Trinity Amps Tramp User manual

Version 21.9
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The Trinity Amps
Tramp
Amp Builders Guide
For the sole personal use of Trinity Amps Tramp Customers.
Dec 2021, Version 21.9 Parts © Trinity Amps 2005 –2021
www.trinityamps.com

Version 21.9
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Contents
Introduction ..............................................................................................................................................................................5
Sources of help. ........................................................................................................................................................................5
Acknowledgements..................................................................................................................................................................5
WARNING...............................................................................................................................................................................7
Thank You.................................................................................................................................................................................8
Version Control........................................................................................................................................................................9
About the Tramp................................................................................................................................................................... 10
Tramp Specifications ............................................................................................................................................................ 12
Builders Guide General Theory.......................................................................................................................................... 13
Building an Amp –General Guidelines ............................................................................................................................ 13
Introduction...................................................................................................................................................................... 13
Switches and wire ............................................................................................................................................................ 13
Physical layout.................................................................................................................................................................. 13
Grounding......................................................................................................................................................................... 13
Insulated jacks .................................................................................................................................................................. 14
Minimizing transformer interference ........................................................................................................................... 14
Wiring ................................................................................................................................................................................ 14
Assembling the amp ............................................................................................................................................................. 15
Before You Begin ............................................................................................................................................................ 15
Tools .................................................................................................................................................................................. 15
Soldering............................................................................................................................................................................ 15
Tube Pin Numbering ...................................................................................................................................................... 16
Assembly Steps Summary .................................................................................................................................................... 17
Install Tube Sockets and Terminal Strips.................................................................................................................... 18
Heater Wires..................................................................................................................................................................... 18
Install Chassis Hardware ................................................................................................................................................ 20
Install the Transformers ................................................................................................................................................. 21
FOR 120 V OPERATIONS: ........................................................................................................................................ 22
FOR 240 V OPERATION: .......................................................................................................................................... 23
Wire Up the Transformers............................................................................................................................................. 24
Connecting the Impedance Selector ............................................................................................................................ 26
Output Jacks..................................................................................................................................................................... 28
Output Transformer Primary Connections ................................................................................................................ 29
Eyelet Board Construction ............................................................................................................................................ 30
Assemble Volume and Bass Pull Switches.................................................................................................................. 33
Input Jack.......................................................................................................................................................................... 34
Install VRM ...................................................................................................................................................................... 34
............................................................................................................................................................................................ 35
Install Eyelet Board......................................................................................................................................................... 35
Connecting the Board........................................................................................................................................................... 36
General Wiring................................................................................................................................................................. 36
Bias Switch Wiring .......................................................................................................................................................... 36
Preparing Shielded Cable ............................................................................................................................................... 37

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Tramp Grounding Scheme ............................................................................................................................................ 37
Final checkout........................................................................................................................................................................ 38
Working Inside A Tube Amplifier Safely.................................................................................................................... 40
Making a Voltage Measurement.................................................................................................................................... 40
TUBE BIAS SETTINGS .................................................................................................................................................... 42
POWER TRANSFORMER HOOK-UP ........................................................................................................................ 43
WARNING............................................................................................................................................................................ 46
Trinity Tramp Design Voltages .......................................................................................................................................... 47
Builders Guide General Troubleshooting......................................................................................................................... 48
Squeal................................................................................................................................................................................. 48
Troubleshooting the VRM............................................................................................................................................. 48
VRM Bypass Procedure ................................................................................................................................................. 49
Testing a VRM Installation............................................................................................................................................ 50
Tone Tweaking ...................................................................................................................................................................... 51
ube Substitutions ................................................................................................................................................................... 54
How to read Resistor Color Codes .................................................................................................................................... 56
How to read Capacitor Codes............................................................................................................................................. 57
FAQ......................................................................................................................................................................................... 59
Tramp Bill of Materials (BOM) .......................................................................................................................................... 61

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Introduction
This guide has been prepared for builders of Trinity Amps Kits. It is always being improved
and we would appreciate your feedback and comments to: [email protected]
Accordingly, content and specifications are subject to change without notice.
We do try to make it as accurate as possible, but it is sometimes hard to keep up with the
changes. Therefore, if you do find an error, please let us know about it and we will correct it.
Suggestions are welcome so if you have one, please get in touch with us.
Sources of help.
Forums: Please use the various forums to get help. They are an excellent resource and can be
found at trinityamps.com Fender forum.
The Fender Amp Field Guide is a terrific resource for all amps Fender
Email: We can’t help with every problem but if you can not get your problem resolved, email
us and we’ll do our best to help.
Phone Call: If your problem can’t be solved, email for a phone appointment.
Acknowledgements
Much of the content in this document is original. Rather than reinvent content, some parts are based on content
from other excellent sources and are hereby acknowledged.
R.G. Keen’s site www.geofex.com - Tube Amp FAQ, Tube Amp Debugging
AX84.com site www.AX84.com - Gary Anwyl's P1 construction guide version 1.0
GM Arts website http://users.chariot.net.au/~gmarts/index.html - Guitar Amp Basics
Aron from diystompboxes.com
Parts © Trinity Amps 2005. No part of this document may be copied or reprinted without written permission of
Trinity Amps or contributing authors listed above.
This Manual is intended for the sole personal use of Trinity Amps Tramp Customers.
Any copy or other usage is an infringement of copyright.

