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Reverb you can't

get from a pedal.

Be excited!

This is the unit that put the waves in surf music!

Looks like an amp, sounds like a beach party .
This tube-driven reverb tank relies on good ol’

physics for a perfect effect . Your guitar signal

travels along two large suspended springs to

produce the reverb that launched the iconic

surf sound .

This reverb unit is an ICON

The greats of surf rock used this king of spring to get their submerged,

tubluar tones . Controls for dwell, mix, and tone take you from dark,

atmospheric decay to bright and snappy splash .

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 StewMac

These immersive instructions walk you through every step of creating this

tone machine . And you’ll learn a lot, gaining a deep knowledge of your

reverb unit’s inner workings .
Follow our steps closely for safety, too: we’ve carefully laid out a path that

even newcomers can follow in handling electrical components .
Building an electronics kit can seem daunting, but nobody makes it easier

than StewMac . Watch for helpful tips along the way, too—we’re here to help!

Let’s get building!

’64 REVERB UNIT

KIT

O R I G I N A L 6 G 15 C I R C U I T

Содержание 64 REVERB UNIT

Страница 1: ...ASSEMBLY INSTRUCTIONS Reverb you can t get from a pedal With loads of helpful tips 64 REVERB UNITKIT ORIGINAL 6G15 CIRCUIT ...

Страница 2: ...the chassis components 24 Installing the heater wires 27 Completed 6G15 wiring 30 Final assembly 31 Testing and troubleshooting 32 Learning more secrets revealed in the schematic 34 6G15 circuit schematic 35 Tube replacement chart 39 COPYRIGHT WARNING This material is protected by copyright and has been created by and solely for the purposes of StewMac You may not sell alter or further reproduce a...

Страница 3: ...hat 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 StewMac These immersive instructions walk you through every step of creating this tone machine And you l...

Страница 4: ...uild this kit See page 17 Wiring comes later 1 First you ll wrap the leads connecting them without solder 2 Then double check all the connections Don t rush 3 When everything checks out it s time to solder The numbered steps tell you when Get the cabinet ready starting at Step 1 on page 9 You ll prep the metal chassis and the eyelet board too Learn more You don t need to read the schematic but it ...

Страница 5: ...tal oxide r 1 10K 2W metal oxide Brown Black Brown Gold Brown Green Red Gold Brown Black Orange Gold Brown Black Yellow Gold Red Red Yellow Gold Brown Black Green Gold Red Red Green Gold Brown Black Red Gold Brown Black Orange Gold A magnifier helps Diode r 3 1N4007 1000V rectifier diode Cabinet and Chassis r 1 Cabinet r 1 Capacitor pan r 1 Chassis r 2 Eyelet boards r 2 Insulator boards 250μF 22μF...

Страница 6: ...ket r 1 Tension clip for eight pin tube socket r 1 12AX7 preamp tube also called ECC83S r 1 12AT7 preamp tube also called ECC81 r 1 6V6S power tube r 1 Fuse socket r 1 Fuse 1 amp slow blow r 1 Pilot lamp socket with lens r 1 Pilot lamp bulb 47 Terminals knobs and cords r 1 100K control pot L linear taper r 2 250K control pot L linear taper r 3 Knob r 1 Three lug terminal r 1 Four lug terminal r 1 ...

Страница 7: ...ing eyelet board to chassis 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 bending pliers Item 1609 Round Nose Be...

Страница 8: ...er can bridge a hot connection to ground Wear safety glasses Rosin core solder sometimes bubbles up and it can spew molten specks into the air You don t want molten solder in your eyes It s better not to work alone Electrical shocks can incapacitate you and having someone available to call 911 can be a lifesaver Take breaks and stop when you re tired Fatigue leads to mistakes and no one can afford...

Страница 9: ...uch too large for use here Caps for this unit 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 some parts of audio circuits such as the path...

Страница 10: ... 21 33 34 3 20 27 16 2 12 15 19 25 1 M 18 24 26 32 28 25µF 10 3J 60 0V 222J 600V 25µF 104J 600V 104J 600V 473J 600V 250μF Our diagrams show a flat view of the metal chassis Complete wiring diagram Here s the complete 6G15 wiring When you ve finished the kit you ll have connected all the parts shown in this wiring diagram If it looks complex now don t worry we ll start at the very beginning and do ...

