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5687 based simple preamp Basic layout DIY Paradise 9 January 2003

5687 based simple preamp Basic layout DIY Paradise 9 January 2003. 6X4 5687. Schematic Signal circuitry courtesy of vt4c@hotmail.com. Output RCA jack. IEC socket. Input RCA jack. Power transformer. 6X4. 50+50uF/ 500V electrolytic capacitor. Stereo volume pot. 5687.

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5687 based simple preamp Basic layout DIY Paradise 9 January 2003

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  1. 5687 based simple preamp Basic layout DIY Paradise 9 January 2003

  2. 6X4 5687 Schematic Signal circuitry courtesy of vt4c@hotmail.com

  3. Output RCA jack IEC socket Input RCA jack Power transformer 6X4 50+50uF/ 500V electrolytic capacitor Stereo volume pot 5687 Chassis Layout Top View

  4. Few points to note here. Power circuitry is kept at center. Signal comes in from the input RCA jack, goes to volume pot, then tube, then routes to output RCA jack. Coloured wavy line shows signal path. The purpose of doing the layout is to avoid stray flux (from transformer, chokes) from coupling into your signal and also to ensure components are not too cramped together to the extent that there isn't enough ventilation. Input RCA jack IEC socket Output RCA jack 30H chokes 50+50uF/ 500V electrolytic capacitor 6X4 Stereo volume pot 5687 Chassis Layout Bottom View

  5. The following wiring diagrams are meant to aid you in the sequence in wiring this preamp. Of course, you can do it some other way. Any other way, actually. • Please note that layout of components is not to scale, so when you plan your chassis, don’t simply “follow” what you see here. • Remember basic rules still apply: • keep signal wires far away from filament wires transformer, chokes and tube rectifier. • cross only at 90 degrees. • twist tightly the heater wires, place close to chassis. • maintain star ground. • SAFETY FIRST: REMEMBER TO SOLDER IN BLEEDER RESISTOR! REMEMBER TO “EARTH THE CHASSIS”! • You “earth the chassis” by wiring Earth of IEC socket to chassis, through a nut. THEN confirm the resistance between Earth of IEC and chassis is as close to zero as possible.

  6. Input RCA jack short to chassis Output RCA jack insulated from chassis 2 1 3 4 7 5 6 2 1 3 4 9 7 8 5 6 6X4 50+50uF 500V Using tube socket spigot as ground Using tube socket spigot as ground 5687 Gnd Out In Unused Alps stereo pot Ground layout

  7. 2 1 3 4 7 5 6 2 1 3 4 7 8 9 5 6 3.15-0-3.15V Gnd Out In Unused Alps stereo pot Wiring of heaters 3.15-0-3.15V

  8. 2 1 3 4 7 5 6 30H choke 30H choke 2 1 3 4 7 8 9 5 6 350-0-350V Bleeder resistor. Very important!!!!! 270kohm 2W Tap B+ from here Gnd Out In Unused Alps stereo pot Wiring of power supply

  9. 2 1 3 4 7 5 6 30H choke 30H choke 2 1 3 4 7 8 9 5 6 L / R Input L / R Output 350-0-350V 1 Mohm 0.47uF Gnd Out In Unused Alps stereo pot Wiring of In/Out circuitry

  10. 2 1 3 4 7 5 6 30H choke 30H choke 2 1 3 4 7 8 9 5 6 L / R Input 3.15-0-3.15V L / R Output 350-0-350V 10kohm 10kohm 470ohm paralleld with 470uF 470ohm paralleld with 470uF Gnd Out In Unused Alps stereo pot Wiring of signal circuitry 3.15-0-3.15V

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