StewMac 66 D-REVERB Assembly Instructions Manual Download Page 4

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Here’s how to build this amp!

Wiring

goes like this:

First, you’ll

wrap

the leads, connecting them without solder.

Then

double-check

all the connections. Don’t rush!

When everything checks out, it's time to

solder

The numbered steps tell you when.

Get the

cabinet

ready,

starting at

Step

on page

You’ll prep the metal

chassis

and the

eyelet board

too.

Learn more:

You don’t need to read the

schematic

, but it’s fun!

See how your guitar’s signal gets processed into sound

page 59

Sort your components by type, using the

parts list

Quick look:

See page

Ground

Jack

Transformer

Preamp tube

plate

grid

cathode

Power tube

grid

plate

cathode

screen

Capacitor

Electrolytic Cap.

Diode

Resistor

Potentiometers

Rectifier tube

Optoisolater

plate

cathode
filament

plate

Shielded

cable

’66 D-REVERB

22W

ORIGINAL AB763 CIRCUIT

Gain

Processing

Output

Negative Feedback

μF

50V

μF

6.8

+180V

+1.3V 8

+1.3V

+200V
1

+77V

250pF

.01

μF

.047μF

.022μF

.0033μF

.01μF

VIBRATO

PEDAL

REVERB

PEDAL

REVERB UNIT

Output

Input

.1μF

.01μF

μF

.1μF

SOCKET

7025

SOCKET

7025

NORMAL

SOCKET

12AT7

SOCKET

GZ3

SOCKET

12AX7

SOCKET

12AT7

SOCKET

6V6GT

SOCKET

6V6GT

.1μF

500pF

.047μF

100

Ω

100

Ω

220

Ω

100

3.3

220K

22K

1.5K

470Ω

820Ω

470Ω

1.5K

10K

100K

220K

100

470

220

470

Ω

250

TREBLE

1MA

UME

250

ASS

3MRA

SPEED

INTENSI

μF

50V

820

Ω

6.8

+170V 1

+180V 1

3 +1.3V

+170V

+180V

250pF

47pF

.1μF

SOCKET V2

7025

VIBR

.047μF

100

250

TREBLE

100KL

VERB

1MA

UME

250

ASS

EXTENSION

SPEAKER

TR3

TR2

STANDBY

SWITCH

TR4

TR1

TR1: 125P33A

125P23B

TR2: 125C3A

TR3: 125A1A

TR4: 125A20B

3 +1.2V

+170V

+410V

+8.7V

+370V

+415V

-35V

+41

2.2

330VAC

AC switch

1 amp

slow-blow fuse

To tube heaters

and pilot light

330VAC

820

Ω

μF

50V

μF

450V

μF

450V

μF

50V

μF

50V

100A

.02

μF

16μF
450V

10KL

+365V

+415V

Output

Gain

Processing

Summary of Contents for 66 D-REVERB

Page 1: ...ASSEMBLY INSTRUCTIONS With loads of helpful tips Famously clean with enough guts to gig 66 D REVERB 22W CO MB O AMP KIT ORIGINAL AB763 CIRCUIT ...

Page 2: ...talling parts and preparing for testing 52 Testing and troubleshooting 53 Final assembly 56 Tips for using the 66D 57 Learning more secrets revealed in the schematic 58 Circuit schematic 59 More iconic amp kits from StewMac 60 Complete wiring diagram 62 Tube replacement chart 63 COPYRIGHT WARNING This material is protected by copyright and has been created by and solely for the purposes of StewMac...

Page 3: ...tortion It s all here clarity distortion and rectifier tube sag StewMac ICON KITS bring classics that are no longer made or are simply unaffordable within reach And the best part is you get to build them with your own hands We give painstaking attention to parts selection authentic materials and instantly recognizable details everything that makes the originals so sought after Build it with StewMa...

