Arcam Alpha 10p User manual

H ALALPHA 10/10P SERVICE MANUAL

ALPHA 10/10P SERVICE MANUAL

CIRCUIT DESCRIPTION

The mother PCB is common for both the A10 and A10P with the exception of the input mode switch and pre-amp

output mute relay which are only fitted to the A10 and the power/standby LED and links to parallel the input

connections to what would otherwise be the pre-amp output for use with a mono link. The amplifier is based on the

D290/Alpha 9 design but with lower gain, a higher current and higher voltage driver stage and a high power output

stage. The current servo has been improved over the Alpha 9 to be output device independent. A micro supervises

the amplifier state, switch state and remote control functions. Provision is made for an additional 3rd channel PCB to

be added with power supply and protection circuitry access.

Input stage

The input connections are taken either from the pre-amp connector, LK12X, or the external power amp input on the

A10 depending on the position of SW1. On the A10P, the input is taken from the external power amp input only with

provision for a mono shorting link by having two parallel input connectors. On the A10, there is a mute relay on the

pre-amp outputs which are always connected to the pre-amp connector, LK12X.

The signal is passed through a low pass filter with a -3dB point of 550KHz at normal gain and 740KHz at low gain.

The gain is selected by SW2. C72 and C74 are d.c. blocking capacitors with a -3dB point of 0.7Hz. A d.c. error

correction current is injected into the base of Q19 and 26 from the voltage servo Z3 and 4, to null any voltage offset at

the amplifier output.

The input and voltage amplifier stages both run off regulated 15 Volt suppies. The input stage is an NPN differential

input, Q18, 19, 25 and 26, with an adjustable current source, Q21 and 28 which sets the quiescent current through all

the stages but specifically the output stage. C37, R58, C49 and R66 keep the input stage and voltage amplifier stable.

Q52, 53, 54 and 55 form a current mirror to ensure that the differential input is balanced during normal operation.

Voltage Amplifier

The voltage amplifier consists of another differential pair, Q48, 49, 50 and 51. Q48 and 50 are the positive pulling side

of the voltage amplifier output and Q49 and 51 pull negative via a current mirror Q8, 9, 10 and 11. The network C12,

36, R74 and 77 give the current mirror gain to compensate for the fact that Q49 and Q51 is only driven from the low-

impedance side of the input stage current mirror. The network ensures a fast, symmetrical slew rate of the voltage

amplifier stage.

Network C69, 70, R172, 174 ensure the overall stability of the amplifier by reducing the open loop gain at high

frequencies.

Second Voltage Amplifier and Driver Stage

Q33, 36, 41 and 44 are the next voltage amplifier stage with feedback applied from the output coupled to their

emitters. This stage runs on the full supply rail voltages and splits the level shifts the signal via Q2, 3, 5 and 6 to drive

the gates of the output MOSFETs, Q13, 14, 15 and 16. Q2 and 3 simply buffer the inverted signal at the collector of

Q36 to drive the low side MOSFETs, Q13 and 15. Q5 and 6 invert the inverted signal at the collector of Q41 and Q44

to drive the high side MOSFETs, Q14 and 16. To ensure that the high side drive is able to swing far enough to ensure

the high side MOSFETs can be driven to saturation, a bootstrap, C5, D41 R57, C78 and D22 boosts the driver stage

power supply during positive excursions of the amplifier output. This is inactive at low output voltage swings as any

distortion induced by the network would be more audible at such levels.

Output Stage

Both the high and low side output devices feature over-current protection, Q17, 23, 24, 30 which clamps the gate of

the MOSFET it protects. A high current is permitted through the MOSFET for a few milliseconds after which time the

current is throttled down to about 10A peak. A second current sensing network, Q32 and Q35 activates the

over-current protection cut-out if the low side is current limiting for too long, a few hundred milliseconds. The current

sensing resistors do not reduce the transconductance of the MOSFETs because the driver stage is referenced to the

MOSFET source. This means that the current through the driver stage is also sensed but this is insignificant as fas as

over-current protection sensing is concerned.

Auto-bias

H ALALPHA 10/10P SERVICE MANUAL

Figure 1Block Diagram of Power Amplifier

Sense Resistor

Comparitor Output

Measured Current (blue)

Other MOSFET

-ve MOSFET

50% 49% 52%

Bias correct Under Biassed Over Biassed

Figure 2 Auto-bias under dynamic conditions

The bias is regulated in two modes, one where these is no signal and one when signal is being split between the high

and low side MOSFETs when driving a alternating signal into a load.

Under static conditions, Z8 simply compares the sensed current, which includes the driver stage current, with a d.c.

mode reference of 13mV. The sense resistor is 0.11 so this corresponds to a current of about 120mA, some of which

is driver current. The current through the MOSFETs is about 80mA at this point. The comparator output is level shifted

to drive the integrating current servos Z3 and 4. This adjusts the amplifier current so that, on average, the bias level is

held at the reference point.

Under dynamic conditions, the low side drive will definitely be conducting more current than the reference (80mA) for

half the signal cycle and will be switched off for the other half. The result is a rectangle wave output from the

comparator, Z4.

When the output stage is biassed correctly (class AB operation) the comparator output toggles when the current

through the sense resistor for the -ve MOSFET is equal to the d.c. mode static reference level and at the half way

point of the signal. The result is a perfect square wave output from the comparator. Under these conditions, the +ve

MOSFET is also conducting the same amount of current at this point. If the bias level is lower than the reference, say,

at zero (class B operation) then the -ve MOSFET will spend slightly less than half the time conducting at or above the

reference level resulting in a rectangle wave output from the comparator at a duty cycle slightly less than 50%. If the

bias level is higher than the reference then the -ve MOSFET will spend slightly more than half the time conducting at

or above the reference level resulting in a rectangle wave output at a duty cycle slightly more than 50%. The change

in duty cycle away from 50% causes the integrator, Z3 and Z4 to adjust the bias level via the bias adjusting

transistors, Q22 and 29.

