CUSTOM MADE MOD!S FOR VOX VALVETRONIX AMPS

VT20/40/80+ FX LOOP MOD #2 b

yjoewebbguitars

1856 Colfax Street Suite 8 Concord, Ca 94520

www.joewebbguitars.com

This is it! The new passive VT PLUS LOOP MOD KIT! This is one of the easiest and most complete loop mod kits available for the VOX VT+20/40/80/120 amps.

*This kit has the Mod assembled and ready to install (requires you to cut your existing rear panel and complete only four solder connections for installation).

We know you!re excited to use your new features, so lets get started.

*VOX, VT/VT+/AD are registered trade marks of the Korg/Vox Corporation with all rights reserved, Joe Webb Guitars is not affiliated with these companies or any other companies, any references to their name(s) is as a reference only and not intended as an infringement. Modification of any equipment covered under the factory warranty may void any claims you have for warranty service, check with your manufacturer to be sure before any alterations are made and proceed at your own risk. Joe Webb Guitars can not be held responsible for any losses, damages and/or injuries that may incur by or during the installation of their mods, kits and or products. All of our mods, kits and products are use at your own risk! R.H. WEBB

NOTE; this kit is intended for the VT+ amps only, it will not work with any other amp models other than

what it is intended for.

page #1

INSTRUCTIONS Please read through the instructions completely before starting and use the pictures as references where indicated. If you any questions e-mail retrorockit@yahoo.com

STEP #1Unplug the amp!s power cable from the power source it is plugged into and remove the power cable from the rear of the amp. Set the power cable aside away from the amp, being absolutely sure the power cable is disconnected from the amp.

*WARNING!! The power must be disconnected from the amp before installing this mod/kit, failure to comply could result in serious injury or death!

Using a philips screw driver remove the indicated rear panel screws, store these screws in a zip lock bag.

Remove these rear panel

machine thread chassis

screws (red arrow),

and these wood screws

(green arrow) in the rear

panel.

Gently remove the rear panel from the amp. CAUTION; sometimes the rear panel is stubborn, do not try to pry it off, instead tap around the edges briskly with the palm of your hand to loosen it. Once the rear panel is removed set it a side out of the way.

With the rear panel off your speaker is now exposed, using a permanent marker pen, mark the speaker terminal where the black (-) speaker wire attaches to the speaker and unplug both the white and black speaker wires from the speaker.

Mark the speaker where the black (-) wire is

attached and disconnect the speaker wires.

page #2

STEP #2VT20/40+ rear panelLay the amp!s original rear panel finished side down on a flat surface. Using the VT20/40+ REAR PANEL CUT-OUT TEMPLATE, fold the template as directed for your amp model and place it on the rear panel as instructed on the template. Once the template is positioned correctly, draw a pencil line around it so it can be relocated easily. Spray the back of the template with a light coat of adhesive and re-apply the template to the rear panel.

Place the template on

the back side of the rear

panel and cut out the control

opening as indicated

Using the appropriate tools and safety procedures, cut the opening for the new FX LOOP MOD control plate by following the template lines as indicated on the template at the rear panel. The Mod cut-out should be a square hole with 1/2 radius corners 3 - 1/2 tall by 6 - 1/2 wide when finished. Test fit the new FX LOOP MOD control plate in the rear panel!s cut-out and adjust the cut-out as needed so that the control plate!s markings are fully visible. Sand and paint the cut-out edges with black paint, let the paint dry completely.

Holding the rear panel up on edge (rear panel bottom edge down), position the FX LOOP MOD control plate in the rear panel opening (unfinished side) align the faceplate!s mounting holes with the template holes, looking at the finished side, adjust the faceplate so it is centered in the cut-out opening and mark its position on the rear side using a pencil.

Holding the rear panel on edge, check the alignment for the

controls in the panel!s opening

Lay the rear panel flat, position the FX LOOP MOD back into the correct position, mark the top center attaching hole at the FACEPLATE onto the panel and drill a pilot hole using a 1/16 bit drill 3/8 deep. Fasten the FX LOOP MOD into place using one of the 7/16 wood screws at the top center of the FACEPLATE, re-check for proper alignment, adjust as needed, mark the remaining holes and drill pilot holes for each. Remove the FACEPLATE and apply a small bead of clear latex with silicone sealant around the outside edge of the faceplate where it contacts the rear panel, reinstall the faceplate using the 6 - 7/16 screws and clean up any sealant residue. Look everything over to make sure it is a neat looking job and all procedures have been completed.

page #3

VT80+ rear panelLay the amp!s original rear panel finished side up on a flat surface, using a sharp knife carefully cut the glue loose from the edges of the vent to the panel, turn the rear panel over (finished side down) and carefully remove the hot glue aplied at the vent stand to secure them and remove the vent from the rear panel.

