX7, 6V6GT, 5Y3GT, cathode-bias, 5Y3GT rectifier. Redrawn KiCad schematic, ngspice netlist, simulated draft operating points, and structured metadata.Sat, 18 Jul 2026 00:00:00 GMTCircuitDrafthttps://circuitcodex.com/amps/5f6a/https://circuitcodex.com/amps/5f6a/Verified circuit: Tweed Bassman-style (1958–1960), 40 W on 12AY7, 12AX7, 12AX7, 5881, 5881, GZ34, fixed-bias, long-tailed-pair phase inverter, GZ34 rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Sat, 18 Jul 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/amps/jtm45/https://circuitcodex.com/amps/jtm45/Verified circuit: British lead-style (1962–1966), 45 W on ECC83, ECC83, ECC83, KT66, KT66, GZ34, fixed-bias, long-tailed-pair phase inverter, GZ34 rectifier. Redrawn KiCad schematic, ngspice-verified netlist, published-chart operating points, and structured metadata.Sat, 18 Jul 2026 00:00:00 GMTCircuitVerifiedhttps://circuitcodex.com/reference/studies/12ax7-calibration/https://circuitcodex.com/reference/studies/12ax7-calibration/A metrology study behind the Circuit Codex tube models.Sat, 18 Jul 2026 00:00:00 GMTStudy