Page 4: ... 3V 8 8 1 3V 200V 1 77V 250pF 10 pF 1 pF 01 μF 047μF 022μF 0033μF 01μF A E C B C VIBRATO PEDAL REVERB PEDAL REVERB UNIT Output Input 1μF 01μF 1μF 1μF SOCKET V1 7025 SOCKET V4 7025 NORMAL SOCKET V3 12AT7 SOCKET V9 GZ34 SOCKET V5 12AX7 SOCKET V6 12AT7 SOCKET V7 6V6GT SOCKET V8 6V6GT 1μF 500pF 047μF 1 100 K 100 K 100 K 100 Ω 100 Ω 82 K 220 K 220 K 220 K 47 Ω 1 M 1 M 100 K 3 3 M 220K 22K 1 5K 470Ω 820...

Page 5: ... Orange Gold Brown Black Yellow Gold Brown Black Orange Gold Red Red Yellow Gold Yellow Violet Yellow Gold Brown Black Green Gold Yellow Violet Brown Gold Brown Black Blue Gold Brown Black Orange Gold Capacitors r 1 47pF 500V silver mica r 2 250pF 500V silver mica r 1 500pF 500V silver mica r 1 10pF 500V ceramic disk r 2 01μF 500V ceramic disk r 1 02μF 500V ceramic disk r 1 001μF 600V Orange Drop ...

Page 6: ...0KL bias pot r 1 100KL control pot r 4 250KA control pot r 2 1MA control pot r 1 3MRA control pot r 1 50KRA control pot r 9 Knob r 2 Three lug grounding strip r 2 Power switch 2 lugs r 1 Ground switch 3 lugs r 1 Power cord r 1 Speaker plug Transformers r 1 Power transformer r 1 Output transformer r 1 Reverb driver r 1 Filter choke Reverb r 1 Reverb tank r 1 Reverb tank bag r 1 Reverb wiring kit r ...

Page 7: ... 5 32 5 64 and 1 4 bit For mounting eyelet board and filter cap Ruler Item 4905 StewMac Shop Rule Digital multimeter Item 3618 Fieldpiece Pocket Multimeter Snuffer stick bleed resistor Item 1552 Snuffer Stick Pencil Wooden chopsticks Glue Wood glue white glue or contact cement for gluing a paper label inside the cabinet Butane lighter or matches For heating heat shrink tubing Helpful Round nose be...

Page 8: ... to call 911 can be a lifesaver How to use a snuffer stick To discharge a capacitor clip the snuffer stick lead to ground preferably a mounting bolt on the power transformer Hold the tip of the stick to the cap s positive lead and use your multimeter to watch the voltage drain to less than 18V Take breaks and stop when you re tired Fatigue leads to mistakes and no one can afford mistakes when work...

Page 9: ... too large for use in an amplifier Caps for amps are rated in millionths of a farad called microfarads μF or trillionths of a farad picofarads pF The voltage spec for a cap refers to how much DC voltage it can handle at any given time A unique property of capacitors is that they don t allow DC current to flow past them only AC current This is important in parts of an amplifier circuit such as the ...

Page 10: ... pilot hole to mount the power cord clamp Locate the clamp insidetheleftwall of the cabinet 1 from the back panel ledge 8 from the bottom Don t drill through the cabinet Use a piece of masking tape on your drill bit to mark the depth or use a StewMac Depth stop Drill Bit item 1712 Use the black wood screw to mount the power cord clamp You ll secure the power cord with this clamp later after the te...

Page 11: ...nto the outside of the plug Solder the four RCA plugs this way on each end of the two cables These two cables will connect the reverb tank Test for continuity between the tips of the plugs on each cable then test for continuity between the shields of the plugs in the same way Also test to make sure you don t have continuity between the tip and the shield of each plug which would indicate a short i...

Page 12: ...4 holes in the two upper cor ners of the taped together filter cap board and insulator holes G and M Drill a third 1 4 hole centered be tween eyelets P and R hole Q Separate the boards and set the insu lator board aside Thereddotsontheseboardsindicate holes you ll drill in the next steps The main board and bias board each get two small mounting holes that don t need to be numbered The filter cap b...