Using the VT80+ REAR PANEL CUT-OUT TEMPLATE, align the template so the left template edge matches the rear panel!s left edge and the template!s top edge matches the rear panel!s cut out lower edge. Once the template is positioned correctly, draw a pencil line around it so it can be relocated easily. Spray the back of the template with a light coat of adhesive and re-apply the template to the rear panel.

Place the template on the back side of the rear panel and

align left edge to panel!s edge and top to panels cut out lower edge, cut out the Mod

opening and vent as indicated

Using the appropriate tools and safety procedures, cut the opening for the new FX LOOP MOD control plate by following the template lines as indicated on the template at the rear panel. The Mod cut-out should be a square hole with 1/2 radius corners 3 - 1/2 tall by 6 - 1/2 wide when finished, the vent cut-out should be a square hole with 1/2 radius corners 5 - 5/16 tall by1 - 5/16 wide when finished. Test fit the new FX LOOP MOD control plate in the rear panel!s cut-out and adjust the cut-out as needed so that the control plate!s markings are fully visible. Test fit thevent in the rear panel!s new vent cut-out and adjust the cut-out as needed to fit the vent. Sand and paint the cut-out edges with black paint, let the paint dry completely.

Holding the rear panel up on edge (rear panel bottom edge down), position the FX LOOP MOD control plate in the rear panel opening (unfinished side) align the faceplate!s mounting holes with the template holes, looking at the finished side, adjust the faceplate so it is centered in the cut-out opening and mark its position on the rear side using a pencil.

Holding the rear panel on edge, check the alignment for the

controls in the panel!s opening

Lay the rear panel flat, position the FX LOOP MOD back into the correct position, mark the top center attaching hole at the FACEPLATE onto the panel and drill a pilot hole using a 1/16 bit drill 3/8 deep. Fasten the FX LOOP MOD into place using one of the 7/16 wood screws at the top center of the FACEPLATE, re-check for proper alignment, adjust as needed, mark the remaining holes and drill pilot holes for each. Remove the FACEPLATE and apply a small bead of clear latex with silicone sealant around the outside edge of the faceplate where it contacts the rear panel, reinstall the faceplate using the 6 - 7/16 screws and clean up any sealant residue. Apply a small amount of sealant around the edge of the vent and install the vent into the rear panel, apply sealant at the vent stands on the back side of the rear panel and clean up any sealant residue. Allow the sealant to dry completely. Look everything over to make sure it is a neat looking job and all procedures have been completed.

page #4

STEP #3Support the amp chassis from underneath on the inside the box and remove the three indicated chassis screws at the top of the amp and carefully slide the amp chassis out of the amp box and place the chassis on your work space.

While holding the chassis in place, remove the three machine thread chassis

screws at the top (red arrows).

Place the chassis with the controls facing down and the back of the chassis away from you (open end towards you), this will put the side of the circuit board with the tube socket on your left. Locate the SOLDERING TEMPLATE, remove the backing and stick the template to the tube socket side of the circuit board, aligning the template so it sets over the two board mounting screws orientating the template per its alignment markings.

Apply the SOLDERING TEMPLATE onto the circuit board, over the two board screws and per the alignment markings

page #5

Remove the cellophane wrapping from the end of the loop harness cable exposing the four pre-tined and fluxed wire ends. Using a 20 watt soldering iron with a pencil tip (sharp point), clean and tin your iron!s tip before each connection (see soldering tips) and solder each of the mod!s connecting wires in an upright position one at a time through the access holes in the template per the wire colors and marking labels on the template. The wire ends are stripped to the proper length and have solder and flux applied to them already, no additional solder other than what is needed to tin the iron tip should be necessary.

Solder the MOD!s wires to the indicated connections through the provided access holes in the template.

Remove the soldering template from the board and inspect each connection for a clean and secure solder joint, touchup any joints if needed. Make sure no wire connections cross over or touch any other connections on the board.

Remove the twisty tie from the mods wires holding the insulating tubing up and discard the twisty tie, slide the insulating heat shrink tubing down each wire to its connection and secure it in place using a hair drier. Place the plastic cable strap around the LOOP cable and install the strap to the circuit board under the indicated circuit board screw (a washer is supplied if needed), secure the LOOP cable to the strap with a wire tie.