Страница 11: ... are sufficiently tight Start by prepping the cabinet Check off each completed step V 12AX7 V 12AX7 POWER FUSE PILOT LIGHT V 6V6 POWER TRANSFORMER Mounted outside OUTPUT TRANSFORMER Mounted outside 4 3 2 1 8 7 6 5 6 43 2 1 9 8 7 5 6 43 2 1 9 8 7 5 1 MA 1 MA 1 MA 14 11 10 M 17 23 31 9 8 7 6 5 5 22 29 35 36 37 38 39 30 4 21 33 34 3 20 27 16 2 12 15 19 25 1 M 18 24 26 32 28 64 REVERB UNIT O R I G I N...

Страница 12: ...ilt on two eyelet boards Signalprocessinghappenson the main board and a smaller board holds the filter capacitors For each eyelet board there s a blank board of the same size These blanks serve as insulators to keep the eyelet board circuits from contacting the metal chassis The pairs of boards mount to the chassis with machine screws Mounting holes are already in the eyelet boards but you ll need...

Страница 13: ...nit for different voltages depending on the electrical system where you live The black wire is used in all cases and it s twisted together withanotherwiredependingonyour country s voltage 100V orange 120V white 220V black yellow striped 240V black red striped In North America for example you would twist the white wire together with the black wire for 120V Twist the three unused transformer wires t...

Страница 14: ... Using two 8 32 machine screws mount the filter choke to the outside of the chassis Mount the modified three lug grounding strip under the front locknut STEP 14 Mount socket V3 tension clip OrientsocketV3sopin1isnearestthe opening of the chassis Use two 4 40 x 3 8 machine screws to mount the socket outside of the chassis As you installthissocket addthetensionclip to support the tube This clip is h...

Страница 15: ...0Ω resistors together to join them Wrap the other leads of these resistors to the lugs of the pilot lamp socket Don t solder the pilot lamp lugs yet but solder the twisted resistor leads to each other and then solder the twisted leads to the middle lug of the three lug terminal strip under the pilot lamp assembly STEP 21 Install the control pots Mountthepotssotheirlugsarefacing up Whenwerefertothe...

Страница 16: ...ing This way if the inside components do get a little too hot it won t leave an imprint in a position you might need to use later STEP 24 Install the silver mica capacitor Wrap one lead of a 250pF silver mica cap through the right lug of the mix pot Wrap the other lead of this cap through the middle lug of the tone pot Solder both leads in place STEP 25 Add one jumper Cut one 4 1 4 white wire Wrap...

Страница 17: ...sembly You can twist the other red lead in with itself to keep it out of the way This lead will be connected to the eyelet board once the eyelet board is installed STEP 29 Terminate the power transformer s unused leads Thethreeunusedleadsfromthepow er transformer will carry hundreds of volts so they need to be safely terminated and not hanging loose in the chassis Cut these wires to length and sol...

Страница 18: ...d a 3 4 white jumper between the center lug of the reverb out jack and the center lug of the footswitch jack Solder the connection to the center lug of the reverb out jack Solder the connection to the center lug of the footswitch jack along with the jumper from socket V1 STEP 32 Inspect and double check This is a good time to step away from the project for a few minutes and take a break When you r...

Страница 19: ...nectionreaches 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 damp sponge Keepittinnedbyoccasionallymelting a little solder onto it n Feed solder to the connection not to the iron Keep the iron on the con nection for a second longer to allow time for all of the flux to c...

Страница 20: ... positive lead through eyelet G and the negative through eyelet C Wrap a third 22μF electrolytic cap between eyelets H positive lead and D negative STEP 34 Add two jumpers Wrap a 1 1 4 green jumper between eyelets B and C Add another 1 1 2 green jumper between eyelets C and D STEP 35 Add one resistor Add a 10K resistor between eyelets G and H STEP 36 Add three more jumpers Add a 6 green jumper to ...

