12ax7 phono tube preamplifier user manual (1)
TRANSCRIPT
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12AX712AX712AX712AX7 PhonoPhonoPhonoPhono
TubeTubeTubeTube Pre-AmplifierPre-AmplifierPre-AmplifierPre-Amplifier
UserUserUserUser ManualManualManualManual
AnalogAnalogAnalogAnalog MetricMetricMetricMetric
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Copyright© 2009 All Rights Reserved
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INTRODUCTIONINTRODUCTIONINTRODUCTIONINTRODUCTION
The circuit design is referenced to VTL phono tube preamplifier. It support both MM orMC phono input with RIAA compensation. It uses four 12AX7 vacuum tube in serialcommon-cathode configurations and buffer stage to provide sufficient voltage gain forweak phono input signal. The input impedance can be changed by the DIP switch. Thesignal paths of this PCB layout is designed in symmetry for both channels. Dedicatedpower rails, ground, and signal paths, althogether are taken into considerations so thatall are to minimize the parasitics, cross interference, and influence of RFI.
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FEATURESFEATURESFEATURESFEATURES
• Four 12AX7 vacuum tubes.
• Support both MM and MC.
• RIAA compensation.
• Input impedance can be varied by DIP switch or modified resistances by advancedusers.
• Two single-ended inputs and two single-ended outputs.
• Symmetric layout design and signal paths with minimum parasitic.
• Dedicated ground and power rails layout design.
• Four large reservoir decoupling capacitors for power rails.
• Power requirements: one 260V(100mA) DC and one 12.6V(2A) DC.
• PCB dimension: 20.2mm (W) x 13.6mm (L)
• PCB thickness: 2.4mm, double layer, 2oz copper.
PRECAUTIONSPRECAUTIONSPRECAUTIONSPRECAUTIONS
• Do not use any body parts to touch the metal parts of the kit after power up or poweroff, since the high voltage capacitors may not fully discharge. It may cause seriouselectric shock.
• Use a power transformer with fuse (1-3A) socket to limit the supply current in case ofshort circuit or incorrect assembly.
• Double check the assembled components with the schematics.
• Do not attempt the measure the voltage by multimeter with hand after power up. Theprobes of the multimeter should be mounted by some stands to the points of themeasurement before switching on the power supply.
• Turn off the power supply if you observe any smokes or hear strange sound comingout from the transformer or board. If there is short circuit, the transformer will begetting very hot shortly.
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PROCEDURESPROCEDURESPROCEDURESPROCEDURES
1. Hook up all the components according to the schematic, part list, and photos.Notice to the polarity of the high voltage electrolytic capacitors (C2, C2B, C3,C3B, C10, C10B, C13, C13B, C14, C14B). There are no polarities of the thin filmcapacitors.
2. MM mode: Pin 5 set off of SW1 and SW2.
3. MC mode: Pin 5 set on of SW1 and SW2.
4. Change input impedance: Pin 1, 2, 3, 4 and 6 of SW1 and SW2.
5. Apply either one or two 260V DC to J3 and 12.6V DC to J4. Connect the GND ofthese two connector. If you only have one 260V DC, connect the two '260V DC'pins together.
6. If everything work fine, the tubes will be led up gradually. Then, apply signals toconnectors J1 and obtain corresponding output signal at J2.
