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Caledonian Audio

Phono Classique Assembly Manual

25

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Figure 18 - The orientations of the PCBs

3.5 Transformers

There are two power transformers included in the kit. One for supplying power
to the valve heaters (marked as Transformer 1 in Figure 12) and the other one
for powering the amplifier board (marked as Transformer 2 in Figure 12).

The position and orientation of the transformers matter as they will simplify the
wiring at the later stage, so please take note.

Each fixing on the transformers consists of an M4 screw

[FIX-3]

, a washer

[FIX-

5]

and a locknut

[FIX-3]

.

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Содержание Phono Classique

Страница 1: ...Assembly Manual Phono Classique Version 1 0 Caledonian Audio...

Страница 2: ...2 Version History Version Date Changes 1 0_draft 3 August 2020 Initial creation 1 0 18 October 2020 Reviewed and corrected...

Страница 3: ...are rated in relation to another voltage reference level but in reality the potential difference between the 12V as an example and ground earth might be anywhere up to 400V So please treat any 6 3V o...

Страница 4: ...25 3 6 Ground Lift Isolator Circuit Not Included 27 3 7 Ground Lug 27 4 Wiring Connecting Cables 28 4 1 Power Cables 28 4 1 1 Safety Earth 28 4 1 2 IEC Socket to the Power Switch 28 4 1 3 Main Switch...

Страница 5: ...ed to the mounting plate 24 Figure 17 PCBs mounted using the standoffs 24 Figure 18 The orientations of the PCBs 25 Figure 19 Transformers mounted onto the plate 26 Figure 20 Heater transformer 26 Fig...

Страница 6: ...6 Figure 32 Audio level cables and star earth 36...

Страница 7: ...versions or revisions might be applicable but please check with us first 1 2 Assumptions 1 Only parts and devices which are part of this kit are used in the build Caledonian Audio will not support us...

Страница 8: ...supply and phono amplifier board 2 Mount 2 power transformers onto mounting board 3 Mount all connectors power and audio 4 Install power cables 5 Install hookup cables Components and devices shown in...

Страница 9: ...nections that we will have to make on to the PCBs You will have to decide if you are to use PCB terminal blocks or to solder cables directly into the through hole pads In some parts of the work you wi...

Страница 10: ...the heatsink itself If you solder the chip onto the PCB first without having it mounted on the supplied heatsink depending on the height of the legs inserted into the holes you might have some alignme...

Страница 11: ...ng up vertically R4 R5 Voltage divider network R4 R5 and C5 forms a voltage divider network which is used as a reference point to raise the 12VDC heater filament R6 Bleeder see note Do not populate R6...

Страница 12: ...on the PCB So before soldering them onto the board make sure that they are correct The electrolytic capacitors are C1 C2 C3 C4 C5 C7 C8 C9 C11 C12 As usual follow the drawing on the PCB silkscreen whi...

Страница 13: ...y using the insulating kit mount the voltage regulator onto the heatsink Don t tighten it up yet for now you might have to alter the position slightly Don t forget to use the plastic bushing and insul...

Страница 14: ...verything you can then solder the legs of the voltage regulator Additionally you can also solder the two pins of the heatsink onto the PCB Figure 4 Supplied heatsink 2 1 5 Common Mode Choke EMI filter...

Страница 15: ...Caledonian Audio Phono Classique Assembly Manual 15 15 Figure 6 Power supply PCB with heatsink attached to the voltage regulator Figure 7 Another view of the completed power supply PCB...

Страница 16: ...components on the normal silkscreen components side which enables us to mount the PCB in such a way that the valves will be protruded outside the case check the front page picture 2 2 1 Valve Holders...

Страница 17: ...e 8 Phono amp PCB with valve sockets installed Note that valve sockets might differ to the ones supplied in your kit 2 2 2 Soldering Resistors Now turn the PCB to side A All components will be mounted...

Страница 18: ...ering Capacitors Place and solder all capacitors It is a good practice to start off with the smallest of the components and move on to the larger ones As usual please observe the polarities of the ele...

Страница 19: ...Manual 19 19 Figure 10 Phono amp with capacitors installed You should now have a complete phono amp PCB 3 Mounting Parts on The Mounting Plate Now that we have prepared the PCBs we can start mounting...

Страница 20: ...o place the plate with the bottom part on the top as shown in Figure 11 mounting plate bottom view and Figure 12 Placement of all parts and PCBs on the mounting plate as a reference to the location of...

Страница 21: ...parts and PCBs on the mounting plate 3 1 IEC Power Socket By using a pair of countersunk M3 screw Fix 8 and M3 Hex nut Fix 9 secure the IEC power socket IEC 1 onto the plate as shown in Figure 13 IEC...

Страница 22: ...22 Figure 13 IEC socket mounted Figure 14 IEC socket mounted front view note the orientation...

Страница 23: ...nectors do not matter too much Just bear in mind that there will be two connectors for audio input from turntable and two for audio output going to line level amplifier See Figure 15 as an example Fig...