The integrator has a reference, the a.c. mode dynamic reference, for a bias point slightly higher than for a 50% duty

cycle. This eliminates the possibility of the bias being slowly throttled due to component tolerance mismatch resulting

in a reference which would pull the servo down. A high dynamic bias reference level simply stabilises the bias slightly

higher than the static reference but a low dynamic reference causes the bias to drift down to complete throttle.

This system works if the signal is a.c., symmetrical and is not a rectangle wave. Certainly, only a.c. signals are passed

H ALALPHA 10/10P SERVICE MANUAL

Figure 3 Micro Block Diagram

through the amplifier due to C72 and 74 d.c. blocking capacitors and on average the signal will be symmetrical. Any

short-term asymmetry will be ironed out by the long time constant of the integrator.

Main Power Supply

The main power supply is regulated in two stages. First it is pre-regulated by Q1 and 4 to about 11V less than the

main supply rails. This supply is made available to an option board. The maximum load on these supplies is 150mA

for less than 2W dissipation in Q1 and 4. These supplies are then regulated to +/-15V by Z1 and 2. These supplies are

used by the input stages of the power amplifiers including any 3rd channel board, the pre-amplifier board and an

optional phono amplifier board. The positive voltage regulator, Z1, has a larger heatsink than Z2 because the phono

board consumes much more current from the positive rail than from the negative rail.

Control Micro

The control micro performs the following functions...

‚Switches the amplifier on or off,

‚Mutes the speakers #1 or #2 or the pre-amp output,

‚Monitors the heatsink temperature,

‚Monitors RF content of speaker outputs,

‚Handles the remote bus and infra red remote input,

‚Reports fault conditions to the main display and LED,

‚Reads the speaker and power switch positions.

The control micro runs of the constant power supply from standby transformer, TX2. This enables the amplifier to be

switched on or off remotely from the remote bus or, in the case of the integrated amplifier, from an infra red remote

control. This power supply is intended to supply all the digital circuitry in the amplifier including any option boards.

This is supplied at 8V to the other boards where it will be locally regulated to 5V as required.

The micro communicates with the display board via a multi-master I2C bus. This bus is used to report amplifier and

power status to the display micro and remote control commands received. It is also possible for the display micro to

control functions on the power amplifier board. The option board also uses this bus to receive any remote control

commands and communicate with the display micro.

The external remote bus handles raw information from infra red sensors with no demodulating. The remote bus input

can be echoed to the output through a buffer circuit. The incoming signal is demodulated by Z13. Raw signal is also

sent to the micro interrupt line, pin 12, for assessing the noise on the remote bus. In addition, any d.c. signal on the

remote bus is sensed on pin 2 of the micro in when it is not being used as an output to mute the hardware remote

echo buffer. The micro must modulate any output it sends to this bus with a carrier (37KHz). The output will drive one

or two series infra red LEDs directly.

The list below shows how various fault conditions can be deduced simply from the Power LED behaviour.

H ALALPHA 10/10P SERVICE MANUAL

•On power up, the protection should be engaged. This is checked after 3 seconds on pin 9 of Z9. If it isn't

happening, the unit shuts down with flashing red.

•If the protection does not clear after about 16 seconds on power-up the unit shuts down to flashing red. This

is usually caused by a voltage offset.

•Any main amp power loss detected on pin 26 after power-up causes a shut down to flashing red.

•Any RF detected on pin 3 results on immediate shut down to flashing red.

•Any protection fault detected after power up on pin 9 results in a flashing amber LED for about 16 seconds

max. If it has not cleared by then the unit is shut down to flashing red. Protection faults are caused by voltage

offset or over-current. Over-current should latch resulting in a shut down after 16 seconds. Voltage offsets

should clear themselves if brief.

•A temperature fault on pin 25 results in the power LED flashing slow amber and can last indefinitely until it

clears. When it clears the flashing will speed up until the protection times back in.