Page 13: ...d So wrap the leads tightly for good electrical contact before soldering n Melt a small amount of solder onto the tip of the iron tinning the iron Hold the tip against the joint for a few seconds untiltheconnectionreaches soldering temperature Also tin component leads like multi strand wires to help the solder flow Tips for great soldering n Keep your soldering tip clean by wiping it often on a da...

Page 14: ...V3 12AT7 V4 12AX7 V5 12AX7 V6 12AT7 V7 6V6 V8 6V6 V9 5AR4 OUTPUT TRANSFORMER Mounted outside POWER TRANSFORMER FILTER CHOKE Mounted outside R E V E R B D R I V E R M o u n t e d o u t s i d e 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 2 5 0 K A 1 M A Solder Wrap Snip 3 lugs electrically...

Page 15: ...rews and locknuts to mount the filter choke outside of the chassis STEP 18 Install the speaker output jack Add the three lug speaker output jack next to the two lug extension speaker jack which you ve already installed These jacks are electrically grounded through contact with the metal chassis so tighten them well for a good ground STEP 19 Install the three large tube sockets with tension clips O...

Page 16: ...AL EXT SPKR SPEAKER STANDBY POWER FUSE GROUND V1 12AX7 V2 12AX7 V3 12AT7 V4 12AX7 V5 12AX7 V6 12AT7 V7 6V6 V8 6V6 V9 5AR4 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 6 5 4 3 2 1 8 7 6 5 1 M A 1 M A 2 5 0 K A 2 5 0 K A 1 0 0 K L 3 M R A 5 0 K R A 2 5 0 K A 2 5 0 K A 47 ...

Page 17: ... through the left lug of the normal channel bass pot and solder the lead to this lug Solder the 6 8K resistor s other lead to the back of the normal channel bass pot STEP 29 Install two jumpers Cut two 2 yellow jumpers Wrap one end of the first jumper through the middle lug of the vibrato channel bass pot and wrap the other end of this jumper through the left lug of the vibrato channel treble pot ...

Page 18: ...B OUTPUT REVERB PEDAL VIBRATO PEDAL EXT SPKR SPEAKER STANDBY POWER FUSE GROUND V1 12AX7 V2 12AX7 V3 12AT7 V4 12AX7 V5 12AX7 V6 12AT7 V7 6V6 V8 6V6 V9 5AR4 POWER TRANSFORMER 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 6 5 4 3 2 1 8 7 6 5 ...

Page 19: ...ap the remaining resistor lead onto the left lug of jack 1 adding it to the connection made in the previous step Solder all these connections and also solder the twisted 68K resistor leads STEP 35 Power transformer black leads Run either of the black wires from the power transformer to the side lug of the fuse socket Trim it to fit and solder it Trim and solder the other black wire to the left lug...

Page 20: ...B OUTPUT REVERB PEDAL VIBRATO PEDAL EXT SPKR SPEAKER STANDBY POWER FUSE GROUND V1 12AX7 V2 12AX7 V3 12AT7 V4 12AX7 V5 12AX7 V6 12AT7 V7 6V6 V8 6V6 V9 5AR4 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 6 4 3 2 1 9 8 7 5 4 3 2 1 8 7 6 5 V3 12AT7 6 4 3 2 1 9 8 7 5 ...

Page 21: ...driver leads Trim the green lead to reach the middle lug of the reverb input jack tin it and solder it to the lug Trim the black lead to reach the ground tab on the reverb input jack Tin it and solder it to this tab Trim the blue lead to reach pin 6 of socket V3 Tin it and wrap it onto the pin but don t solder it yet Leave the red lead free for now you will install it to the eyelet board later on ...

