Table of Contents
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Signal Output
(To Amplifier)
Use these instructions to learn:
How to build a tube preamp pedal
The Persuader uses a gain boost circuit driving a 12AX7 preamp tube operating in starved plate mode to go
from clean, warm tone to smooth, real tube overdrive.
Warning: This circuit was designed for use with a 9 VDC power supply only.
THE PERSUADER (K-930)
1
Unplug when not in use
Signal Input
(From Guitar)
9 VDC
CENTER (-)
ADAPTER
Copyright © 2014 by modkitsdiy.com
to save battery life.
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Table of Contents
Related Manuals for Mod THE PERSUADER
Summary of Contents for Mod THE PERSUADER
- Page 1 Use these instructions to learn: How to build a tube preamp pedal The Persuader uses a gain boost circuit driving a 12AX7 preamp tube operating in starved plate mode to go from clean, warm tone to smooth, real tube overdrive.
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Page 2: Table Of Contents
TABLE OF CONTENTS TOOL LIST …………………………………………………………………………...2 PARTS LIST DRAWINGS………………………………………………………….3, 4 FINAL ASSEMBLY REFERENCE DRAWING………………………………………5 SOLDERING TIPS …………………………………………………………………...6 STEP BY STEP ASSEMBLY INSTRUCTIONS ………………………………7 - 12 Section 1 – Mount ¼” Jacks and Terminal Strip Components ……...………...7 Section 2 – Mount the Potentiometer, Footswitch and DC Power Jack …..…...8 Section 3 –... -
Page 3: Parts List Drawings
PARTS LIST 1 Stranded Wire (22 AWG) - Blue DPDT Foot Switch K-PUL1569-BLUE (5 FT) P-H498 Enclosure P-H1590BBCE-P Preamp Tube (Dual Triode, High Mu) T-12AX7-S-JJ BOTTOM VIEW OF BASE PIN ORIENTATION Round Black Knob P-K325 Potentiometers: 250KA and 5KL R-V38-250KA R-V38-5KL Battery Clip S-H155... - Page 4 PARTS LIST 2 #4 Screws (3/8" long) 220µF Polarized Capacitor 50V S-HS440-38 C-ET220-50 220µF 50V #4 Nuts S-HHN440 1KΩ Resistor ½ W 15KΩ Resistor ½ W R-A1K R-A15K DC Power Jack S-H750 brown brown black green orange gold gold 1MΩ Resistor ½ W 33kΩ...
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Page 5: Final Assembly Reference Drawing
FINAL ASSEMBLY REFERENCE DRAWING This is a large version of the final assembly drawing. Refer to this drawing as you make your way through each step of the instructions. Before you make a new connection at a particular terminal or solder lug, notice how many other connections will be made at that terminal. That way you can decide whether it’s best for you to solder the connection and leave space open for future connections or hold off on soldering until after every connection at that location has been made. -
Page 6: Soldering Tips
SOLDERING TIPS It is important to make a good solder joint at each connection point. A cold solder joint is a connection that may look connected but is actually disconnected or intermittently connected. (A cold solder joint can keep your project from working.) Follow these tips to make a good solder joint. -
Page 7: Step By Step Assembly Instructions
SECTION 1 – Mount ¼” Jacks and Terminal Strip Componets Please refer to DRAWING 1 and DRAWING 2. Orient box with two 3/8" holes on top and ½” hole nearest you. Input Jack RING LUG Mount input jack in 3/8" hole on left side of box with hardware provided. Washer goes under nut on outside of box. -
Page 8: Section 2 - Mount The Potentiometer, Footswitch And Dc Power Jack