ALPHA 10P POWER AMP MAIN BOARD PARTS LIST

Ref No. Description Part No

C1 ELST 100U 100V 2N710B

C2 ELST 100U 100V 2N710B

C3 MLC 100N 50V X7R 10% SM 2C410

C4 ELST 100U 100V 2N710B

C5 ELST 100U 100V 2N710B

C6 ELST 22U 63V 2N622

C7 ELST 10U 50V 2N610

C8 ELST 22U 63V 2N622

C9 ELST 10U 50V 2N610

C10 ELST 10U 50V 2N610

C11 ELST 1U0 50V 2N510

C12 PPRO 4N7 63V 5% RA 2D247N

C13 SUPPR CAP 4N7 250V 2K247

C14 PPRO 150P 5% 63V RA 2D115

C15 ELST 10U 50V 2N610

C16 ELST 10U 50V 2N610

C17 ELST 10U 50V 2N610

C18 ELST TNC 10m 63V RA 40mm 2N910A

C19 ELST TNC 10m 63V RA 40mm 2N910A

C20 PPRO 4N7 63V 5% RA 2D247N

C21 PPRO 4N7 63V 5% RA 2D247N

C22 ELST 100U 25V 2N710

C23 ELST 100U 25V 2N710

C24 ELST 100U 25V 2N710

C25 ELST 100U 25V 2N710

C26 ELST 100U 25V 2N710

C27 ELST 100U 25V 2N710

C28 MLC 470P 100V NPO 5% SM 2C147

C29 MLC 470P 100V NPO 5% SM 2C147

C30 MLC 470P 100V NPO 5% SM 2C147

C31 MLC 100N 50V X7R 10% SM 2C410

C32 ELST 22U 63V 2N622

C33 ELST 22U 63V 2N622

C34 MLC 100N 50V X7R 10% SM 2C410

C35 PPRO 150P 5% 63V RA 2D115

C36 PPRO 4N7 63V 5% RA 2D247N

C37 PPRO 1N0 5% 63V RA 2D210

C38 PPRO 680P 63V 5% RA 2D168

C39 PPRO 680P 63V 5% RA 2D168

C40 MLC 10N 50V X7R 10% SM 2C310

C41 MLC 10N 50V X7R 10% SM 2C310

C42 MLC 10N 50V X7R 10% SM 2C310

C43 MLC 10N 50V X7R 10% SM 2C310

C44 SUPPR CAP 4N7 250V 2K247

C45 ELST 10U 50V 2N610

C46 SUPPR CAP 4N7 250V 2K247

C47 SUPPR CAP 4N7 250V 2K247

C48 ELST 3M3 25V 2N833

C49 PPRO 1N0 5% 63V RA 2D210

C50 ELST 1U0 50V 2N510

C51 ELST 220U 16V 2N722

C52 ELST 220U 16V 2N722

C53 ELST 220U 16V 2N722

C54 ELST 220U 16V 2N722

C55 PCRB 100N 100V 10% RA 5mm 2H410

C56 PCRB 100N 100V 10% RA 5mm 2H410

C57 PCRB 100N 100V 10% RA 5mm 2H410

C58 PCRB 100N 100V 10% RA 5mm 2H410

C59 PCRB 100N 100V 10% RA 5mm 2H410

C60 PCRB 100N 100V 10% RA 5mm 2H410

C61 PPRO 100P 63V 5% RA 2D110N

H ALALPHA 10/10P SERVICE MANUAL

C62 PPRO 100P 63V 5% RA 2D110N

C63 PPRO 150P 5% 63V RA 2D115

C64 PPRO 330P 5% 63V RA 2D133

C65 PPRO 150P 5% 63V RA 2D115

C66 PPRO 330P 5% 63V RA 2D133

C67 PEST 15N 63V 5% 2K315

C68 PEST 15N 63V 5% 2K315

C69 PSTY 56P 160V ENCAP 1PF% 2F056

C70 PSTY 56P 160V ENCAP 1PF% 2F056

C71 ELST NON POLAR 10UF 35V 2U610

C72 ELST NON POLAR 10UF 35V 2U610

C73 ELST NON POLAR 10UF 35V 2U610

C74 ELST NON POLAR 10UF 35V 2U610

C75 PEST 47N 63V 10% 2K347

C76 PEST 47N 63V 10% 2K347

C77 PEST 47N 63V 10% 2K347

C78 PEST 47N 63V 10% 2K347

C79 ELST NON POLAR 10UF 35V 2U610

C80 ELST NON POLAR 10UF 35V 2U610

C81 MLC 22P 100V NPO 5% SM 2C022

C82 MLC 22P 100V NPO 5% SM 2C022

C83 ELST 100U 25V 2N710

C84 MLC 100N 50V X7R 10% SM 2C410

C85 MLC 100N 50V X7R 10% SM 2C410

C86 MLC 100N 50V X7R 10% SM 2C410

C87 MLC 100N 50V X7R 10% SM 2C410

C88 MLC 100N 50V X7R 10% SM 2C410

C89 MLC 100N 50V X7R 10% SM 2C410

C90 ELST 10U 50V 2N610

C91 PPRO 680P 63V 5% RA 2D168

C92 MLC 10N 50V X7R 10% SM 2C310

C93 MLC 1N0 50V X7R 10% SM 2C210

C94 MLC 10N 50V X7R 10% SM 2C310

C95 ELST 10U 50V 2N610

C96 ELST 10U 50V 2N610

C97 MLC 100N 50V X7R 10% SM 2C410

C98 MLC 10N 50V X7R 10% SM 2C310

C99 CERD 10PF 63V 10% 2A010

C100 CERD 10PF 63V 10% 2A010

D1 ZENER 15V 400MW 3C11504

D2 ZENER 15V 400MW 3C11504

D3 ZENER 10V 400MW 3C11004

D4 ZENER 10V 400MW 3C11004

D5 ZENER 10V 400MW 3C11004

D6 ZENER 10V 400MW 3C11004

D7 ZENER 10V 400MW 3C11004

D8 ZENER 10V 400MW 3C11004

D9 ZENER 10V 400MW 3C11004

D10 RECT FIER 6A40 6A 400V 3B6A40