Page 22: ...RB INPUT REVERB OUTPUT REVERB PEDAL VIBRATO PEDAL EXT SPKR SPEAKER STANDBY POWER FUSE GROUND V1 12AX7 V2 12AX7 V3 12AT7 V4 12AX7 V5 12AX7 V6 12AT7 V7 6V6 V8 6V6 V9 5AR4 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 4 3 2 1 8 7 6 5 6 4 3 2 1 9 8 7 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 ...

Page 23: ...et V7 Stand this resistor up off the socket about half an inch Solder the lead wrapped in pin 4 Add one 470Ω 1W resistor between pin 4 and pin 6 of socket V8 Stand this resistor up off the socket about half an inch Solder the lead wrapped in pin 4 STEP 48 Add three jumpers Cut one 3 1 2 yellow jumper Solder one end to pin 6 of socket V8 Wrap one end onto pin 6 of socket V7 but do not solder it yet...

Page 24: ...ding their leads tightly so the parts stay in place without solder Inspect When all the parts are in place stop and inspect Go back over every step Careful inspection is the best way to make sure your amp works the first time you turn it on Solder Solder each connection point only once Reheating to add another part makes a messy faulty solder joint Use the soldering tips on page 11 to get professi...

Page 25: ...of the capacitor Connect the cap s negative lead to eyelet F Add the rectifier diode between eyelets B and C Note the polarity The positive lead of the diode is indicated by a stripe at that end The end with no stripe is negative Connect the negative lead to eyelet C STEP 51 Add two jumpers Cut a 1 1 8 yellow jumper Flip the bias board over and add this jumper between eyelets C and F on the back o...

Page 26: ...stewmac com 24 2019 StewMac G N H O I P J R K S L M Q 16μF 16μF 16μF 16μF 16μF ...

Page 27: ...TEP 55 Add two resistors Add a 10K 2W resistor between eyelets H and I Add another 10K 2W resistor between eyelets I and J STEP 56 Add four jumpers Cut two 6 green jumpers Wrap one end of one through eyelet S Pull the other end through hole M and pull it tight to keep it in place Wrap one end of the other jumper through eyelet N Pull the other end through hole G and pull it tight to keep it in pla...

Page 28: ... 92 94 97 96 95 58 43 49 50 32 31 93 61 44 35 60 98 63 62 45 36 11 37 55 41 12 14 15 88 56 89 42 16 19 21 23 26 99 76 77 78 81 82 79 80 29 46 64 39 47 48 30 65 66 67 53 33 9 84 69 70 71 72 59 57 73 74 40 13 20 22 27 18 17 25 24 75 104J 600V 104J 600V 473J 600V 250 473J 600V 25µ F 25µ F ...

Page 29: ...een eyelets 62 and 98 Add another 100K resistor between eyelets 62 and 97 STEP 63 Install a 047μF cap Add a 047μF Orange Drop cap between eyelets 23 and 97 STEP 64 Add two jumpers Cut a 2 jumper and add it to eyelet 97 Cut a 2 3 4 jumper and add it to eyelet 98 Cut a 10 1 2 yellow jumper Turn the board over and wrap this jumper through the bottom of eyelet 23 Run the other end of this jumper up th...

Page 30: ... 94 97 96 95 58 43 49 50 32 31 93 61 44 35 60 98 63 62 45 36 11 37 55 41 12 14 15 88 56 89 42 16 19 21 23 26 99 76 77 78 81 82 79 80 29 46 64 39 47 48 30 65 66 67 53 33 9 84 69 70 71 72 59 57 73 74 40 13 20 22 27 18 17 25 24 75 473J 600V 250 223J 600V 33 2J 60 0V 25 µF 510 25µ F 104J 600V ...

Page 31: ...Install a 500pF cap 1M resistor Add a 500pF silver mica cap between eyelets 43 and 58 Add a 1M resistor between eyelets 16 and 43 STEP 76 Install a 25μF cap an 820Ω resistor soldered together Wrap the leads from the 820Ω resistor around the leads on the 25μF 50V capacitor and solder them together Note the polarity of the capacitor Install this resistor capacitor assembly between eyelets 16 and 91 ...