7. Enjoy it.
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CHECKLISTCHECKLISTCHECKLISTCHECKLIST
1. The polarity of the high voltage capacitorsC2, C2B, C3, C3B, C10, C10B, C13, C13B,C14, C14B.
2. The supply voltages at connectors (J3 and J4). Check the two DC pins of J3 whetherconnected to power supply.
3. Short the GND of J1, J2, J3 and J4 together.
If you have any problem in assembly, please contact us by email [email protected]
1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
Title
Number RevisionSize
C
Date: 6/4/2010 Sheet ofFile: G:\AnalogMetric\..\phono vtl.SchDoc Drawn By:
123
J3
B+GND
123
J1
MC IN
123
J5
Out
GND
GND
12
J4
HT
H1H2
Analog Metric
12AX7 Phono Pre-Amplifier ref VTL
41
2
3 5
V1A12AX7
6
7
8
V1B12AX7
41
2
3 5
V2A12AX7
6
7
8
V2B12AX7
41
2
3 5
V3A12AX7
6
7
8
V3B12AX7
41
2
3 5
V4A12AX7
6
7
8
V4B12AX7
47uF/50V
C20.1uF
C1 GND
2.7KR1
2.7K
R2
1.35
KR
3
510
R4
250
R5
47K
R7
GND123
J2
MM IN GND
R_MC
L_MC
R_MM
L_MM
H1
H2
1uFC3
1MR8
150pFC4
100pF
C5
0.01uF
C6
33pF
C7
240KR11
H1
H2
0.22uF
C8
2.7KR14
2uF
C9
1MR17
100K
R61W
274K
R101W
4.7K
R91W
2.7K
R121W
274K
R131W
980
R151W
980
R161W
120uF/400V
C13
47uF/400V
C14
GND GND
47K
R22
1W1K
R23
1W
B1+B2+
B1+
ROUT
LOUT
5600pF
C11
680K
R19
1K
R21
47K
R201600pF
C12
510R18
GND
220uF/50V
C10
47uF/50V
C2B0.1uF
C1B GND
2.7KR1B
2.7K
R2B
1.35
KR
3B
510
R4B
250
R5B
47K
R7B
GND
H1
H2
1uFC3B
1MR8B
150pFC4B
100pF
C5B
0.01uF
C6B
33pF
C7B
240KR11B
H1
H2
0.22uF
C8B
2.7KR14B
2uF
C9B
1MR17B
100K
R6B1W
274K
R10B1W
4.7K
R9B1W
2.7K
R12B1W
274K
R13B1W
980
R15B1W
980
R16B1W
120uF/400V
C13B
47uF/400V
C14B
GND GND
47K
R22B
1W1K
R23B
1W
B2+
5600pF
C11B
680K
R19B
1K
R21B
47K
R20B1600pF
C12B
510R18B
GND
220uF/50V
C10B
R_MM
R_MC
L_MC
L_MM
ROUT
LOUT
1 2 3 4 5 678910
ON DIP
1112
1 2 3 4 5 6
SW1
1 2 3 4 5 678910
ON DIP
1112
1 2 3 4 5 6
SW2
P0C101 P0C102
P0C1B01 P0C1B02
P0C201 P0C202
P0C2B01 P0C2B02
P0C301 P0C302
P0C3B01 P0C3B02
P0C401 P0C402
P0C4B01 P0C4B02
P0C501 P0C502
P0C5B01 P0C5B02
P0C601 P0C602
P0C6B01 P0C6B02
P0C701 P0C702
P0C7B01 P0C7B02
P0C801 P0C802
P0C8B01 P0C8B02
P0C901 P0C902
P0C9B01 P0C9B02
P0C1001 P0C1002
P0C10B01 P0C10B02
P0C1101 P0C1102
