- on Audio/Video/Photography
- Published in issue 10/2003 on page 0
Valve headphone Amplifier
EL84 (6BQ5) at an anode voltage of 40 V
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.
Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.
R1,R3,R5,R7 = 1k?
R2,R6 = 100?
R4,R8 = 220k?
P1 = 100k? stereo logarithmic
C1,C2 = 100nF
C3,C5 = 100µF 10V radial
C4,C6 = 10µF 63V radial
C7 = 100µF 63V radial
B1,B2 = EL84 or 6BQ5 with noval socket (18mm diam.)
L1,L2 = 330mH choke (Toko 10RBH 239LY334K)
JP1-JP4 = 2-way pinheader with jumper
K1 = 3-way PCB terminal block, 5mm lead pitch
K= 2- way PCB terminal block, 5mm lead pitch
TR1,TR2 = mains transformer 18V/4.8VA (Gerth # 421.18)
PCBs, order code 030064-1 and 030064-2