Page 32: ...86 87 90 91 92 94 97 96 95 58 43 49 50 32 31 93 61 44 35 60 98 63 62 45 36 11 37 55 41 12 14 15 88 56 89 42 16 19 21 23 26 99 76 77 78 81 82 79 80 29 46 64 39 47 48 30 65 66 67 53 33 9 84 69 70 71 72 59 57 73 74 40 13 20 22 27 18 17 25 24 75 1 0 p F 25 µF 25µ F 01μF 01μF 02μF ...

Page 33: ...e lead goes to eyelet 12 STEP 87 Add four jumpers Cut a 3 1 2 yellow jumper Turn the board over and wrap this jumper through the bottom of eyelet 41 Run the other end of this jumper up through hole 70 and pull it tight so it stays in place Cut a 9 1 2 yellow jumper Turn the board over and wrap this jumper through the bottom of eyelet 14 Run the other end of this jumper up through hole 13 and pull ...

Page 34: ...90 91 92 94 97 96 95 58 43 49 50 32 31 93 61 44 35 60 98 63 62 45 36 11 37 55 41 12 14 15 88 56 89 42 16 19 21 23 26 99 81 82 79 80 67 53 33 9 84 69 70 71 72 59 57 73 74 40 13 20 22 27 18 17 25 24 38 28 1 2 3 4 5 76 77 78 29 46 64 39 47 48 30 65 66 75 25µF 102J 1119 ...

Page 35: ...ED flashes and the intensity control determines how much of the guitar signal is affected by the light dependent resistor STEP 94 Add three jumpers Cut a 10 yellow jumper Turn the board over and wrap this jumper through the bottom of eyelet 8 Run the other end of this jumper up through hole 9 and pull it tight so it stays in place Cut a 3 1 4 yellow jumper Turn the board over and wrap this jumper ...

Page 36: ...5 86 87 90 91 92 94 97 96 95 58 43 49 50 32 31 93 61 44 35 60 98 63 62 45 36 11 37 55 41 12 14 15 88 56 89 42 16 19 21 23 26 99 76 77 78 81 82 79 80 29 46 64 39 47 48 30 65 66 67 53 33 9 84 69 70 71 72 59 57 73 74 40 13 20 22 27 18 17 25 24 75 104J 600V 104J 600V 104J 600V ...

Page 37: ...eyelet 4 Run the other end of this jumper up through hole 65 and pull it tight so it stays in place Cut a 7 yellow jumper Turn the board over and wrap this jumper through the bottom of eyelet 3 Run the other end of this jumper up through hole 65 and pull it tight so it stays in place STEP 104 Add three jumpers Cut a 3 3 4 yellow jumper Turn the board over and wrap this jumper through the bottom of...

Page 38: ...0 34 54 68 83 85 86 87 90 91 92 94 97 96 95 58 43 49 50 32 31 93 61 44 35 60 98 63 62 45 36 11 37 55 41 12 14 15 88 56 89 42 16 19 21 23 26 99 76 77 78 81 82 79 80 29 46 64 39 47 48 30 65 66 67 53 33 9 84 69 70 71 72 59 57 73 74 40 13 20 22 27 18 17 25 24 75 ...

Page 39: ...let 35 Wrap the other end of this jumper through the bottom of eyelet 62 Cut a 3 1 4 yellow jumper Turn the board over and wrap this jumper through the bottom of eyelet 35 Wrap the other end of this jumper through the bottom of eyelet 56 Cut a 2 1 4 yellow jumper Turn the board over and wrap this jumper through the bottom of eyelet 15 Wrap the other end of this jumper through the bottom of eyelet ...