P0C11B01 P0C11B02
P0C1201 P0C1202
P0C12B01 P0C12B02
P0C1301
P0C1302
P0C13B01
P0C13B02
P0C1401
P0C1402
P0C14B01
P0C14B02
P0J101
P0J102
P0J103
P0J201
P0J202
P0J203
P0J301
P0J302
P0J303
P0J401
P0J402
P0J501
P0J502
P0J503
P0R101
P0R102
P0R1B01
P0R1B02
P0R201
P0R202
P0R2B01
P0R2B02
P0R301
P0R302
P0R3B01
P0R3B02
P0R401
P0R402
P0R4B01
P0R4B02
P0R501
P0R502
P0R5B01
P0R5B02
P0R601
P0R602
P0R6B01
P0R6B02
P0R701
P0R702
P0R7B01
P0R7B02
P0R801
P0R802
P0R8B01
P0R8B02
P0R901
P0R902
P0R9B01
P0R9B02
P0R1001
P0R1002
P0R10B01
P0R10B02
P0R1101
P0R1102
P0R11B01
P0R11B02
P0R1201
P0R1202
P0R12B01
P0R12B02
P0R1301
P0R1302
P0R13B01
P0R13B02
P0R1401
P0R1402
P0R14B01
P0R14B02
P0R1501
P0R1502
P0R15B01
P0R15B02
P0R1601
P0R1602
P0R16B01
P0R16B02
P0R1701
P0R1702
P0R17B01
P0R17B02
P0R1801
P0R1802
P0R18B01
P0R18B02
P0R1901 P0R1902
P0R19B01 P0R19B02
P0R2001 P0R2002
P0R20B01 P0R20B02
P0R2101 P0R2102
P0R21B01 P0R21B02
P0R2201 P0R2202
P0R22B01 P0R22B02
P0R2301 P0R2302
P0R23B01 P0R23B02
P0SW101
P0SW102
P0SW103
P0SW104
P0SW105
P0SW106
P0SW107
P0SW108
P0SW109
P0SW1010
P0SW1011
P0SW1012
P0SW201
P0SW202
P0SW203
P0SW204
P0SW205
P0SW206
P0SW207
P0SW208
P0SW209
P0SW2010
P0SW2011
P0SW2012
P0V1A01
P0V1A02
P0V1A03
P0V1A04
P0V1A05
P0V1B06
P0V1B07
P0V1B08
P0V2A01
P0V2A02
P0V2A03
P0V2A04
P0V2A05
P0V2B06
P0V2B07
P0V2B08
P0V3A01
P0V3A02
P0V3A03
P0V3A04
P0V3A05
P0V3B06
P0V3B07
P0V3B08
P0V4A01
P0V4A02
P0V4A03
P0V4A04
P0V4A05
P0V4B06
P0V4B07
P0V4B08
P0J303
P0R2301
P0V2B06
N0B1+
P0J302
P0R23B01
P0V4B06
N0B2+
P0C4B01
P0C401
P0C13B02
P0C1302
P0C14B02
P0C1402
P0J102
P0J202
P0J301
P0J502
P0R1B01
P0R101
P0R8B01
P0R801
P0R9B01
P0R901
P0R11B01
P0R1101
P0R12B01
P0R1201
P0R16B01
P0R1601
P0R17B01
P0R1701
P0R18B02
P0R1802
P0SW101
P0SW102
P0SW103
P0SW104
P0SW106
P0SW201
P0SW202
P0SW203
P0SW204
P0SW206
P0V1A02
P0V3A02
P0J402
P0V1A04
P0V2A04
P0V3A04
P0V4A04
N0H1
N0H1
N0H1
N0H1
N0H1
P0J401
P0V1A05
P0V2A05
P0V3A05
P0V4A05
N0H2
N0H2
N0H2 N0H2
N0H2
P0C9B02
P0C12B01
P0J503
P0R17B02
P0R20B01
N0LOUT
N0LOUT
P0C1B01
P0C2B01
P0J203 N0L0MC
N0L0MC
P0C4B02
P0C5B02
P0J201
P0R7B02
P0R8B02
P0SW205
P0V3B07
N0L0MM
N0L0MM
P0C1B02
P0C2B02
P0R1B02
P0R2B02
P0R3B02
