You can find PDF versions of the schematic and service manuals on several technical repositories: schematics|boardviews| ARCHIVE – Telegram
| Ref | Value / Part | Description / Notes | |-------|----------------------------------|----------------------| | | 6‑71 (beam‑power tube) | Matched pair, plate dissipation ≤ 30 W each | | R1 | 10 Ω, 5 W, 1 % metal‑film | Heater‑inrush limiter (for 6‑71 heater series, 6.3 V × 2 = 12.6 V) | | Rk | 1 kΩ, 2 W, carbon film | Cathode bias resistor (sets ~30 V bias) | | Rg | 470 kΩ, 0.5 W, metal‑film | Grid‑stop resistor (limits grid current) | | C‑in | 0.22 µF, 250 V polypropylene | Input coupling, blocks DC | | C1, C2 | 2 µF, 500 V electrolytic, low‑ESR| B+ filtering, placed as close to plates as possible | | L1 | 10 µH, air‑core choke (optional) | Additional B+ ripple filtering (if supply is noisy) | | TR1 | Output transformer, 4 Ω ↔ 8 Ω (or 4 Ω ↔ 8 Ω with 1:2 turns) | Provides impedance matching and DC isolation | | D1, D2 | 1N4007 (or similar) | Plate protection diodes (optional, across each plate‑cathode) | | F1 | 250 V, 2 A slow‑blow fuse | Primary protection on B+ rail | | J1 | 6‑71 socket (octal) | Two sockets, matched orientation | | U1 | Power supply (≈ 400 V DC) | Could be a transformer + rectifier + filter; see §4 | | R2 | 1 MΩ, 0.5 W, metal‑film | Grid‑leak resistor (provides DC return) | | C3 | 0.01 µF, 400 V ceramic (optional) | Plate‑to‑plate decoupling (reduces inter‑modulation) | 6-71-w24h0-d02a gp schematic
Below is a followed by a clean component list. You can copy‑paste the diagram into any plain‑text editor, or use it as a base for a CAD program (KiCad, Eagle, etc.). You can find PDF versions of the schematic