MT-2 Boss Metal Zone Schematic

Technical specification:
    Input Impedance: 1MΩ
    Output Impedance: 1kΩ
    Recommended Load Impedance: 10kΩ or greater
    Equivalent Input Noise Level: -110 dBu or less (IHF-A, Typ.)
    Power Supply: 9V Battery or PSA-Series AC Adaptor
    Current Draw: 20mA (DC 9V)

Overdrive Effect

Ibanez Tube Screamer TS-9

Boss Super Overdrive SD-1

Marshall Pedals: Blues Breaker, Drive Master & Shred Master

Marshall Blues Breaker

Marshall Drive Master

Marshall Shred Master

Fender Blackface Preamp

Parts List : 

P1,P2                          220K  Linear Potentiometers (or 250K)
P3                               10K  Linear Potentiometer
P4                               1M  Log. Potentiometer
R1                               1M  1/4W Resistor
R2,R3                         68K  1/4W Resistors
R4,R5,R6,R7,R8        100K  1/4W Resistors
C1,C7                         47µF  25V Electrolytic Capacitors
C2                               220pF  63V Ceramic or Polystyrene Capacitor (or 250pF)
C3                               100nF  63V Polyester Capacitor
C4                               47nF  63V Polyester Capacitor
C5                               100µF  35-50V Electrolytic Capacitor
C6                               120pF  63V Ceramic or Polystyrene Capacitor
C8                               47nF  63V Polyester Capacitor
Q1,Q2,Q3,Q4             2N3819  General-purpose N-Channel FETs
J1,J2                            6.3mm  Mono Jack sockets
SW1                            SPST Toggle or Slide Switch

Hampton Moving Coil Preamplifier

 Components List  :

R1-5= 100ohm 1% 1/4W R2-6= 150ohm 1% 1/4W R3-7= 33ohm 1% 1/4W R4-8= 12ohm 1% 1/4W

R9...12= 47Kohm 2W R13-14=1Mohm 1% 1/4W C1-2= 1uF 250V MKT V1-2= ECC88 - 6DJ8

S1-2= DIL Switch J1...4= RCA Jack

Application 

Some of the services today preamps using vacuum tubes still in their ability to deliver high-quality audio and unique colors when used with amplifiers. The vacuum tube preamplifier used in the musical instrument amplifier with tone control circuits In this connection it is of the coil wire applications, the ability to obtain high-quality signals and Equalization

Conventional MC-MM Pre Amplifier

The circuit is (more or less) conventional, with a common emitter stage constant current source modulation. When the series is a mirror that is reproduced for both positive and negative supply voltage. Net output voltage again a low DC offset, but may be slightly higher than previous models, because of the lack of power to 0V DC bias to obtain a correct output.

Benefit from a 2.2k resistor from the collector of the output device (parallel, 1.1k) and a 15 ohm resistor (MC or moving coil position) optionally controlled in series with a 150 ohm (MM Moving Magnet or position).

This results in a theoretical advantage 74 (37dB) in the MC position or 7.6 (17.6 dB) for the MM setting. In practice, one can expect very little profit to be less than these figures, especially for MC setting.

I can not comment on the relative noise performance of both pre-amp, but because they are both on a design by renowned audio designer, I would hope that the noise either be a problem with the circuit.

Marshall JCM900 Preamp Schematic

I did not include technical data for this preamp, it's just a scheme to guide repair. May be useful for those who have a Marshall JCM900 guitar preamp .

10w 6L6 Push Pull Amplifier

Schematic

Frequency Response :
15-65Kc (-3dB), 1Kc input, at 3W RMS output across 16 ohms.

Power :
10W RMS for 700mV RMS input, with a THD+Noise of 0.29%

Tube Complement :
1x 6J5 (input), 1x 6SN7 (differential phase inverter), 2x 6L6GC (output), 1x 5R4GYB (rectifier)

The Output Transformer :
The Hammond 1650K is a 7 lb. oversized monster for our current and wattage demands, but it has a 3.4k primary.

