Valve Final Amp (2)
printed circuit boards and construction
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Materials
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
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Component list
Resistors:
All fixed resistors: metal film, Beyschlag type MBE0414 or BC Components type PR-02, dim. 4x12 mm.
R1,R2,R11 = 1M?
R3 = 4k?7
R4,R17,R18 = 47k?
R5 = 390?
R6,R22,R28,R29 = 100?
R7 (LS = 8?) = 3k?3
R7 (LS = 4?) = 2k?2
R8 = 27k?
R9 = 100k?
R10,R26,R27,R30 = 1k?
R12,R14 = 150k?
R13 = 82k
R15 = 15k?
R16,R19 = 390k?
R20,R21 = 2k?2
R23 = 10k?
R24,R25 = 10?
P1 = 50k? preset
P2 = 10 k preset
P3 = 20 k preset
(All presets: Bourns type 3386P)
Capacitors:
All film capacitors: Wima type MKS4, unless indicated otherwise.
C1 = 470nF 100V, lead pitch 15mm
C2 = 100nF 400 V, lead pitch 15mm
C3 = 10µF 350V or 450V, axial, dim. 12x25 mm
C4 = 100pF 630V, polypropylene, dim. 5x11 mm
C5 (for LS 8?) = 680pF 630V, polypropylene, dim. 5.5x15 mm
C5 (for LS 4?) = 1000pF 630V, polypropylene, dim. 5.5x15 mm
C6,C12,C13 = 220nF 250V, lead pitch 15mm
C7,C14 = 470nF 630V, lead pitch 27.5 mm
C8 = 10µF 450V, axial, dim. 15x30 mm
C9,C10 = 100nF 630V, lead pitch 22.5 mm
C11 = 470µF 63V, radial, dim. 12.5x25 mm
Semiconductors:
D1 = 200 V 1.3 W zener diode
Valves:
V1 = EF86 (US: 6267)
V2 = ECC83 (US: 12AX7)
V3,V4 = EL34 (US: 6CA7), matched
Miscellaneous:
2 noval (9-way) valve sockets, ceramic
2 octal (8-way) valve sockets, ceramic
Tr1 = output transformer, Lundahl type LL1620 P-P
PCB, order code 020071-1
Power supply
Resistors:
R1,R2 = 47k? (Beyschlag type MBE0414 or BC Components type PR-02, dim. 4x12 mm)
Capacitors:
C1-C4 = 100nF 400V, lead pitch 15 mm
C5-C8 = 100 n/1000 V, lead pitch 22.5 mm
C9 = 470µF 63V, radial, lead pitch 5 mm, dim. 12.5x25 mm
C10,C11 = 470µF 400V, radial, lead pitch 10 mm (e.g., Roederstein series EYS)
C12 = 100nF 630V, lead pitch 22.5 mm
Semiconductors:
D1-D4,D9,D10 = 1N4007
D5-D8 = BYW96E
Miscellaneous:
Fuse, 315 mA (fast) with PCB mount holder
Mains transformer,
Discussion (0 comments)
Skalolaz 4 years ago
TheEditor 4 years ago