Remove the SOLDERING TEMPLATE from the circuit board, and inspect each connection for a clean, secure attachment. Remove the twist tie from the wires, slide the heat shrink tubing down each wire to the connection point and

secure in place using a hair drier. Install the plastic cable strap around the cable, secure it to the board and cable tie the cable to the strap.

page #6

Carefully slide the amp chassis back into the top of the amp box, holding the chassis in place, re-install the three top machine thread chassis screws, leaving them slightly loose for now.

While holding the chassis in place, re-install the three machine thread chassis

screws at the top (red arrows) and hand tighten.

Insert the headphone disable pin into the original 1/8 headphone jack at the top of the amp (small black plastic pin), the disable pin must be installed for the loop to function properly.

Headphone disabling pin inserts into existing headphone jack holding the jack!s contacts open.

*NOTE; the disable pin for the amp!s original 1/8 headphone jack must be installed for the loop mod to function properly.

page #7

STEP #4Connect the amp!s speaker wires as follows;*NOTE; if you have a VT120+, skip the VT20/40/80+ section and go to the VT120+ extension speaker section below that applies.

VT20/40/80+, external speaker, this disconnects the amp!s existing speakers (your amp!s speakers will not work along with the extension cabinet!s speakers).

Slide the 1/4 x 1 insulation tubing over the amp!s WHITE and BLACK wires with the female connector, pushing the tubing up the wire out of the way for now. The amp!s WHITE wire plugs into the mod!s WHITE wire!s fuse male terminal, the amp!s BLACK wire plugs into the mod!s BLACK wire!s fuse male terminal. Slide the insulation tubing down over the connections at each of these wires so it completely covers the wire and fuse terminal, then secure the tubing in place using a hair dryer and the provided cable ties.

Plug the amp!s WHITE wire onto the mod!s WHITE wire!s fuse terminal and insulate.

Plug the amp!s BLACK wire onto the mod!s BLACK wire!s fuse terminal and insulate.

Connect the mod!s new RED speaker wire onto the speaker!s positive (+) terminal. Connect the mod!s new GREEN speaker wire onto the speaker!s negative (-) terminal (this is the terminal you marked earlier with the black marker). Push the insulation tubing down over the connection at the fuse terminals and secure it in place by heating the tubing with a hair dryer, then further securing with one of the 3 cable ties.

Plug the mod!s RED wire onto the speaker!s POSITIVE terminal.

Plug the mod!s GREEN wire onto the speaker!s NEGATIVE terminal.

Secure the insulation tubing at the fuse terminals, bundle the wires using wire ties and trim wire ties flush.

Bundle the speaker wires together and secure them out of the way using one of the supplied cable ties, trim off the excess from all wire ties.

Double check to be sure all speaker plugs are inserted into each other completely and correctly, make sure all connections are insulated where indicated.

page #8

*VT120+, extension speaker, this places the external cabinet in series with your amp!s existing speakers (your amp!s speakers will work along with the extension cabinet!s speakers).

Slide the provided 1/4 x 1 insulation tubing over the amp!s BLACK wire with the female connector, pushing the tubing up the wire out of the way for now. The amps BLACK wire plugs into the mod!s BLACK wire!s fuse male connector. The amp!s WHITE wire with the female connector plugs onto the speaker!s POSITIVE (+) terminal. The mod!s new GREEN wire plugs onto speaker!s NEGATIVE (-) terminal (this is the terminal you marked earlier with the black marker).

Plug the amp!s WHITE wire onto the speaker!s POSITIVE terminal.

Plug the mod!s GREEN wire onto the speaker!s NEGATIVE terminal.

Plug the amp!s BLACK wire onto the mod!s BLACK wire!s fuse terminal.

Push the insulation tubing down over the connection at the fuse terminal and secure it in place by heating the tubing with a hair dryer, then further securing with one of the 3 cable ties.

Secure the insulation tubing at the fuse terminals, bundle the wires using wire ties and trim wire ties flush.

Bundle the speaker wires together and secure them out of the way using one of the 3 cable ties.

Double check to be sure all speaker plugs are inserted into each other completely and correctly, make sure all connections are insulated where indicated.

page #9

STEP #5Re-install the rear panel and hand start the screws as indicated.

Re-install the rear panel

machine thread chassis

screws (red arrow),

and the wood screws

(green arrow) in the rear

panel.

Tighten the rear panel and top chassis screws snugly, careful to not over tighten them, you can deform the covering material by over tightening the screws.

Plug the amp!s power cable back into the amp and into the power supply source.