D11 RECT FIER 6A40 6A 400V 3B6A40

D12 RECT FIER 6A40 6A 400V 3B6A40

D13 RECT FIER 6A40 6A 400V 3B6A40

D14 RECT FIER 1N4003F 1A 200V 3B4003

D15 RECT FIER 1N4003F 1A 200V 3B4003

D16 SSDIODE 1N4148 75V 3A4148

D17 SSDIODE 1N4148 75V 3A4148

D18 RECT FIER 1N4003F 1A 200V 3B4003

D19 RECT FIER 1N4003F 1A 200V 3B4003

D20 SSDIODE 1N4148 75V 3A4148

D21 RECT FIER 1N4003F 1A 200V 3B4003

D22 RECT FIER 1N4003F 1A 200V 3B4003

D23 RECT FIER 1N4003F 1A 200V 3B4003

D24 RECT FIER 1N4003F 1A 200V 3B4003

D25 RECT FIER 1N4003F 1A 200V 3B4003

D26 SSDIODE 1N4148 75V 3A4148

D27 RECT FIER 1N4003F 1A 200V 3B4003

D28 SSDIODE 1N4148 75V 3A4148

D29 ZENER 4V7 400MW 3C04704

D30 SSDIODE 1N4148 75V 3A4148

D31 SSDIODE 1N4148 75V 3A4148

D32 SSDIODE 1N4148 75V 3A4148

D33 SSDIODE 1N4148 75V 3A4148

D34 SSDIODE 1N4148 75V 3A4148

D35 SSDIODE 1N4148 75V 3A4148

D36 SSDIODE 1N4148 75V 3A4148

D37 SSDIODE 1N4148 75V 3A4148

D38 SSDIODE 1N4148 75V 3A4148

D39 ZENER 12V 3W SM 3C03C12

D40 SSDIODE 1N4148 75V 3A4148

D41 ZENER 12V 3W SM 3C03C12

D42 SSDIODE 1N4148 75V 3A4148

D43 ZENER 5V6 400MW 3C05604

D44 ZENER 24V 3W SM 3C03C24

D45 RECT FIER 1N4003F 1A 200V 3B4003

D46 SSDIODE 1N4148 75V 3A4148

D47 SSDIODE 1N4148 75V 3A4148

H ALALPHA 10/10P SERVICE MANUAL

D48 ZENER 4V7 400MW 3C04704

D49 SSDIODE 1N4148 75V 3A4148

D50 ZENER 5V6 400MW 3C05604

F4 FUSE 20mm 2.5A AS C12256

F4 INS COVER PCB FUSEHOLDER F022

F4 FUSEHOLDER 20mm PCB 8S004

F5 FUSEHOLDER 20mm PCB 8S004

F5 INS COVER PCB FUSEHOLDER F022

HS1 HEATSINK CLIP TO220 13/8.6 DC/W F006

HS1 HEATSINK TO220 13 DEGC/W F005

HS3 HEATSINK TO220 CLIP 23DEG/W F004

HS5 CARBON THERMAL PAD E816MC

HS5 HEATSINK TO247 CL P 2DEGC/W E803HK E803HK

HS5 HEATSINK CLIP TO220 13/8.6 DC/W F006

HS7 HEATSINK TO220 CLIP 23DEG/W F004

HS9 HEATSINK CLIP TO220 13/8.6 DC/W F006

HS9 CARBON THERMAL PAD E816MC

HS9 HEATSINK TO247 CL P 2DEGC/W E803HK E803HK

HS10 HEATSINK TO220 CLIP 23DEG/W F004

HS11 HEATSINK TO247 CL P 2DEGC/W E803HK E803HK

HS11 HEATSINK CLIP TO220 13/8.6 DC/W F006

HS11 CARBON THERMAL PAD E816MC

HS12 CARBON THERMAL PAD E816MC

HS12 HEATSINK TO247 CL P 2DEGC/W E803HK E803HK

HS12 HEATSINK CLIP TO220 13/8.6 DC/W F006

HS13 HEATSINK TO220 CLIP 23DEG/W F004

HS14 HEATSINK TO220 CLIP 23DEG/W F004

L1 INDUCT 2U2 15x25mm AD2018 7D002A

L2 INDUCT 2U2 15x25mm AD2018 7D002A

L3 27mH NDUCTOR 7D327

LED1P LED RED/GREEN 5MM 3D002

LK9P JUMPER 4-WAY LEAD L836CA

O1 OPTO ISOLATOR 4N35 5T4N35

PCB PRINTED CIRCUIT BOARD L829PB

Q1 TRANS AUDIO DRIVER N 2SC5248 4B5248

Q2 TRANS AUDIO DRIVER N 2SC5248 4B5248

Q3 TRANS AUDIO DRIVER N 2SC5248 4B5248

Q4 TRANS AUDIO DRIVER P 2SA1964 4B1964

Q5 TRANS AUDIO DRIVER P 2SA1964 4B1964

Q6 TRANS AUDIO DRIVER P 2SA1964 4B1964

Q7 TRANS LF SS P SM BC856B 4A856B

Q8 TRANS LF SS N SM BC846B 4A846B

Q9 TRANS LF SS N SM BC846B 4A846B

Q10 TRANS LF SS N SM BC846B 4A846B

Q11 TRANS LF SS N SM BC846B 4A846B

Q12 TRANS LF SS N SM BC847B 4A847

Q13 TRANS POWER MOSFET IRPF360LC 4K360

Q14 TRANS POWER MOSFET IRPF360LC 4K360

Q15 TRANS POWER MOSFET IRPF360LC 4K360

Q16 TRANS POWER MOSFET IRPF360LC 4K360

Q17 TRANS LF SS N SM BC849B 4A849B

Q18 TRANS LF SS N SM BC849B 4A849B

Q19 TRANS LF SS N SM BC849B 4A849B

Q20 TRANS LF SS N SM BC849B 4A849B

Q21 TRANS LF SS N SM BC849B 4A849B

Q22 TRANS LF SS N SM BC849B 4A849B

Q23 TRANS LF SS N SM BC849B 4A849B

Q24 TRANS LF SS N SM BC849B 4A849B