Страница 24: ...the plate The PCBs will be mounted using M3 steel hex standoff FIX 4 and two sets of screws FIX 2 and FIX 6 By referring to Figure 12 Figure 17 and Figure 18 mount both of the PCBs onto the mounting...

Страница 25: ...ng power to the valve heaters marked as Transformer 1 in Figure 12 and the other one for powering the amplifier board marked as Transformer 2 in Figure 12 The position and orientation of the transform...

Страница 26: ...26 Figure 19 Transformers mounted onto the plate Figure 20 Heater transformer...

Страница 27: ...k If nothing is used on this space the drill hole on the mounting board can be filled with a simple screw and nut 3 7 Ground Lug Following the tradition of all phono preamp we will provide a ground lu...

Страница 28: ...Power Cables 4 1 1 Safety Earth Start with connecting the ground safety earth connection from the IEC socket to the chassis Figure 22 Please note that this connection should not be removed ever Do not...

Страница 29: ...ansformers We will now connect the output from the power switch to the primary winding terminals on both of the transformers There are two pairs of cables coming out from the power switch one pair goe...

Страница 30: ...30 Figure 24 Two pairs of cables connecting the output from the power switch to the two transformers...

Страница 31: ...Manual 31 31 Figure 25 Primary windings of Transformer 2 connected to the mains AC voltage from the switch Please note the wiring for 230VAC system Figure 26 Primary windings of Transformer 1 connecte...

Страница 32: ...e transformer There are two pairs of 0 115VAC output terminals We will wire them in series to get the 0 230VAC Again please refer to the wiring diagram Connect the cables from the transformer to J1 an...

Страница 33: ...rom J2 to J10 in Figure 30 4 1 9 Heater Power Supply to Heaters 12 6VDC We will now connect the heater supply voltage to the main board The three valves on the phono preamp boards will be supplied wit...

Страница 34: ...0 Valve heaters connected in parallel to the power supply PCB We have now completed the wiring for the power cables 4 2 Audio Cables There is very little audio cable wiring involved in this stage Howe...

Страница 35: ...ction easier we will divide the it into smaller sections 4 2 1 Left Audio In This is the audio input cable coming from the left channel RCA connector then into the preamp PCB Connect a pair of cable p...

Страница 36: ...needs to be connected to the star earth this should have been done in the previous step Figure 32 Audio level hookups and star earth 4 2 5 Star Earth There shouldn t be anything else needed to be wire...

Страница 37: ...ck the resistance between the earth pin on the IEC socket and all grounded metal parts on the amp They should read less than 0 1 ohms 4 Variac It is highly recommended to use a variac which will allow...

Страница 38: ...ular attention to the B and heater voltages When checking the heater voltages please remember that the voltages have been raised to around 90V above ground If you leave one probe on the chassis and th...

Страница 39: ...Caledonian Audio Phono Classique Assembly Manual 39 39 6 Questions Support If you have any question please get in touch with us at sales caledonianaudio co uk...

Страница 40: ...emale Female 20mm M3 x M3 FIX 4 You can use the nice shiny nickel plated ones FIX 2 to secure the standoffs onto the mounting plate as the heads are visible on the top side of the mounting plate Use t...

Страница 41: ...ique Assembly Manual 41 41 Star ground point Speaker binding post T 1 RS PRO Uninsulated Tin Plated Crimp Ring Terminal M4 Stud Size 0 5mm to 1 5mm 22AWG to 16AWG FIX 10 Audio input terminals RCA Phon...

Страница 42: ...ectrolytic Capacitor Through Hole 16 Dia x 25mm 105 C 16mm 7 5mm C7 Vishay 47 F 25V dc Aluminium Electrolytic Capacitor Through Hole 6 Dia x 10mm 85 C 6mm 15mm C4 C5 Vishay 100nF Polyester Capacitor P...

Страница 43: ...or RS PRO 5mm Pitch 3 Way PCB Terminal Block J16 power ground connector RS PRO 10mm Pitch Straight PCB Terminal Block PCB Mount 2 Way IV Integrated Power Supply PCB Components Label Specification B Su...

Страница 44: ...ultilayer Ceramic Capacitor MLCC 50V dc 10 Through Hole K104K10X7RF53L2 C11 C12 Rubycon 150 F 25V dc Aluminium Electrolytic Capacitor Through Hole 6 3 Dia x 11mm 105 C 6 3mm 2 5mm C13 EPCOS 100nF Poly...

Страница 45: ...Caledonian Audio Phono Classique Assembly Manual 45 45 V Wiring Diagram UK Europe 230VAC...

Страница 46: ...46 VI Wiring Diagram US 115VAC...

Страница 47: ...Caledonian Audio Phono Classique Assembly Manual 47 47 VII Schematics Phono Amp Circuit...

Страница 48: ...48 VIII Schematics Power Supply Circuit...

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