Plug in your guitar and turn your amp on, it!s time to try out your new effects loop mod!

Enjoy!

page #10

INCLUDED IN THE VT+ FX LOOP MOD KIT #2 1 - VT+ LOOP MOD KIT #2 (assembled ready to install, *no rear panel)

10 - 3 Cable ties 1 - Plastic cable strap and washer 2 - 1/4 x 1 insulation tubing 6 - 7/16 screws 1 - Headphone jack disable pin 1 - Extra 5 amp blade type fuse 1 - Rear panel cut-out template 1 - VT+ Soldering template 1 - Soldering tips

TROUBLE SHOOTINGThe amp has no sound;

Is the amp plugged into the power source and turned on? Plug in amp and turn amp on.

Is the mute switch in the the off position? Put the mute switch in the off position.

Is the master volume and attenuation controls turned up? Turn up master and attenuation controls.

Is your guitar plugged into the amp? Plug guitar cable into amp and guitar, try a different cable.

Is the guitar!s volume control turned up? Turn the guitar!s volume control up.

Is something plugged into only the send jack, or only the return jack? Circuit is not complete unless the send and return jacks are used together in series or not at all.

Did you make sure all the internal and speaker plugs are inserted completely? Re-insert all plug connections.

Did you make sure the amp!s speaker plugs are connected to mod!s speaker plugs correctly? Check all connections verifying they are according to instructions.

Is the mod!s speaker fuse blown? Check all connections verifying they are according to instructions and replace fuse if needed.

The loop mod does not function properly? Did you insert the headphone jack disable pin into the 1/8 original headphone jack (small black

plastic pin included in kit), the disable pin must be in place for the loop to function properly.

Limited Warranty

WARRANTY COVERAGEWarranty obligations are limited to the terms set forth below: Joe Webb Guitars (JWG) warrants this product against defects in materials and workmanship for a period of ONE (1) YEAR from the date of original retail purchase. If a defect exists, at its option Joe Webb Guitars will (1) repair the product at no charge, using new or refurbished replacement parts, (2) exchange the product with a product that is new or which has been manufactured from new or serviceable used parts and is at least functionally equivalent to the original product. A replacement product/part assumes the remaining warranty of the original product or ninety (90) days from the date of replacement or repair, whichever provides longer coverage for you. When a product or part is exchanged, any replacement item becomes your property and the replaced item becomes Joe Webb Guitars property.

OBTAINING WARRANTY SERVICEReturn the product, at your expense, to Joe Webb Guitars, along with your name, address, telephone number, and proof of the original purchase (receipt) containing a description of the product(s), purchase date, and the appropriate serial number(s) if they apply and a brief description of repairs needed. If the repair is deemed to be a warranty repair the repair will be made at no cost to you and shipped back to you, at your expense. If the repair is deemed to be a non-warranty repair you will be notified and given the option of having the repair made at additional cost to you and shipped back to you, at your expense.

EXCLUSIONS AND LIMITATIONSThis Limited Warranty applies only to products manufactured by or for Joe Webb Guitars. This limited warranty does not apply: (a) to damage caused by accident, abuse, misuse, misapplication, or non-Joe Webb Guitars products; (b) to damage caused by service (including upgrades and modifications) performed by anyone who is not a Joe Webb Guitars Authorized Service Provider; (c) to a product or a part that has been modified without the written permission of Joe Webb Guitars; or (d) if any Joe Webb Guitars serial number has been removed or defaced. THIS WARRANTY AND REMEDIES SET FORTH ABOVE ARE EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES, REMEDIES AND CONDITIONS, WHETHER ORAL OR WRITTEN, EXPRESS OR IMPLIED. JOE WEBB GUITARS SPECIFICALLY DISCLAIMS ANY AND ALL IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IF JOE WEBB GUITARS CANNOT LAWFULLY DISCLAIM IMPLIED WARRANTIES UNDER THIS LIMITED WARRANTY, ALL SUCH WARRANTIES, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE LIMITED IN DURATION TO THE DURATION OF THIS WARRANTY. No Joe Webb Guitars reseller, agent, or employee is authorized to make any modification, extension, or addition to this warranty. JOE WEBB GUITARS IS NOT RESPONSIBLE FOR DIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM ANY BREACH OF WARRANTY OR CONDITION, OR UNDER ANY OTHER LEGAL THEORY, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DOWNTIME, GOODWILL, DAMAGE TO OR REPLACEMENT OF EQUIPMENT AND PROPERTY, ANY COSTS OF RECOVERING. Some states and provinces do not allow the exclusion or limitation of incidental or consequential damages or exclusions or limitations on the duration of implied warranties or conditions, so the above limitations or exclusions may not apply to you. This warranty gives you specific legal rights, and you may also have other rights that vary by state or province.