Q25 TRANS LF SS N SM BC849B 4A849B

Q26 TRANS LF SS N SM BC849B 4A849B

Q27 TRANS LF SS N SM BC849B 4A849B

Q28 TRANS LF SS N SM BC849B 4A849B

Q29 TRANS LF SS N SM BC849B 4A849B

Q30 TRANS LF SS N SM BC849B 4A849B

Q31 TRANS LF SS N SM BC849B 4A849B

Q32 TRANS LF SS N 2SC2547 4A2546

Q33 TRANS LF SS P 2SA1085 4A1085

Q34 TRANS LF SS N SM BC849B 4A849B

Q35 TRANS LF SS N 2SC2547 4A2546

Q36 TRANS LF SS P 2SA1085 4A1085

Q37 TRANS LF SS N SM BC849B 4A849B

Q38 TRANS LF SS P 2SA1085 4A1085

Q39 TRANS LF SS N SM BC849B 4A849B

Q40 TRANS LF SS N 2SC2547 4A2546

Q41 TRANS LF SS N 2SC2547 4A2546

Q42 TRANS LF SS N SM BC847B 4A847

Q43 TRANS LF SS N 2SC2547 4A2546

Q44 TRANS LF SS N 2SC2547 4A2546

Q45 TRANS LF SS N 2SC2547 4A2546

Q46 TRANS LF SS N 2SC2547 4A2546

Q47 TRANS LF SS N 2SC2547 4A2546

Q48 TRANS LF SS P SM BC856B 4A856B

Q49 TRANS LF SS P SM BC856B 4A856B

Q50 TRANS LF SS P SM BC856B 4A856B

Q51 TRANS LF SS P SM BC856B 4A856B

Q52 TRANS LF SS P SM BC859B 4A859B

H ALALPHA 10/10P SERVICE MANUAL

Q53 TRANS LF SS P SM BC859B 4A859B

Q54 TRANS LF SS P SM BC859B 4A859B

Q55 TRANS LF SS P SM BC859B 4A859B

Q56 TRANS LF SS P SM BC859B 4A859B

Q57 TRANS LF SS P SM BC859B 4A859B

Q58 TRANS LF SS P SM BC859B 4A859B

Q59 TRANS LF SS N SM BC849B 4A849B

Q60 TRANS LF SS P SM BC859B 4A859B

Q61 TRANS LF SS N SM BC849B 4A849B

Q62 TRANS LF SS N SM BC849B 4A849B

R1 RES MF FU W3 1R0 5% NFR25 1G810

R2 RES MF FU W3 1R0 5% NFR25 1G810

R3 RES MF FU W3 1R0 5% NFR25 1G810

R4 RES CF 1W 330R 5% 1E133

R5 RES CF 1W 330R 5% 1E133

R6 RES CF W2 100R 5% 1D110

R7 RES MF FU W3 470R 5% NFR25 1G147

R8 RES MF FU W3 470R 5% NFR25 1G147

R9 RES MF FU W3 220R 5% NFR25 1G122

R10 RES MF FU W3 220R 5% NFR25 1G122

R11 RES MF FU W3 1K0 5% NFR25 1G210

R12 RES MF FU W3 470R 5% NFR25 1G147

R13 RES MF FU W3 470R 5% NFR25 1G147

R14 RES MF FU W3 220R 5% NFR25 1G122

R15 RES MF FU W3 220R 5% NFR25 1G122

R16 RES MF FU W3 1K0 5% NFR25 1G210

R17 RES MF FU W3 470R 5% NFR25 1G147

R18 RES MF FU W3 470R 5% NFR25 1G147

R19 RES MF FU W3 1K0 5% NFR25 1G210

R20 RES MF FU W3 1K0 5% NFR25 1G210

R21 RES MF FU W3 1K0 5% NFR25 1G210

R22 RESISTOR SM W8 220R 1% 1A122A

R23 RESISTOR SM W8 220R 1% 1A122A

R24 RESISTOR SM W8 2K4 1% 1A224A

R25 RESISTOR SM W8 2K4 1% 1A224A

R26 RESISTOR SM W4 22K 2% 1A322

R27 RESISTOR SM W4 22K 2% 1A322

R28 RESISTOR SM W4 10K 2% 1A310

R29 RESISTOR SM W4 1K5 2% 1A215

R30 RESISTOR SM W4 120K 2% 1A412

R31 RESISTOR SM W4 120K 2% 1A412

R32 RESISTOR SM W4 100K 2% 1A410

R33 RESISTOR SM W4 12K 2% 1A312

R34 RESISTOR SM W4 11K 2% 1A311

R35P RESISTOR SM W4 0R0 2% 1A000

R35 RESISTOR SM W4 1K0 2% 1A210

R36 RESISTOR SM W4 47K 2% 1A347

R37 RESISTOR SM W4 22K 2% 1A322

R38 RESISTOR SM W4 47K 2% 1A347

R39 RESISTOR SM W4 47K 2% 1A347

R40 RESISTOR SM W4 22K 2% 1A322

R41 RESISTOR SM W4 47K 2% 1A347

R42 RESISTOR SM W4 47K 2% 1A347

R43 RESISTOR SM W4 47K 2% 1A347

R44 RESISTOR SM W4 47K 2% 1A347

R45 RESISTOR SM W4 47K 2% 1A347

R46 RESISTOR SM W4 47K 2% 1A347

R47 RESISTOR SM W4 68K 2% 1A368

R48 RESISTOR SM W4 180R 2% 1A118

R49 RES CF W2 100R 5% 1D110

R50 RES MF FU W3 100R 5% NFR25 1G110

R51 RES MF FU W3 10R 5% NFR25 1G010

R52 RES MF FU W3 10R 5% NFR25 1G010

R53 RES CF 2W 220R 5% 1C122

R54 RES MF FU W3 100R 5% NFR25 1G110

R55 RES MF FU W3 10R 5% NFR25 1G010

R56 RES MF FU W3 10R 5% NFR25 1G010

R57 RES CF 2W 220R 5% 1C122

R58 RESISTOR SM W4 47R 2% 1A047