Page 40: ...2 1 9 8 7 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 Insulator Board Insulator Board 38 28 1 2 3 4 5 6 7 8 51 52 10 34 54 68 83 85 86 87 90 91 92 94 97 96 95 58 43 49 50 32 31 93 61 44 35 60 98 63 62 45 36 11 37 55 41 12 14 15 88 56 89 42 16 19 21 23 26 99 76 77 78 81 82 79 80 29 46 64 39 47 48 30 65 66 67 53 33 9 84 69 70 71 72 59 57 73 74 40 13 20 22 27 18 17 25 24 75 A B C D F E 104J 600...

Page 41: ...ere it will be mounted and adjust these jumpers until they reach their components To install the main eyelet board first lay the main insulation board on the bottom of the chassis aligning it with the mounting holes Run a 6 32 x 1 2 machine screw through the eyelet board the insulation board and through the chassis Secure it with a locknut on the outside of the chassis Do the same with the second ...

Page 42: ... V9 5AR4 A B C D F E 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 2 5 0 K A 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 2 5 0 K A 38 28 1 2 3 4 5 6 7 8 51 52 10 34 54 68 83 85 86 87 90 91 92 94 97 96 95 58 43 49 50 32 31 93 61 44 35 60 98 63 62 45 36 11 37 55 41 12 14 15 88 56 89 42 16 19 21 23 26 99 76 77 78 81 82 79 80 29 46 64 3...

Page 43: ...lder tube socket V9 Wrap one of the 7 3 4 yellow jumpers from hole 28 to pin 8 on tube socket V9 along with the yellow power transformer lead Solder all connections to this socket five wires and trim the excess wire ends STEP 118 Solder tube socket V8 Test the two jumpers coming from hole 65 to identify the one with continuity to eyelet 3 Wrap this jumper to pin 1 of tube socket V8 Solder all conn...

Page 44: ...6V6 V8 6V6 V9 5AR4 A B C D F E 6 4 3 2 1 9 8 7 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 38 28 1 2 3 4 5 6 7 8 51 52 10 34 54 68 83 85 86 87 90 91 92 94 97 96 95 58 43 49 50 32 31 93 61 44 35 60 98 63 62 45 36 11 37 55 41 12 14 15 88 56 89 42 16 19 21 23 26 99 76 77 78 81 82 79 80 29 46 64 39 47 48 30...

Page 45: ...e V2 tube socket Wrap the marked jumper from hole 73 to pin 2 of the V2 tube socket Wrap the jumper from eyelet 91 to pin 8 of the V2 tube socket with the jumper already in place Wrap the jumper from eyelet 95 to pin 3 of the V2 tube socket Solder the connections to this socket six wires and trim the excess wire ends STEP 125 Solder tube socket V1 Wrap the jumper from eyelet 97 to pin 6 of the V1 ...

Page 46: ...6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 1 M A 1 M A 2 5 0 K A 2 5 0 K A 1 0 0 K L 2 5 0 K A 2 5 0 K L 38 28 1 2 3 4 5 6 7 8 51 52 10 34 54 68 83 85 86 87 90 91 92 94 97 96 95 58 43 49 50 32 31 93 61 44 35 60 98 63 62 45 36 11 37 55 41 12 14 15 88 56 89 42 16 19 21 23 26 99 76 77 78 8...

Page 47: ...he excess wires STEP 132 Solder vibrato channel volume pot Solder the unmarked jumper coming through hole 20 to the middle lug of the vibrato channel volume pot along with the capacitor lead already in place Cut a 1 green jumper and remove the insulation Bend this jumper in a J shape and run it from the left lug of the volume pot to the back of the vibrato channel volume pot Solder it in both plac...

Page 48: ...6 V9 5AR4 A B C D F E 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 3 M R A 5 0 K R A 38 28 1 2 3 4 5 6 7 8 51 52 10 34 54 68 83 85 86 87 90 91 92 94 97 96 95 58 43 49 50 32 31 93 61 44 35 60 98 63 62 45 36 11 37 55 41 12 14 15 88 56 89 42 16 19 21 23 26 99 76 77 78 81 82 79 80 29 46 64 39...