P0R4B02
P0R5B02
P0V3A03
P0C102
P0C202
P0R102
P0R202
P0R302
P0R402
P0R502
P0V1A03
P0C3B01
P0SW208
P0C3B02
P0R6B01
P0V3A01
P0C301
P0SW108
P0C302
P0R601
P0V1A01
P0C5B01
P0C7B02
P0C10B01
P0R9B02
P0V3B08
P0C501
P0C702
P0C1001
P0R902
P0V1B08
P0C6B01 P0R10B01
P0V3B06 P0C6B02
P0R11B02
P0V4A02
P0C601 P0R1001
P0V1B06 P0C602
P0R1102
P0V2A02
P0C7B01
P0C8B01
P0R13B01
P0V4A01
P0C701
P0C801
P0R1301
P0V2A01
P0C8B02
P0R14B02
P0V4B07
P0C802
P0R1402
P0V2B07
P0C9B01
P0R15B02
P0V4B08
P0C901
P0R1502
P0V2B08
P0C10B02
P0C11B02
P0R18B01 P0R19B02
P0C1002
P0C1102
P0R1801 P0R1902
P0C11B01
P0R19B01 P0R20B02
P0R21B02
P0C1101
P0R1901 P0R2002
P0R2102
P0C12B02 P0R21B01
P0C1202 P0R2101
P0C13B01
P0R6B02
P0R22B02
P0C1301
P0R602
P0R2202
P0C14B01
P0R10B02
P0R13B02
P0R22B01 P0R23B02
P0C1401
P0R1002
P0R1302
P0R2201 P0R2302
P0R2B01
P0SW2012
P0R201
P0SW1012
P0R3B01
P0SW2011
P0R301
P0SW1011
P0R4B01
P0SW2010
P0R401
P0SW1010
P0R5B01
P0SW209
P0R501
P0SW109
P0R7B01
P0SW207
P0R701
P0SW107
P0R12B02
P0V4A03
P0R1202
P0V2A03
P0R14B01
P0R15B01
P0R16B02
P0R1401
P0R1501
P0R1602
P0C902
P0C1201
P0J501
P0R1702
P0R2001
N0ROUT
N0ROUT
P0C101
P0C201
P0J103 N0R0MC
N0R0MC
P0C402
P0C502
P0J101
P0R702
P0R802
P0SW105
P0V1B07
N0R0MM
N0R0MM
N0B1+ P0J303
P0R2301
P0V2B06
N0B2+ P0J302
P0R23B01
P0V4B06
P0C4B01
P0C401
P0C13B02
P0C1302
P0C14B02
P0C1402
P0J102
P0J202
P0J301
P0J502
P0R1B01
P0R101
P0R8B01
P0R801
P0R9B01
P0R901
P0R11B01
P0R1101
P0R12B01
P0R1201
P0R16B01
P0R1601
P0R17B01
P0R1701
P0R18B02
P0R1802
P0SW101
P0SW102
P0SW103
P0SW104
P0SW106
P0SW201
P0SW202
P0SW203
P0SW204
P0SW206
P0V1A02
P0V3A02
N0H1
P0J402
P0V1A04
P0V2A04
P0V3A04
P0V4A04
N0H2
P0J401
P0V1A05
P0V2A05
P0V3A05
P0V4A05
N0LOUT P0C9B02
P0C12B01
P0J503
P0R17B02
P0R20B01
N0L0MC
P0C1B01
P0C2B01
P0J203
N0L0MM
P0C4B02
P0C5B02
P0J201
P0R7B02
P0R8B02
P0SW205
P0V3B07
P0C1B02
P0C2B02
P0R1B02
P0R2B02
P0R3B02
P0R4B02
P0R5B02
P0V3A03
P0C102
P0C202
P0R102
P0R202
P0R302
P0R402
P0R502
P0V1A03
P0C3B01
P0SW208
P0C3B02
P0R6B01
P0V3A01
P0C301
P0SW108
P0C302
P0R601
P0V1A01
P0C5B01
P0C7B02
P0C10B01
P0R9B02
P0V3B08
P0C501
P0C702
P0C1001
P0R902
P0V1B08
P0C6B01 P0R10B01
P0V3B06 P0C6B02
P0R11B02
P0V4A02
P0C601 P0R1001
