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WORLD DESIGNS WDHD3S, Assembly Instruction Manual

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WORLD DESIGNS WDHD3S Assembly Instruction Manual Download Page 9

Fig. 8

Diode Polarity

Fig. 7

PCB Pin and Heater Link Positions

8

WDHD3S Kit Assembly Instructions

FIT THE DIODES.

Fit the diodes D1, D2, D3 & D4. Orientation is very important

-

note that the stripe on the diode matches with the stripe on the
PCB legend for correct polarity.

FIT THE RESISTORS.

Elevate the higher power resistors R1, R2, R4, R6, R11, R13,
R17, R18, R19 from the PCB by at least 10mm as they require a
cooling flow of air around them.

Figs.
8 / 10

Fig. 10

Fig. 8

Diode Polarity

Fig. 7

PCB Pin and Heater Link Positions

8

WDHD3S Kit Assembly Instructions

FIT THE DIODES.

Fit the diodes D1, D2, D3 & D4. Orientation is very important

-

note that the stripe on the diode matches with the stripe on the
PCB legend for correct polarity.

FIT THE RESISTORS.

Elevate the higher power resistors R1, R2, R4, R6, R11, R13,
R17, R18, R19 from the PCB by at least 10mm as they require a
cooling flow of air around them.

Figs.
8 / 10

Fig. 10

Summary of Contents for WDHD3S

Page 1: ...WDHD3S Valve Headphone Amplifier Kit Assembly Instructions www world designs co uk 07972 055492 HD3S Build 09 2013 ...

Page 2: ...are soldering The larger power supply capacitors will hold a residual charge after switch off so wear your gloves at all times when working internally Additionally be aware that valves do get very hot and will burn skin on contact therefore please position in a safe place away from children and animals Due to the heat dissipation from the circuit the case top surface does get hot and the front pan...

Page 3: ...difficult thing is to remember to slide an appropriate length of heat shrink over the wires BEFORE soldering the joint Slide the sleeving completely over the bare wires and carefully apply heat from a mini heat gun available cheaply over the internet or from a cigarette lighter taking care not to damage any PVC insulation nearby We supply plenty of heat shrink so do practice a couple of times befo...

Page 4: ...ed Fit the headphone socket to the front panel using the washer and nut provided Offer up the front panel to the chassis to make sure that the socket sits centrally in the hole in the fascia and adjust if necessary Note that the PCB star earth will be connected to the chassis via the headphone socket it is important to scrape some paint away from the inside of the chassis where it meets the socket...

Page 5: ...ssembly Instructions 4 Fit the output transformers to the chassis using M4x10 screws serrated washers and nuts positioning the secondary leads blue x 4 and purple x 4 towards the outside of the chassis Fit the stand offs for the PCB using M3x12 screws from the underside of the chassis ...

Page 6: ...E 4 BLADE 5 BLADE 6 BLADE 7 to Chassis Ground Fig 4 Using a short length of 1mm brown wire link Blades 1 and 5 of the IEC input Using a short length of 1mm blue wire link Blades 4 and 6 of the IEC input These joints should be insulated with heat shrink sleeving Take approx 75mm Green Yellow wire and solder one end to Blade 7 of the IEC input and the other to a solder tag ...

Page 7: ...eving 100 120V Twist all the primary wires together pass them through the piercing in the chassis and solder the blue and purple wires to pin 3 and the brown and grey wires to pin 2 of the IEC input These joints should be insulated with heat shrink sleeving Making sure that the power switch is positioned nearest the outside of the chassis fit the IEC input into the hole in the chassis and snap it ...

Page 8: ...ce to fit components with the lowest profile eg links or low value resistors first and those with the highest profile eg large capacitors last FIT THE VALVE BASES The valve bases should be fitted to the component side of the PCB Make sure that you solder the legs on both sides of the PCB to give a secure mechanical as well as electrical joint FIT THE PCB PINS We have highlighted the PCB pin positi...

Page 9: ...des D1 D2 D3 D4 Orientation is very important note that the stripe on the diode matches with the stripe on the PCB legend for correct polarity FIT THE RESISTORS Elevate the higher power resistors R1 R2 R4 R6 R11 R13 R17 R18 R19 from the PCB by at least 10mm as they require a cooling flow of air around them Figs 8 10 Fig 10 ...

Page 10: ...the insulation of the wires Taking twisted pairs of brown and grey wire use the brown wires to connect point HTR next to pin HTR OR to HTR at V2 and onwards to HTR at V1 Similarly using the grey wires connect HTR next to pin HTR OR to HTR at V2 and onwards to HTR at V1 HTR and HTR are in fact misprints on the PCB the heaters operate on AC but the markings make it easier to wire the heaters of both...

Page 11: ...Fig 11 Heater Links Fig 10 Populated Printed Circuit Board 10 WDHD3S Kit Assembly Instructions ...

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