Страница 21: ...ange Drop cap between eyelets 39 and 11 This and the fol lowing Orange Drop caps are not polarized so you can install them in either direction We recommend fac ing them all in the same direction to maketheirprintedspecseasytoread STEP 40 Add two resistors another cap Add another 100K resistor between eyelets 23 and 38 Add a 2 2M resistor between eyelets 23 and 37 Wrap a 1μF Orange Drop cap be twee...

Страница 22: ...h hole 7 and threadtheotherendthroughhole29 Flip the board over and add a 5 blue jumper to the back of eyelet 23 Thread this jumper up through hole 17 and pull it tight to keep it in place STEP 45 Add a cap resistor pairing Wrap the leads from the 1 5K resistor around the leads on the 25μF 50V capacitor and solder them in place Notethepolarityofthecapacitor Installthisresistor capacitorassembly be...

Страница 23: ...ng Wrap the leads from the 1K resistor around the leads on the 25μF capac itor and solder them into place Notethepolarityofthecapacitor Installthisresistor capacitorassembly between eyelets 4 and 33 making sure the capacitor s negative lead goes to eyelet 4 STEP 51 Add two resistors Add a 220K resistor between eyelets 4 and 5 Add a 1 5K resistor between eyelets 4 and 21 STEP 52 Add three rectifier...

Страница 24: ...54 Add six jumpers Add a 2 1 2 white jumper to eyelet 34 Add a 2 3 4 white jumper to eyelet 33 Add a 3 white jumper to the bottom ofeyelet24 thenthreadtheotherend up through hole 26 and pull tight to keep in place Add a 5 green jumper to eyelet 4 Cut two 3 4 white jumpers and remove their insulation Add one between eyelets 1 and 2 Add the second between eyelets 18 and 24 STEP 55 Review your work A...

Страница 25: ... main eyelet board on the floor of the chassis where it will be mounted and adjust these jumpers Install the filter cap board and its insulation board first on the exte rior of the chassis Run a 6 32 x 1 2 machine screw through the inside of the chassis and then lay down the insulation board then the filter cap board Secure it with a locknut on the outside of the chassis Feed the green red and whi...

Страница 26: ...rom eyelet 39 through pin 8 of socket V1 and solder in place Wrap the white jumper from eyelet 37 through pin 7 of socket V1 and solder in place Trim all excess wire ends and inspect your solder joints STEP 60 Solder tube socket V2 Wrap the white jumper from eyelet 35 through pin 1 of socket V2 and solder in place Wrap the white jumper from eyelet 34 through pin 6 of socket V2 and solder in place ...

Страница 27: ...t 19 STEP 64 Install the filter choke leads Coming through the grommeted hole near the back wall of the chassis will be the black filter choke leads Solder one of these leads to eyelet 1 and solder the other lead to eyelet 18 STEP 65 Solder the three leads from the filter cap board Solderthewhitejumpercomingfrom the filter cap board to eyelet 3 Solder the red jumper coming from the filter cap boar...

Страница 28: ...whitejumperfromeyelet6 to the right lug of the dwell pot STEP 68 Solder the input jack Solderthewhitejumperfromeyelet9 to the right lug of the input jack along with the resistor lead already in place Trim any excess leads and inspect all three solder joints on the jack STEP 69 Solder the mix pot Solder the white jumper from eyelet 11 to the left lug of the mix pot Trim the excess wires STEP 70 Sol...

Страница 29: ...EP 72 Connect to the pilot lamp Cut two 8 1 2 green jumpers and twist them together leaving one inch of untwisted wire on each side Wrap the two wires from one side of thistwistedpairthroughthe twolugs of the pilot lamp assembly Solder these leads into place with the two 100Ω resistors and the green power transformer leads STEP 73 Connect to tube socket V3 Cut two 6 green jumpers Twist them togeth...

Страница 30: ...r the otherpairoftwistedwiresintopin9of socket V2 Run these twisted pairs up an inch from the tube socket and turn them at a 90 angle toward socket V1 Trim the excess wire POWER FUSE PILOT LIGHT DWELL INPUT MIX TONE OUTPUT REVERB IN FOOTSWITCH REVERB OUT V2 12AT7 V1 12AX7 V3 6V6 4 3 2 1 8 7 6 5 6 43 2 1 9 8 7 5 6 43 2 1 9 8 7 5 14 11 10 M 17 23 31 9 8 7 6 5 13 22 29 35 36 37 38 39 30 4 21 33 34 3 ...