R59 RESISTOR SM W4 1M0 2% 1A510

R60 RESISTOR SM W4 1M0 2% 1A510

R61 RESISTOR SM W4 2M2 2% 1A522

R62 RESISTOR SM W4 1M0 2% 1A510

R63 RESISTOR SM W4 1M0 2% 1A510

R64 RESISTOR SM W4 2M2 2% 1A522

R65 RESISTOR SM W4 220R 2% 1A122

R65P RESISTOR SM W4 0R0 2% 1A000

R66 RESISTOR SM W4 47R 2% 1A047

R67 RESISTOR SM W4 47R 2% 1A047

R68 RESISTOR SM W4 10K 2% 1A310

R69 RESISTOR SM W4 10K 2% 1A310

R70 RESISTOR SM W4 10K 2% 1A310

R71 RESISTOR SM W4 4K7 2% 1A247

R72 RESISTOR SM W4 100R 2% 1A110

R73 RESISTOR SM W4 100R 2% 1A110

R74 RESISTOR SM W4 100R 2% 1A110

H ALALPHA 10/10P SERVICE MANUAL

R75 RESISTOR SM W4 1K0 2% 1A210

R76 RESISTOR SM W4 100R 2% 1A110

R77 RESISTOR SM W4 100R 2% 1A110

R78 RESISTOR SM W4 100R 2% 1A110

R79 RESISTOR SM W4 1K0 2% 1A210

R80P RESISTOR SM W4 0R0 2% 1A000

R80 RESISTOR SM W4 10K 2% 1A310

R81 RESISTOR SM W4 180R 2% 1A118

R82 RESISTOR SM W4 180R 2% 1A118

R83P RESISTOR SM W4 0R0 2% 1A000

R83 RESISTOR SM W4 100R 2% 1A110

R84 RES MO 3W 5% 0R22 KOASPR3 1Q922

R85 RES MO 3W 5% 0R22 KOASPR3 1Q922

R86 RES MO 3W 5% 0R22 KOASPR3 1Q922

R87 RES MO 3W 5% 0R22 KOASPR3 1Q922

R88 RES MO 3W 5% 0R22 KOASPR3 1Q922

R89 RES MO 3W 5% 0R22 KOASPR3 1Q922

R90 RES MO 3W 5% 0R22 KOASPR3 1Q922

R91 RES MO 3W 5% 0R22 KOASPR3 1Q922

R92 RESISTOR SM W4 47R 2% 1A047

R93 RESISTOR SM W4 47R 2% 1A047

R94 RESISTOR SM W4 150R 2% 1A115

R95 RESISTOR SM W4 47R 2% 1A047

R96 RESISTOR SM W4 47R 2% 1A047

R97 RESISTOR SM W4 150R 2% 1A115

R98 RESISTOR SM W4 27K 2% 1A327

R99 RESISTOR SM W4 470R 2% 1A147

R100 RESISTOR SM W4 4K7 2% 1A247

R101 RESISTOR SM W4 470R 2% 1A147

R102 RESISTOR SM W4 68K 2% 1A368

R103 RESISTOR SM W4 68K 2% 1A368

R104 RESISTOR SM W4 120K 2% 1A412

R105 RESISTOR SM W4 68K 2% 1A368

R106 RESISTOR SM W4 68K 2% 1A368

R107 RESISTOR SM W4 120K 2% 1A412

R108 RESISTOR SM W4 1K2 2% 1A212

R109 RESISTOR SM W4 1K2 2% 1A212

R110 RES CF 1W 1R5 5% 1E815

R111 RES CF 1W 1R5 5% 1E815

R112 RES CF 1W 5R6 5% 1E856

R113 RES CF 1W 5R6 5% 1E856

R114 RESISTOR SM W4 47R 2% 1A047

R115 RESISTOR SM W4 1K5 2% 1A215

R116 RESISTOR SM W4 10K 2% 1A310

R117 RESISTOR SM W4 1K5 2% 1A215

R118 RESISTOR SM W4 33K 2% 1A333

R119 RESISTOR SM W4 33K 2% 1A333

R120 RESISTOR SM W4 33K 2% 1A333

R121 RESISTOR SM W4 33K 2% 1A333

R122 RESISTOR SM W4 33K 2% 1A333

R123 RESISTOR SM W4 33K 2% 1A333

R124 RESISTOR SM W4 33K 2% 1A333

R125 RESISTOR SM W4 33K 2% 1A333

R126 RESISTOR SM W4 33K 2% 1A333

R127 RESISTOR SM W4 33K 2% 1A333

R128 RESISTOR SM W4 22K 2% 1A322

R129 RESISTOR SM W4 220R 2% 1A122

R130 RESISTOR SM W4 220R 2% 1A122

R131 RESISTOR SM W4 220R 2% 1A122

R132 RESISTOR SM W4 220R 2% 1A122

R133 RESISTOR SM W4 220R 2% 1A122

R134 RESISTOR SM W4 220R 2% 1A122

R135 RESISTOR SM W4 220R 2% 1A122

R136 RESISTOR SM W4 220R 2% 1A122

R137 RESISTOR SM W4 100K 2% 1A410

R138 RES MF FU W3 220R 5% NFR25 1G122

R139 RES MF FU W3 100R 5% NFR25 1G110

R140 RES MF FU W3 100R 5% NFR25 1G110

R141 RES MF FU W3 220R 5% NFR25 1G122

R142 RESISTOR SM W4 4K7 2% 1A247

R143 RES MF FU W3 220R 5% NFR25 1G122

R144 RES MF FU W3 100R 5% NFR25 1G110

R145 RES MF FU W3 100R 5% NFR25 1G110

R146 RES MF FU W3 220R 5% NFR25 1G122

R147 RESISTOR SM W4 470R 2% 1A147

R148 RES MF FU W3 1K0 5% NFR25 1G210

R149 RES MF FU W3 1K0 5% NFR25 1G210

R150 RES MF FU W3 470R 5% NFR25 1G147

R151 RES MF FU W3 1K0 5% NFR25 1G210

R152 RES MF FU W3 1K0 5% NFR25 1G210

R153 RES MF FU W3 470R 5% NFR25 1G147