The remaining components and wires can be connected to the upper portion of their respective terminals. Unless otherwise noted, “mount” means to mount the component, solder the component in place and trim the leads. 3) Mount the BS170 MOSFET. Caution: MOSFETs can easily be damaged by static electricity. Handle with care. Terminals #2, 3 &... -
Page 9: Section 3 - Connect The 5Kl Potentiometer
Mount power adapter jack in 15/32” hole on bottom left side of box. Orient solder lugs on power adapter jack so larger center-pin lug is facing the bottom side of box. Tighten adapter jack. POSITIVE LUG POSITIVE-SWITCH LUG CENTER-PIN LUG Power Adapter Jack SECTION 3 –... -
Page 10: Section 5 - Connect The Dc Power Components
3) Fasten the two #4 nuts onto the two screws and tighten. 4) Mount the 5 lug terminal strip with the 5) Mount the 5 lug terminal strip with the grounded terminal #1 between the 5K pot and grounded terminal #5 between the 250K pot and the tube socket using #6 hardware. -
Page 11: Section 7 - Mounting Components In The Vacuum Tube Section
3) Cut a 3" piece of wire. Strip ¾” of insulation from one end and tin. Strip ¼” of insulation from the other end and tin. Connect: Tube Pins #3 & #8 to Terminal #13 Use the ¾” end to connect both tube pins #3 and #8. Suggestion: Route the wire along a path to terminal #13 so that its insulation also serves as a spacer between the terminal strip and the tube socket. -
Page 12: Section 8 - Wire The Output Jack And Footswitch Connections
4) Mount the 33K resistor to: Terminal #16 & Tube pin #6 5) Mount the 0.047 µF capacitor to: Terminals #14 & #15 6) Mount the 15K resistor to: Terminal #10 & Tube pin #2 (Do not solder the connection at pin #2, yet.) 7) Mount the 4.7K resistor to: Terminal #11 &... -
Page 13: Assembly Drawings (9 Drawings)
DRAWING 1 1/8" 3/8" 3/8" 3/4" 1/8" 3/8" 3/8" INSIDE VIEW OF THE ENCLOSURE 9/64" ½” BOTTOM DRAWING 2 Input Jack Output Jack 5.1K 220µF 50V... - Page 14 DRAWING 3 1/8" 250KA 1/8" Input Jack Output Jack 5.1K 220µF 50V DRAWING 4 250KA 10µF 50V 5.1K 220µF 50V...
- Page 15 DRAWING 5 When the instructions mention a terminal #__, this drawing illustrates the terminal numbering convention used for all three terminal strips. Terminal Numbering Convention 250KA DRAWING 6 250KA Input Jack Output Jack 10µF 50V 5.1K 220µF 50V BLACK...
- Page 16 DRAWING 7 250KA 10µF 50V 5.1K 220µF 50V DRAWING 8 4.7K...
- Page 17 DRAWING 9 250KA 4.7K Input Jack Output Jack 10µF 50V 5.1K 220µF 50V...
- Page 18 Use this troubleshooting supplement to help: Measure DC voltage test points to identify major discrepancies and locate problem areas. (Keep in mind that the voltage measurements will vary slightly from kit to kit. The voltages you measure should be in the same ballpark, but do not expect to get the exact same value.) Test Point Location Description...
- Page 19 Guitar cable must be plugged into the input jack while taking voltage measurements GROUND 250KA 4.7K 10µF 50V 5.1K 220µF 50V DC Voltage Test Points...
- Page 20 Turn all the Turn all the way up way up Guitar cable must be plugged into the input jack while taking voltage measurements 250KA GROUND 4.7K 10µF 50V 5.1K 220µF 50V Make sure the pedal is not in bypass mode. AC Voltage (Signal) Test Points Connect your guitar to the input jack and take AC voltage measurements at each test point with both controls turned all the way up.
- Page 21 Mexican strat set to full volume/ tone with pedal controls at max settings Plate2 Heater CT V1 (12AX7) BASING DIAGRAM Switching function of the DPDT switch. The solid line www.modkitsdiy.com Copyright © 2014 by modkitsdiy.com illustrates an internal connection between terminals. “The Persuader” (K-930) Schematic...