Страница 31: ...ct the power cord leads Solder the power cord s white wire to the right lug on the power switch Solder the power cord s black wire to thecenter backlugofthefusesocket Danger Soldering this lead to the side lug of the fuse socket will create a shock hazard Solderthepowercord sgreenground wire to the grounded lug of the ter minal strip Take a break and review your work You ve soldered all the compon...

Страница 32: ... 7 6 5 6 4 3 2 1 9 8 7 5 6 4 3 2 1 9 8 7 5 2 5 0 K L 2 5 0 K L 1 0 0 K L 103J 600V 250 5 14 11 10 M 17 23 31 9 8 7 6 5 13 22 29 35 36 37 38 39 30 4 21 33 34 3 20 27 16 2 12 15 19 25 1 M 18 24 26 32 28 25µF 10 3J 60 0V 222J 600V 25µF 104J 600V 104J 600V 473J 600V 250μF Completed 6G15 wiring 64 REVERB UNIT 6G15 CIRCUIT SCHEMATIC 10733 2018 StewMac ...

Страница 33: ...ng screws to mount the capacitor pan on the chassis cov ering the filter cap board STEP 79 Install the fuse Insert the 1 amp fuse into the fuse socket from the front of the chassis Make sure the socket cap is secure Never use a fuse rated above 1 amp in this unit Final assembly STEP 80 Install the pilot lamp bulb Insertthepilotlampbulbintoitssock et from the front of the chassis and twist until it...

Страница 34: ...gative lead is secured to ground measure the DC voltage at eyelet 2 for your B voltage This should be roughly 420V DC Unplug the unit Danger Remember to discharge the capacitors before working on the circuit See how to use a snuffer stick on page 6 Any multimeter will work fine for the two types of tests we re about to do checkingcontinuityandreading voltages The instructions that came with your m...

Страница 35: ...orrectly installed plug the unit back in The pilotlampshouldlightup Lettheunit warm up for a few minutes Again if you get smoke or smells unplug immediately Connect your multimeter s negative lead to ground Set the multimeter to 5V DC and check eyelet 32 which should read around 1 3V Set the multimeter to 200V DC and checkeyelet39 itshouldreadaround 130V If all of these voltages come within approx...

Страница 36: ... determines the amount of highs or lows that are bled to ground The tone pot then passes the processed signal to the mix pot where the processed signal is mixed back in with the dry signal The dry signal is a part of the signal that was split from the input jack and sent to the mix pot unprocessed The power supply stage provides power to the other circuit stages as well as the tube heaters and pil...

Страница 37: ...tput REVERB TANK FOOTSWITCH FUSE INPUT DWELL IN OUT V1 12AX7 V2 12AT7 V3 6V6 REVERB TRANSFORMER 68319 A POWER TRANSFORMER 125A12A 295 V 300 V 130 V 250 V 105 V 1 2 1 8 V 3 160 V 1 250 V 6 120 V 7 2 3 8 2 V 1 2 V 1 M 01 μF 0022 μF 047 μF 1 μF 01 1 μF 250 pF 1 5 K 1 5 K 100 K 100 K 220 K 100 K 10 K 25 μF 25 V 1 K 2 W 2 2 M 10 K 2 W 22 μF 500 V 22 μF 500 V 22 μF 500 V To tube heaters and pilot light ...

Страница 38: ...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...

Страница 39: ...00 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 wa...

Страница 40: ...stewmac com 38 2018 StewMac ...

Страница 41: ...V3 V2 V1 10733 64 REVERB UNIT O R I G I N A L 6G 1 5 C I R C U I T StewMac I C O N K I T S Use only 1 amp slow blow fuse DANGER Unplug the unit before changing tubes Tube locations from left to right 6V6 12AT7 ECC81 12AX7 ECC83 V3 V2 V1 10733 Cut this label on the dotted line with a razor knife and metal straightedge Fasten it to the bottom of the cabinet using thinned wood glue or contact cement ...

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