Page 49: ...om eyelet E of the bias board to the nearby three lug grounding strip Solder the red blue lead from the power transformer to eyelet A of the bias board Solder the jumper from hole D to the right lug of the bias pot Find the jumper coming through hole 9 that has continuity to eyelet 10 Solder this jumper to eyelet C of the bias board STEP 140 Solder bias pot jumpers Solder the jumper from hole D to...

Page 50: ...D F E 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 4 3 2 1 8 7 6 5 38 28 1 2 3 4 5 6 7 8 51 52 10 34 54 68 83 85 86 87 90 91 92 94 97 96 95 58 43 49 50 32 31 93 61 44 35 60 98 63 62 45 36 11 37 55 41 12 14 15 88 56 89 42 16 19 21 23 26 99 76 77 78 81 82 79 80 29 46 64 39 47 48 30 65 66 67 53 33 9 84 69 7...

Page 51: ...n 2 and the black wire is soldered in to socket V8 pin 7 make sure you connect the white wire to socket V7 pin 2 and the black wire to socket V7 pin 7 STEP 146 Connect to tube socket V6 On sockets V6 through V1 you will need to join pins 4 and 5 together On these six sockets gently twist pins 4 and pin 5 toward each other so their eyelets line up Be very careful while doing this as these pins are ...

Page 52: ...6V6 V8 6V6 V9 5AR4 A B C D F E 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 38 28 1 2 3 4 5 6 7 8 51 52 10 34 54 68 83 85 86 87 90 91 92 94 97 96 95 58 43 49 50 32 31 93 61 44 35 60 98 63 62 45 36 11 37 55 41 12 14 15 88 56 89 42 16 19 21 23 26 99 76 77 78 81 82 79 80 29 46 64 39 47 48 30...

Page 53: ...be sockets as far as you can STEP 152 Add the power cord strain relief Strip the power cord s outer insulation back until the black and white leads can reach from the access hole to the power switch and fuse Twist the black and white leads together Cut the green lead from the power cord to reach the three lug grounding strip just inside the chassis underneath the hole for the power cord Tin this g...

Page 54: ...P IN YET The next page is going to keep you out of trouble STEP 158 Set the chassis on a chassis stand or on blocks for testing Set your chassis up for final testing Chassis stands are extremely useful for this If you do not have a chassis stand a couple of blocks of wood can work just fine STEP 156 Install the pilot lamp Insert the pilot lamp bulb into its socket from the front of the chassis and...

Page 55: ...eingtested andtheblackleadtothe other end If the continuity is good your meter will beep or register this on the display Voltage testing is where you need to be careful Some steps require the amp to be plugged in and turned on This becomes dangerous if you re not cautious Respect the voltages and follow the directions and these tests are safe and easy STEP 159 Perform a safe power up Atthispoint t...

Page 56: ...nplugged install the 6V6 power tubes turning them so their indexing keys fit correctly in the socket Turn all of the front panel con trols completely counter clockwise so the indicator line is pointing to 1 Plugthespeakerinandperformthese next tests with the speaker turned away from you If the amp starts to oscillate and squeal this will help protect your ears Plug the amp in and flip the power sw...

Page 57: ...e 6V6 power tubes in this amp that maximum is 14 watts Exceeding the 14 watt limit will dam age the tube and operating at the full 14 watts will shorten its life Our goal is to operate the tube at 60 of the 14 watt limit or 8 4 watts We ve entered this number for you in Box 1 of the calculation Plate voltage You already have the plate voltage for these tubes it s the thenumberyoufoundinStep163and ...

Page 58: ... ing the cables in the reverb in and out jacks If that doesn t remedy the issue check your reverb cables again for a short If there are any strange oscillations squeals ortheampseemsatallunsta ble use a wooden chopstick to begin probing for loose connections n from the input jacks to the eyelet board n from the tube sockets to the eyelet board n from the tube sockets to the front panel controls It...