High Quality Vacuum Tube Headphone Amplifier

Theres no transformer in output, it only need coupling capacitor in the signal path is the output cap. A relay circuit was used to provide muting and a time delay was used to keep the output muted during warm-up in order to protect the headphones from the high voltages that would otherwise be present at the output of the amplifier.

A separate chassis was used for the power supply to keep noise levels as low as possible. Selection of input tubes (6SN7s) for low noise is important in order to realize the full capability of this circuit. Since I already have a regulated source of 12 volts DC, I intend to modify this amplifier in the future to use 12SX7s.

The power supply is a fairly conventional design using a 6550a as a series pass regulator and a zener string to set the operating voltage.

The amplifier circuit is a 6SN7 run in grounded cathode mode and is self-biased using an un-bypassed cathode resistor. The input stage is direct coupled to a 6CA7 that is used as a cathode follower. The output from the 6CA7 is coupled to the headphones using a 47uF capacitor, providing extended bass response. The output capacitors are bypassed with 1uf and .01uF polystyrene capacitors. An Alps 'Black Beauty' volume control is used to help preserver sonics and easily allows adjustment at low gain levels with adequate tracking between the two channels.

A switchable cross-feed circuit is present at the input of the amplifier to be used to help correct imaging problems, if desired.

source : kevin.kevino.org

Schematic of Hadphone Amplifier

Power Supply of Headphone Amplifier

Class A Single end 2SK1058 Amplifier

Sure there has to be single active component in an amp in order to get the gain to be called an AMPLIFIER. That's a simple amplifier as a single end tube amplifier. A single end vacuum tube Amp need a resistor or two and an output transformer. So I design a FET amp around the same simplicity of design. One audio grade MOSFET, a couple of resistors and capacitors and a heavy duty well filtered power supply. The schematic for the amplifier section is shown in Figure 1.

The amplifier is built around the Hitachi 2SK1058 N-Channel MOSFET. A schematic and pin diagram for the 2SK1058 is shown in Figure 2. I used Sprague capacitors for the input coupling and a large electrolytic on the output with a 10µF polyester bypass capacitor. The four 10W non-inductive wire wound resistors act as the load. The four resistors are 15ohm and 10W each which I wired two in series for 30 ohms and then the two sets of 30 ohms are wired in parallel to give a total resistance of 15 ohms. These get extremely hot and burn about 30W at idle. Yes, Class-A amplification is very inefficient. I burn over 20 Watts to get only about 4.8 audio Watts per channel! The heatsink I used is rated at 0.784 °C/W.

2SK1058 Pin Out

Schematic 2SK1058 Amplifier

Power Supply of  2SK1058 Amplifier

Stereo 2SK1058 Amplifier Module

300B Single End Vacuum Tube Amplifier

Current (new) production 300B tubes like the Electro-Harmonix 300B and the JJ 300B sound wonderful at a fraction of the Western Electric 300B price. A direct coupled driver stage and a low mu triode array are the specific reasons why this design works so well. Good output transformers are the key to good performance. Magnequest FS-030 or XE-60S are good choices.

The schematic for the 300B Single-Ended Vacuum Tube Amplifier is shown below. Using audio output transformers with a primary impedance of about 3000 to 3500 ohms you can expect about 8W of output with at about 2.5% THD. 

Single End Tube Power Amplifier

• This a simple Tube Amplifier with singgle end Tube.
• The power supply use 4xIN4007 Silicon Diode.
• The filament supply is regulated at 6.3V using a LT1085 voltage regulator.

The schematic taken from the book "Build your own Audio Valve Amplifiers" by Rainer zur Linde. 

Harmon Kardon Tone Control Circuit

Tube : 12AU7/12AX7

Frequency Response :

The vertical scale is linear in dB from minus 9 to plus 18 with marks every 3 dB. 

Frequency is from 10 cycles to 100 kc on a log scale. 

There are 5 curves making the shape of an hourglass turned on its side. 