R154 RESISTOR SM W4 2K2 2% 1A222

R155 RESISTOR SM W4 2K2 2% 1A222

R156 RESISTOR SM W4 2K2 2% 1A222

R157 RESISTOR SM W4 2K2 2% 1A222

R158 RESISTOR SM W4 1K5 2% 1A215

H ALALPHA 10/10P SERVICE MANUAL

R159 RESISTOR SM W4 1K5 2% 1A215

R160 RESISTOR SM W4 100R 2% 1A110

R161 RESISTOR SM W4 100R 2% 1A110

R162 RESISTOR SM W4 100R 2% 1A110

R163 RESISTOR SM W4 100R 2% 1A110

R164 RESISTOR SM W8 560R 1% 1A156A

R165 RESISTOR SM W8 560R 1% 1A156A

R166 RESISTOR SM W4 2K2 2% 1A222

R167 RESISTOR SM W4 2K2 2% 1A222

R168 RESISTOR SM W4 220R 2% 1A122

R169 RESISTOR SM W4 220R 2% 1A122

R170 RES MF W4 22K 1% 1H322

R171 RES MF W4 22K 1% 1H322

R172 RESISTOR SM W4 10R 2% 1A010

R173 RESISTOR SM W4 470R 2% 1A147

R174 RESISTOR SM W4 10R 2% 1A010

R175 RESISTOR SM W4 4K7 2% 1A247

R176 RESISTOR SM W4 470K 2% 1A447

R177 RESISTOR SM W4 470K 2% 1A447

R178 RESISTOR SM W4 470K 2% 1A447

R179 RESISTOR SM W4 470K 2% 1A447

R180 RESISTOR SM W8 47K 1% 1A347A

R181 RESISTOR SM W8 47K 1% 1A347A

R182 RESISTOR SM W8 2K7 1% 1A227A

R183 RESISTOR SM W8 2K7 1% 1A227A

R184 RESISTOR SM W4 100K 2% 1A410

R185 RESISTOR SM W4 100K 2% 1A410

R186 RESISTOR SM W4 120K 2% 1A412

R187 RESISTOR SM W8 8K2 1% 1A282A

R188 RESISTOR SM W8 8K2 1% 1A282A

R189 RESISTOR SM W4 27K 2% 1A327

R190 RESISTOR SM W4 1M0 2% 1A510

R191 RESISTOR SM W4 27K 2% 1A327

R192 RESISTOR SM W4 470K 2% 1A447

R193 RESISTOR SM W4 22R 2% 1A022

R194 RESISTOR SM W4 22R 2% 1A022

R195 RESISTOR SM W4 22R 2% 1A022

R196 RESISTOR SM W4 22R 2% 1A022

R197 RESISTOR SM W4 100K 2% 1A410

R198 RESISTOR SM W4 4K7 2% 1A247

R199 RES MF FU W3 1R0 5% NFR25 1G810

R200 RES CF 1W 2K7 5% 1E227

R201 RESISTOR SM W4 22K 2% 1A322

R202 RESISTOR SM W4 100K 2% 1A410

R203 RESISTOR SM W4 2K4 2% 1A224

R204 RESISTOR SM W4 10K 2% 1A310

R205 RES CF 1W 5% 6K8 1E268

R206 RESISTOR SM W4 100K 2% 1A410

R207 RESISTOR SM W4 100K 2% 1A410

R208 RESISTOR SM W4 470R 2% 1A147

R209 RESISTOR SM W4 4K7 2% 1A247

R210 RESISTOR SM W4 1K5 2% 1A215

R211 RESISTOR SM W4 4K7 2% 1A247

R212 RESISTOR SM W4 1K5 2% 1A215

R213 RESISTOR SM W4 47R 2% 1A047

R214 RESISTOR SM W4 4K7 2% 1A247

R215 RESISTOR SM W4 4K7 2% 1A247

R216 RESISTOR SM W4 1K0 2% 1A210

R217 RESISTOR SM W4 10K 2% 1A310

R218P RESISTOR SM W4 220R 2% 1A122

R218 RESISTOR SM W4 120K 2% 1A412

R219 RESISTOR SM W4 10K 2% 1A310

R220 RESISTOR SM W4 100K 2% 1A410

R221 RES CF 1W 470R 5% 1E147

R222 RESISTOR SM W4 100K 2% 1A410

R223 RESISTOR SM W4 10K 2% 1A310

R224 RES MF FU W3 10R 5% NFR25 1G010

R225 RESISTOR SM W4 10K 2% 1A310

R226 RESISTOR SM W4 10K 2% 1A310

R227 RES MF W4 10R 1% 1H010

R228 RES CF 1W 2K7 5% 1E227

R229 RES CF 1W 2K7 5% 1E227

R230 RESISTOR SM W4 47K 2% 1A347

R231 RESISTOR SM W4 47K 2% 1A347

R232 RESISTOR SM W4 1K0 2% 1A210

R233 RESISTOR SM W4 3K3 2% 1A233

R234 RESISTOR SM W4 3K3 2% 1A233

R235 RESISTOR SM W4 100K 2% 1A410

R236 RESISTOR SM W4 10K 2% 1A310

R237 RESISTOR SM W4 1K5 2% 1A215

R238 RESISTOR SM W4 1K8 2% 1A218

R239 RESISTOR SM W4 1K8 2% 1A218

RLY1 RLY SPST 24V SPKR A213

RLY2 RLY SPST 24V SPKR A213

RLY3 RLY SPST 24V SPKR A213

RLY4 RLY SPST 24V SPKR A213

H ALALPHA 10/10P SERVICE MANUAL

RLY6 RELAY MA NS 24V 10A A212

RLY7 RELAY MAINS DPDT 12V 5A A211

SH1 MAINS EMC SHIELD E5402

SH2 PHONO EMC SHIELD E808MC

SK1 PHONO SKT 4-WAY EMC GOLD 8D225

SK2 CAMCON BIND NG POST 4WAY GOLD 8D417G

SK3 CAMCON BIND NG POST 4WAY GOLD 8D417G