Page 59: ...orgive him for that Why is this amp so sweet and how do you dial it in The AB763 tone stack has a distinct mid scoop the bass andtreblecontrolsboosttheirranges while leaving the mids unaffected With bass and treble set to minimum the tone stack bleeds off about 25dB from the signal For this reason try setting the bass and treble at about 6 If you re using single coils maybe bumpthebassupabitmore a...

Page 60: ...he reverb send and the first half of V4 handles the reverb re covery V5 handles the vibrato circuit Both channels are then sent to the phase inverter which uses all of V6 The phase inverter then sends the signal to the output section The power supply stage provides power to the other circuit stages as well as the tube heaters and pilot light ThiscircuitreceivestheACpowerfromyourwallandpassesitthro...

Page 61: ...V6GT 1 μF 500 pF 047 μF 1 100 K 100 K 100 K 100 Ω 100 Ω 82 K 220 K 220 K 220 K 47 Ω 1 M 1 M 100 K 3 3 M 220 K 22 K 1 5 K 470 Ω 820 Ω 470 Ω 470 Ω 1 5 K 10 K 10 K 100 K 220 K 100 K 100 K 100 K 100 K 100 K 470 K 220 K 2 2 M 220 K 10 M 10 K 470 Ω 250 KA TREBLE 1 MA VOLUME 250 KA BASS 3 MRA SPEED 50 KRA INTENSITY 68 K 25 μF 50 V 1 5 K 25 μF 50V 820 Ω 6 8 K 68 K 1 M 1 M 2 2 170 V 1 180 V 1 3 1 3 V 3 1 3...

Page 62: ...ean with enough guts to gig Perfect for recording as well as performing the D Reverb produces stinging clarity that absolutely refuses to get lost in the mix One of the most popular designs ever this amp lives in the happy middle between bright clarity and rich distortion It excels in the studio and on the stage While capable of crystal clear tones at good volume you can push this one into beautif...

Page 63: ...800 50W AMP KIT This hairy monster lives to shred The defining British circuit that dominated the 80s This 50W giant created your favorite heavy rock and metal albums Used by Slayer and Pixies and recorded on early Metallica albums this circuit produces that screaming guitar tone that your mother despises With solid state rectification there s no sag and the distortion created by this circuit is w...

Page 64: ...1 8 7 6 5 2 5 0 K A 1 M A 1 M A 1 M A 2 5 0 K A 2 5 0 K A 1 0 0 K L 3 M R A 5 0 K R A 2 5 0 K A 2 5 0 K A 38 28 1 2 3 4 5 6 7 8 51 52 10 34 54 68 83 85 86 87 90 91 92 94 97 96 95 58 43 49 50 32 31 93 61 44 35 60 98 63 62 45 36 11 37 55 41 12 14 15 88 56 89 42 16 19 21 23 26 99 76 77 78 81 82 79 80 29 46 64 39 47 48 30 65 66 67 53 33 9 84 69 70 71 72 59 57 73 74 40 13 20 22 27 18 17 25 24 75 47 25µ...

Page 65: ... 6V6 V9 V8 10737 66 D Reverb 22W ORIGINAL AB763 CIRCU IT StewMac I C O N K I T S Use only 1 amp slow blow fuse size 5mm x 20mm DANGER Unplug the amp before changing tubes Tube locations from left to right 12AX7 ECC83 12AX7 ECC83 V5 V4 6V6 12AT7 ECC81 V7 V6 12AX7 ECC83 12AX7 ECC83 V2 V1 12AT7 ECC81 V3 5AR4 GZ34 6V6 V9 V8 10737 Cut this label on the dotted line with a razor knife and metal straighte...

Page 66: ...stewmac com 64 2019 StewMac ...

Page 67: ...stewmac com 65 2019 StewMac ...

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StewMac 66 D-REVERB, Assembly Instructions Manual

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