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  (paper "User" 676.66 374.22)
  (title_block
    (title "B15N — Ampeg B-15N Portaflex-style")
    (date "2026-08-30")
    (rev "draft")
    (company "Circuit Codex")
    (comment 1 "Redrawn from circuit facts — not a reproduction of any factory drawing")
    (comment 2 "CC-BY-SA 4.0 · circuitcodex.com")
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  (text "Rails: BP1 = the 5AR4 cathode and C17 reservoir, which is also the OT-214 primary centre tap and therefore the 6L6GC plate node (450 V on the drawing) — BP2 = the screen node, one 1 kOhm 10 W dropper below it (445 V) — BP3 = the preamp rail both channels share and BP4 = the driver rail, each behind its own 22 kOhm 1 W dropper off BP2. The two never rejoin." (at 12.7 310.978 0)
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  (text "The 6.3 V heater chain (green pair, VR7 100 Ohm hum balance, sockets V1..V5 on pins 7/8 and 7/2), the mains side beyond the transformer primary (POWER SW6, POLAR. SW7, the 3 A and 6 A fuses, the switched AC outlet, C18 and CM2) and the panel pilot lamp are omitted here — see the parts list and the board layout. The drawing puts that pilot straight across the mains primary, not on the heater chain." (at 12.7 315.378 0)
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  (text "Two printed voltages on the driver cannot be true and are carried as disputed rather than fitted: 3 V across R25 220 Ohm is 13.6 mA, six times a 6SL7 unit's Class-A point and 3.2 W in a 1 W plate, and 2.2 V across R24 1 kOhm needs a 489 V rail behind the drawn 120 kOhm in an amplifier whose highest node is 450 V. See the circuit story." (at 12.7 319.778 0)
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  (text "The OT-214 secondary is tapped — GRN., YEL. and BLK. on the drawing — and the EXT. SPKR. jack J6 normals the internal 8 Ohm speaker. Only the green and black ends are drawn here, with R41 250 Ohm 10 W across them; the yellow tap, J6 and the speaker are the annotation layer." (at 12.7 324.178 0)
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  (text "Every crossing drawn here is a crossing: the factory sheet marks \"crosses, does not connect\" with a small S-jog, and this redraw uses the plain KiCad convention instead — a junction dot means a joint and nothing else does." (at 12.7 328.578 0)
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  (text "Both channels sum through 270 kOhm apiece onto the driver grid, which has no grid leak of its own: its DC returns are R40 10 kOhm, the global feedback resistor, to the output transformer's green lead, and the path back out through those two mixing resistors and both tone boards to their 22 kOhm feet. The EXT. AMP. jack J5 taps the same node." (at 12.7 332.978 0)
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  (text "The mains side is the annotation layer, drawn only as far as the sheet settles it: the POWER switch SW6 in one line leg ahead of the transformer primary, and the two 0.047 uF 600 V capacitors it letters C18 and (a third time) C19 — listed CM2 — from the line to chassis, the first through the POLAR. switch SW7. That corner of the published scan is coarse: the parts, their values and their mains-side placement are the sheet's; the exact switching is drawn as the line-to-chassis pair it letters. The 3 A and 6 A fuses, the switched 120 V AC outlet and the panel pilot lamp are not drawn — this circuit puts that pilot straight across the transformer primary, not on the heater chain." (at 12.7 337.378 0)
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