P0V1B06 P0C602
P0R1102
P0V2A02
P0C7B01
P0C8B01
P0R13B01
P0V4A01
P0C701
P0C801
P0R1301
P0V2A01
P0C8B02
P0R14B02
P0V4B07
P0C802
P0R1402
P0V2B07
P0C9B01
P0R15B02
P0V4B08
P0C901
P0R1502
P0V2B08
P0C10B02
P0C11B02
P0R18B01 P0R19B02
P0C1002
P0C1102
P0R1801 P0R1902
P0C11B01
P0R19B01 P0R20B02
P0R21B02
P0C1101
P0R1901 P0R2002
P0R2102
P0C12B02 P0R21B01
P0C1202 P0R2101
P0C13B01
P0R6B02
P0R22B02
P0C1301
P0R602
P0R2202
P0C14B01
P0R10B02
P0R13B02
P0R22B01 P0R23B02
P0C1401
P0R1002
P0R1302
P0R2201 P0R2302
P0R2B01
P0SW2012
P0R201
P0SW1012
P0R3B01
P0SW2011
P0R301
P0SW1011
P0R4B01
P0SW2010
P0R401
P0SW1010
P0R5B01
P0SW209
P0R501
P0SW109
P0R7B01
P0SW207
P0R701
P0SW107
P0R12B02
P0V4A03
P0R1202
P0V2A03
P0R14B01
P0R15B01
P0R16B02
P0R1401
P0R1501
P0R1602
N0ROUT P0C902
P0C1201
P0J501
P0R1702
P0R2001
N0R0MC
P0C101
P0C201
P0J103
N0R0MM
P0C402
P0C502
P0J101
P0R702
P0R802
P0SW105
P0V1B07
AnalogAnalogAnalogAnalog MetricMetricMetricMetric12AX7 Phono PreAmplifier (Stereo) ref VTLComponentsComponentsComponentsComponents ValuesValuesValuesValues QuantityQuantityQuantityQuantity RemarkRemarkRemarkRemarkC1, C1B 0.1uF/100V 2 Metalized Film CapC2, C2B 47uF/50V 2 Electrolytic CapC3, C3B 1uF/400V 2 MKP Film CapC4, C4B 150pF/250V 2 Metalized Film CapC5, C5B 100pF/250V 2 Metalized Film CapC6, C6B 10nF/250V 2 Metalized Film CapC7, C7B 33pF/250V 2 Metalized Film CapC8, C8B 0.22uF/250V 2 MKP Film CapC9, C9B 2uF/250V 2 MKP Film CapC10, C10B 220uF/50V 2 Electrolytic CapC11, C11B 5.6nF/50V 2 Metalized Film CapC12, C12B 1.6nF/50V 2 Metalized Film CapC13, C13B 120uF/400V 2 Electrolytic CapC14, C14B 47uF/400V 2 Electrolytic CapR1, R1B, R2, R2B 2.7K 1/4W 4R3, R3B 1.35K 1/4W 2R4, R4B, R18, R18B 510R 1/4W 4R5, R5B 250R 1/4W 2R6, R6B 100K 1W 2R7, R7B, R20, R20B 47K 1/4W 4R8, R8B 1M 1/4W 2R9, R9B 4.7K 1W 2R10, R10B, R13, R13B 274K 1W 2R11, R11B 240K 1/4W 2R12, R12B 2.7K 1W 2R15, R15B, R16, R16B, R23, R23B1K 1W 6R14, R14B, R17, R17B 1M 1/4W 4R19, R19B 680K 1/4W 2R21, R21B 1K 1/4W 2R22, R22B 47K 1W 2V1,V2, V3, V4 12AX7 4Mini 9 Pin PCB Mount Tube Socket 4SW1, SW2 DIP12 22-Pin Connector 13-Pin Connector 43mm screw &copper rod 4PCB 1