SK4 IEC MA NS CONN PCB NS PX 8A001

SK5 STEREO JACK PCB 8D301

SK6 22-WAY FFC CONN 8K8022

SK7 CAGE CLAMP 16A 3 WAY 8Q001

SK8 CAGE CLAMP 16A 4 WAY 8Q002

SK9 CAGE CLAMP 16A 1 WAY ARC003-236 8Q003

SK10 MIN JACK DUAL 3.5mm HSJ1002-01-1020 8D302

SKT1 JST 6 WAY HEADER 8K709

SW2 SW PUSH 2PCO A1008

SW3 SW PUSH 2PCO A1008

SW4 SW PUSH 2PCO A1008

SW5 SW PUSH 2PCO A1008

TH2 THERMISTOR MAINS SURGE 1T004

TH3 THERMISTOR MAINS SURGE 1T004

TX1 ALPHA10 AMP POWER TX 230V L831TX

TX2 ALPHA 10 AMP 230V/115V TRANSFORMER L825TX

X1 CER RESON 4.00MHz 7W005

Y1 TX WIRE RESTRAINT F185

Y2 TX WIRE RESTRAINT F185

Z1 IC VREG POS LM317T 5D317T

Z2 IC VREG POS LM337T 5D337

Z3 IC AUDIO SM DUAL TL072 5B072D

Z4 IC AUDIO SM DUAL TL072 5B072D

Z5 IC COMPARITOR TA7317P 5M7317

Z6 IC VREG POS 7805 5D7805

Z7 IC VREG POS 7808 5D7808

Z8 IC COMPARITOR SM DUAL LM393A 5M393AD

Z9 IC SOCKET 28 NARROW 8S028N

Z9 IC CMOS MICRO HT48R30 28-DIP-B-0 5B483028

Z10 IC THERMOSTAT SM LM56CIM 5M56

Z11 IC THERMOSTAT SM LM56CIM 5M56

Z12 IC CMOS EPROM 24C02 SM 5G2402

Z13 IC COMPARITOR SM DUAL LM393A 5M393AD

ALPHA 10 PREAMPLIFIER BOARD PARTS LIST

Ref No. Description Part No.

C1 ELST NON POLAR 10UF 35V 2U610

C2 ELST 22U 63V 2N622

C3 ELST NON POLAR 10UF 35V 2U610

C4 ELST 22U 63V 2N622

C8 MLC 1N0 50V X7R 10% SM 2C210

C9 MLC 1N0 50V X7R 10% SM 2C210

C10 PPRO 680P 5% 63V RA 2D168

C11 PPRO 680P 5% 63V RA 2D168

C13 MLC 47P 100V NPO 5% SM 2C047

C14 MLC 47P 100V NPO 5% SM 2C047

C15 MLC 47P 100V NPO 5% SM 2C047

C16 MLC 47P 100V NPO 5% SM 2C047

C17 MLC 47P 100V NPO 5% SM 2C047

C18 MLC 47P 100V NPO 5% SM 2C047

C19 MLC 47P 100V NPO 5% SM 2C047

C20 MLC 47P 100V NPO 5% SM 2C047

C21 MLC 47P 100V NPO 5% SM 2C047

C22 MLC 47P 100V NPO 5% SM 2C047

C23 MLC 47P 100V NPO 5% SM 2C047

C24 MLC 47P 100V NPO 5% SM 2C047

C25 MLC 47P 100V NPO 5% SM 2C047

C26 MLC 47P 100V NPO 5% SM 2C047

C31 ELST 22U 63V 2N622

C32 ELST 22U 63V 2N622

C33 MLC 1N0 50V X7R 10% SM 2C210

C34 MLC 1N0 50V X7R 10% SM 2C210

C35 MLC 1N0 50V X7R 10% SM 2C210

C36 MLC 1N0 50V X7R 10% SM 2C210

C37 MLC 1N0 50V X7R 10% SM 2C210

C38 MLC 1N0 50V X7R 10% SM 2C210

D1 ZENER 6V8 400MW 3C06804

D2 ZENER 6V8 400MW 3C06804

LK1 JUMPER 8-WAY LEAD FOR A10 PRE-AMP L823CA

LK2 JUMPER 8-WAY LEAD FOR A10 PRE-AMP L832CA

PCB PRINTED C RCUIT BOARD L832PB

PL6 16 WAY DIL P N HEADER 8K6316

R1 RESISTOR SM W4 1K0 2% 1A210

R2 RESISTOR SM W4 1K0 2% 1A210

R3 RESISTOR SM W4 56R 2% 1A056

This manual suits for next models

Popular Amplifier manuals by other brands

Magnat Audio

Magnat Audio EDITION FOUR Owner's manual/warranty document

Inter-m

Inter-m PA-2000A Operation manual

Yamaha

Yamaha TX6n owner's manual

Peavey

Peavey TNT 150 user guide

Bosch

Bosch LBB 1903/10 Installation and user instructions

Avocent

Avocent Emerge DA1200D Installer/user guide

Redgum

Redgum RGi35 operating instructions

Cambridge Audio

Cambridge Audio AXA25 user manual

Alpine

Alpine MRP-M200 owner's manual

Technical Pro

Technical Pro H1502UrBT user manual

FMS

FMS EMGZ307 operating manual

Racal Instruments

Racal Instruments 5601 user manual

Valcom

Valcom V-1094A Technical specifications

Cambridge Audio

Cambridge Audio 851D user manual

QSC

QSC 3800 Specifications

NAD

NAD C300 owner's manual

Rotel

Rotel RMB-1077 owner's manual

Peavey

Peavey Monitor 300 Series operating guide

Arcam Alpha 10P User manual

Popular Amplifier manuals by other brands