• The top curve starts at 10 cycles and plus 15 dB. At 50 cycles it is at 13 dB and falls until it reaches a minimum at 850 cycles and 1.5 dB. It rises again reaching 8 dB at 10 kc and topping out at 9 dB at 25 kc. It falls to 7.5 dB at 100 kc. 
• The second curve starts out at 10 cycles and 6.5 dB, 50 cycles, 5 dB, 100, 3 dB, 200 cycles, 1 dB 400 cycles 0 dB. At 1 kc it is at 1 dB, at 2 kc, 2 dB and 10 kc 2.5 dB. Past 20 kc it starts to decline and is at 0 dB at 100 kc. 
• The third curve is a straight line at just a scoash over 0 dB. 
• The fourth curve starts at minus 4.5 dB at 10 cycles. It is minus 4 at 50 cycles, and has risen to 0 dB at 300 cycles. It rises about half a dB above zero and crosses zero again at 1 kc. It is at minus 1.5 dB at 10 kc and minus 2 dB at 100 kc. 
• The fifth curve starts at minus 8.5 dB at 10 cycles and is at minus 8 dB at 50 cycles. It is at minus 3 dB at about 250 cycles and rises to a maximum of minus 0.5 dB at 850 cycles. It falls to minus 3.5 dB at 10 kc and minus 4 dB at 100 kc. End verbal description.

YAMAHA P-2200 POWER-AMP SCHEMATIC

Octave Equalizer

This Equalizer will satisfy your wishes about your sound appetizing, you can plug in your audio device or can be used as a guitar tone control. 

If you don't want your audio device looks much potensiometer control, you can change the potensiometers with trimpot and it' will hided in the equalizer box.

Schematic of Octave Equalizer

Solder side of Octave Equalizer PCB

Component Side of Octave Equalizer PCB

 Parts List :

Resistor:
R1 = 68 KOhm
R2,R6,R11,R15,R16,R17,R18,1R19,R20,R21,R22 = 1 KOhm
R3 = 6,8 KOhm
 R4,R7,R8,R9,R12,R13 =3,9 KOhm
R5,R1O = 12 KOhm
R14 = 220 KOhm
R23,R24,R25,R26,R27,R28,R29,R3O = 82 KOhm
P1...P8 = Potensiometer 10 KOhm linier

Capasitor:
C1 = 820 nF
C2,C5,C6,C9,C36 = 820 pF
C3,C7 =   100 uF/4 V
C4,C8,C24,C30 = 4,7 nF
C10 = 470 nF
C11 = 1uF
C12,C15 =  270 nF
C13,C16,C2O = 47 nF
C14,C23 =  15 nF
C17 =   12 nF
C18,C21 = 3,3 nF
C19 = 33 nF
C22 = 560 pF
C25,C34 = 1 nF
C26 = 39 pF
C27 =  560 nF
C28 =  82 nF
C29 = 27 nF
C31 = 120  nF
C32,C35 = 39 nF
C33 = 6,8 nF
C37 = 1,5 nF
C38,C41 = 470 pF  
C39 = 10 nF
C40 = 3,9 nF
C42 =  15 pF
C43,C44,C45,C46,C47,C48 = IO0 nF MKM
C49,C50 = 10 uF/25 V

Semikonduktors:
T1,T2,T5 = BC 549C/BC 550C
T3,T4,T6,T7 = BC 559C/BC 560C
IC1,IC2 = TL 084

Super Headphone Amplifier

Output Illustration

Spec. of Super Headphone Amp.

Output (in Class A) :
160mW at 8  Ohm
600mW at 30 Ohm
120mW at 600 Ohm

Distortion :
Less Than 0.01% at Normal Outout

Schematic

PCB1

PCB2

Parts List :

Reslstor :
R1,R1',R4,R5,R18,R18' = 1 k
R2.R2',R9,R9',R17,R17' = 22 k
R3,R6 = 27 k
R7,R7' = 220 k
R8,R8',R19,R19' =2k2
R10,R10',R13,R13' = 4k7
R14,R14',R20,R20' = 330 Ohm
R15,R15' = 3k3
R16,R16' = 1k5
R21,R21',R23,R23' = 820 Ohm
R22,R22',R24,R24' = 1 Ohm/1 W Carbon
P1,P2 = 50 k(47 k) Trimpot
P3,P3' = 2k5 (2k2] Trimpot
PAPA' = 10 k Trimpot