page #11

HOW IT WORKS; The SEND jack is located on the top left side of the VT LOOP MOD!s panel, when a cable is inserted it redirects the

signal out of the pre-amp section of the amp, sending it to your effect of choice. When nothing is plugged into this jack

the internal connection completes the circuit, plugging into this jack interrupts the circuit path diverting the signal to the

device plugged into it. This jack can also be used as a pre-amp out, sending the pre-amp signal to another power amp

source. *NOTE; If a cable is plugged into this jack only, no sound will come out of the amp.

The RETURN jack is located on the bottom left side of the VT LOOP MOD!s panel, when a cable is inserted it redirects

the signal into the power amp section of the amp before the tube, returning the signal from your effect of choice. When

nothing is plugged into this jack the internal connection completes the circuit, plugging into this jack interrupts the

circuit path diverting the signal from a device plugged into it. This jack can also be used as a power-amp in, receiving the

signal from another pre-amp source. *NOTE; If a cable is plugged into this jack only, then only the

sound from the device plugged into it will come out of the amp.

ADJUSTING THE LOOP; Each effect that is used in the loop needs to have its level adjusted for maximum

performance. This is easy to do by listening to your amp before the effect is placed into the loop then place the effect

into the loop and listen again. Now adjust the effect!s input/output level controls to match the same volume as when it

was not in the loop. *NOTE: remember your cables go from the loops SEND jack to the effects INPUT

jack and from the effects OUTPUT jack to the loops RETURN jack.

The CD input jack is located on the bottom left of center side of the VT+ LOOP MOD!s panel, when a cable is inserted it

injects the signal from any CD / MP3 player into the return section of the circuit, you can adjust the level of the CD / MP3

player to match your guitar levels using the CD level control (located above the CD input) in conjunction with the amp!s

master volume control.

The HEADPHONE jack is located on the bottom right of center side of the VT+ LOOP MOD!s panel, the headphone

circuit is now placed after the effects loop and CD / MP3 player input, so anything going into the amp can be heard

through the headphones. Plus the headphone jack is no longer a through circuit (the signal does not go through the

headphone jack to complete the amp!s circuit) and will not effect the signal path of the amp (no more dirty headphone

jack contacts causing the amp!s sound to degrade). *Use the mute switch for silent use (speaker off = mute on)

The HEADPHONE jack can also be used as a LINE OUT for sending signal to a PA or recording device. However the

line out plug when inserted into the headphone jack should be pulled back out slightly (insert the cable plug and pull it

out one click), this allows the mono signal to be sent to your PA or recorder without any signal loss. *Use the mute

switch in conjunction with this feature for either silent use (speaker off = mute on) or monitor use (speaker on = mute

off).

The MUTE SWITCH is located on the top right of center side of the VT+ LOOP MOD!s panel, this switch has 2

positions, up and down. In the DOWN position the mute circuit is off (speaker on), in the UP position the mute circuit is

on (speaker off for private listening).

The FOOT SWITCH foot switch jack is located on the top right side of the VT+ LOOP MOD!s panel, this allows a

standard single button foot switch to control the MUTE circuit (foot switch available separately). When the FOOT

SWITCH jack is in use the MUTE SWITCH is de-activated and only the foot switch will control this features.

EXTERNAL SPEAKER (*VT20/40/80+ models only) jack is located on the bottom right side of the VT+

LOOP MOD!s panel, speaker impedance should be no less than 4", when a speaker cable is inserted it redirects the

speaker signal to the external speaker, disconnecting the internal speaker. *NOTE; to prevent damage from

occurring to your amp, the amp should always be turned off before plugging into and out of the

external speaker jack.

EXTENSION SPEAKER (*VT120+ model only) jack is located on the bottom right side of the VT+ LOOP

MOD!s panel, speaker impedance should be no less than 4", when a speaker cable is inserted it redirects the speaker

signal in series with the internal and external speaker cabinet, allowing both the internal and external speakers to

operate together. *NOTE; to prevent damage from occurring to your amp, the amp should always be

turned off before plugging into and out of the external speaker jack.

SPEAKER FUSE, fuses have been added at the speaker connection wires to protect the amp in the event of a

shorted speaker or connection, if the fuse blows check for shorts/bad connections before replacing the fuse (an extra

fuse is included in the kit).

page #12