Capasitor :
C1,C1',C6,C6' = 22 p/10 V
C2,C3 = 47 uF/4 V
C4,C4' = 220 uF/4 V
C5,C5' = 33 p
C7,C7',C8,C8’ = 100 n

Semi Conductor :
T1...T5,T3',T4',T5'.T10,T11,T11',T12,T12' = BC 550C
T6...T9,T6'...T9',T14,T14' = BC 560C
T13,T13' = BD 139
T15,T15' = BD 140

Other Parts :
F1,F1' =  500 mA Fuse with socket
headsink for T13,T13',T15,T15'

High Quality Preamp with Tone Control

Spesification :

• Sensitivity input to output 500 mVef / with load resistor 10 kOhm:

          MD: 2,6 mVef/50 KOhm (@ 1 kHz)
          Tuner 130 mVef/50KOhm
          Tape Player: 130 mVef/50KOhm

• Output Impedance

          1,2 KQ

• Balance Control

         (at 10 KOhm Load) : +3,3 dB
         (Loadless) : +2,3 dB

• Tone Control

         +/- 10 dB at 50 Hz (Low)
         +\- 10 dB pada 10 kHz (High)

• Sinyal/Noise (thd 500 mV€f):

          MD: 65 dB
          Tuner/Tape : 75 dB

• MD Max Input Voltage  at 1 kHz : 200 mvef

          (reflection characteristics of the RIAA)

Schematic

Pcb1

  

Pcb2

Parts  List :

Resistor :
R1,R1',R2,R2',R8,R8',R10,R10' = 10 KOhm
R3,R3' = 270 Ohm
R4,R4' = 560 Ohm
R5,R5' = 10 KOhm
R6,R6' = 120 KOhm
R7,R7' = 220 KOhm
R9,R9' = 22 KOhm
R11,R11'.R12,R12' = 82 KOhm
R13,R13',R14,R14',R17,R17' = 2,2 KOhm
R15,R15',R16,R16' = 47 KOhm
R18,R18',R19,R19' = 100 Ohm
P1/P1' = 100 KOhm log. stereo
P2/P2',P4/P4' = 10 KOhm lin. stereo
P3/P3' = 4,7 KOhm(5KOhm)  lin. stereo

Capasitor :
C1,C1’ = 120 nF
C2,C2' = 47 uF/6,3 V Tantalum
C3,C3',C4,C4',C10,C10',C11,C11' = 15 nF
C5,C5' = 27 nF
C6,C6',C7,C7',C8,C8',C9,C9',C12,C12',C13,C13',C22,C22',C23,C23' = 10 uF/35 V tantalum
C14,C15 = 220 uF/25 V
C16,C17 = 330 nF
C18,C19,C20,C20',C21,C21',C24,C24',C25,C25' = 100 nF
C26,C26' = 22 pF
C27,C28 = 1 uF/35 V tantalum

Semi conductor :
IC1,IC1' = TDA 1034BN, NE 5534N (Philips/Signetics)
C2,IC;',IC;,IC;' = TDA 1054B, NE 5534 (Philips/Signetics)
IC4 = MC 78L15CP (10%) or MC 78L15A CP
           (5%) (Motorola)
IC5 = MC 79L15CP (10%) or MC 79L15A CP
           (5%) (Motorola)
B1   = B40C500

Other Parts :
S1/S1',S2/S2' = bipolar Switch
S3 = On/Off Switch
Tr1 = 2 x 15 V 100 mA Transformator
F1 = 100 mA Slow Fuse

Stereo Synthesizer

This routine efforts to cheer up mono audio resources by replicating a music indication. It does this by changing certain wavelengths between left and right to deceive the ear. It can often generate a acceptable concept music audio to bring some level to otherwise flat sessions. Of course, there is no way to generate real music audio from a simply mono source unless the workstation had a way to tell which route the unique audio came from, but an impression is generally enough for all but the dedicated audiophile. 

 Parts List :

R1                       4.7K 1/4W
R2                      10K 1/4W    
R3                      12K 1/4W    
R4, R6                22K 1/4W    
R5                      11.K 1/4W    
R7                      16K 1/4W    
R8                      100K 1/4W   
R9                      24K 1/4W    
R10                    18K 1/4W    
C1                     0.1uF Ceramic Disc    
C2, C3    2        0.47uF Ceramic Disc    
C4, C5, C7       0.01uF Ceramic Disc    
C6                     0.013uF Ceramic Disc   
C8, C9              4.7uF 25V Electrolytic    
C10                  0.22uF Ceramic Disc   
C11                  47uF 25V Electrolytic    
C12                  100uF 25V Electrolytic    
D1                     LED   
IC1                    TBA3810 (442-794)   
S1                    SPDT Switch   
S2                    power  Switch

Simple Audio Mixer

Mixer Parts List :

R1-8-31-32=3.3K ohms        
R2-7-27-30=100 ohms        
R3-4-9-10=1M ohms        
R5-11-21-22-23-24=10K ohms        
R6-12-15-17=1K ohms        
R13-14-19-20-28-29=47Kohms        
R18-16-25-26=22K ohms        
RV1=2X100K ohms Lin.        

C1-4-7-9-12-17=10uF 16V
C2-8=470nF 63V MKT
C3-24-27-28=100nF 63V MKT
C5-10=10pF ceramic
C6-11=1uF 16V
C13-16-20-21=47pF
C22-23-25=100uF 16V
C14-15-18-19=1uF 63V MKT

IC1=TLC274
IC2=TLC272
IC3=7805
D1=1N4007
D2=LED 3mm
JF3-4=RCA female plug
JF7=female jack 3.5mm mono
JF1-2-5-6=female jack 3.5mm stereo

Stereo Chorus

Semiconductor parts :

• IC1,IC2: 6458D or TA75558P (Dual operational amplifier)
• IC3: LA6358 or TA75358P (Dual operational amplifier)
• IC4: MN3207 (1024 stage BBD)
• IC5: MN3102 (BBD driver)
• IC6: D4027BC or TC4027BAP (Dual J-K Master/Slave Flip-Flop)
• Q1-Q3,Q5,Q7-Q9: 2SC1815 or equivalents (NPN silicon transistors)
• Q4,Q6,Q9: 2SK772, 2SK445 or equivalents (N-Channel JFET)
• D1-D6: 1N4148 or equivalents (switching diodes)
• ZD1: 5.1V Zener diode

Bridge 100 W Amplifier

The center of this link operate firm routine is the TDA7294 incorporated routine which is actually a energy functional firm with a pre-amplifier routine, heat range management and outcome brief routine security. Moreover the IC is outfitted with individual reviews Mime (Mute output) and the STBY or Stand-By (Disconnect the energy amplifier). Each IC increases half-cycle indication reviews and provides outcome 50W each.

This 100W link firm routine must be operated with + /-25V and 4A. Where to stereo program devices demanding present should be 8A. Fill (speaker) must be 8 ohms. With these values​​, the routine will provide 100W with a complete frame distortions of less than 0.1% frame distortions or 150W with a complete of about 10%. Because of this reviews to the presenter settings to link the two devices (positive and negative), the adverse terminal should not be relocated to the floor as in other amps. Doing so will cause a brief routine at the outcome of the processor and harm it by initiating safety if not changed soon enough.

For energy can be use traditional transformer or a changing energy, in the latter situation the resource must be of top excellent and strained. But if bodyweight is not a issue we suggest using a excellent old transformer with rectifier and electrolytic and clay capacitors.

TDA7294:
The producer of this IC (SGS-Thompson) should stimulate the mute operate before using Stand-By. This IC produces 1.3 levels Celsius per w of energy. That is why we have to put on an sufficient warm mess up to avoid program get too hot and cause overtemperature shut down.

Although the maker statements that this is a built-in 100v / 100w should be recalled that this requirements is officially and in theory. In exercise, the incorporated routine can provide energy over a 50w 8 ohm load at a present of 50V for beginning which uses about 2 amperes and produces warm.