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WARNING
Please Read this Information Carefully
The projects described in these pages utilize POTENTIALLY FATAL HIGH VOLTAGES. If you are in any
way unfamiliar with high voltage circuits or are uncomfortable working around high voltages, PLEASE DO NOT
RISK YOUR LIFE BY BUILDING THEM.Seek help from a competent technician before building any
unfamiliar electronics circuit. While efforts are made to ensure accuracy of these circuits, no guarantee is provided,
of any kind!
USE AT YOUR OWN RISK: TRINITY AMPS EXPRESSLY DISCLAIM ALL LIABILITY FOR
INJURY OR PROPERTY DAMAGE RESULTING FROM THIS INFORMATION! ALL
INFORMATION IS PROVIDED 'AS-IS' AND WITHOUT WARRANTY OF ANY KIND.
REMEMBER: NEVER OPERATE YOUR AMP WITHOUT A LOAD. YOU WILL RUIN YOUR
OUTPUT TRASNFORMER!

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Thank You
Thank you for purchasing your kit from Trinity Amps. We truly hope that you have fun
building it. If you have any questions please do not hesitate to contact us by email or on the
forum for help.
We are always looking for Customer feedback. We have checked the build instructions
thoroughly and are confident in our product. However, mistakes do happen so our advice is
to cross-check against the schematic as you connect each wire and part according to the
layout. If you find any inconsistencies, or have any concerns, please let us know. Do not
hesitate to contact us! We want this build to be successful for you and for Trinity Amps!
We’re confident that you will like our product and our support and when you’re completed,
we’d appreciate your comments posted on any of the internet forums such as thegearpage.net,
18watt.com, AX84.com or trinityamps.com
We know you have a choice in suppliers and we do appreciate your confidence and of course
your business.
Sincerely,
Stephen Cohrs,
Trinity Amps
Web site: www.trinityamps.com
email: [e-mail]

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Version Control
Version
Date
Change
1.99
28Sep12
Changed 0.47uf cap from 600V to 100V in BOM
17Jan13
Updated BOM with 0.47uF/0.5uf, 22/20 GA & 530 VCT
1.99
20Aug13
Updated board picture;changed wording around “Connect the first volume control to V2, pin 2…”
1.991
7Feb14
Updated BOM & some assembly notes
1.992
12May14
PAB Mod added in Tweaks
2.0
3Aug14
Added VRM Bypass mod; changed OT impedance switch schematic
2.1
31Jan15
Updated BOM
2.2
31Mar16
Updated underside of board view
2.3
12Jun16
Updated Mains Power wiring to match revised layout
2.4
29Nov16
Updated for IEC Mains socket connection
2.5
9Dec2016
Updated Impedance switch instructions.
2.6
23April 2017
Updated Bill of Materials (BOM)
2.7
29Ju2017
Note to tie off and insulate the unused Yellow wires for a Tube rectifier.
2.8
20Jul17
Added and updated Voltage Chart with 6V6, 6L6 measurements.
2.9
12Oct2017
Updated board layout, BOM (220K CF 1W, added EL34 & PAB mod layouts
3.0
23Nov18
Updated for new Power Transformer Design
3.1
13May19
Updated BOM.
3.2
14Jun19
Corrected OT secondary schematic
3.4
11Jul19
Added Squeal troubleshooting tip
3.5
25Jul19
Added note on installing optional Impedance switch.
3.51
19Sep19
Fixed Board Layout 100K (hankules)
3.52
1Oct19
Corrected B+ test C/R location to C12 / R19 (jmczaja)
3.53
14Feb20
New BOM added
3.54
14May20
Alternate Impedance Switch added.
3.55
13Sep20
Corrected board assembly drawing. (R. Gwynn)
3.6
26Oct20
Updated BOM
21.1
24Feb21``
New Version
21.2
4Mat21
Added tube bias settings table
21.3
14May
Board mod for Head build added
21.4
30May21
Mains Power Connection corrected
21.5
28Jul21
Updated Board assembly drawing and clarified board jumpers (W. Ferrell)
21.6
25Aug
Clarified Output Transformer installation)(Bob S)
21.9
4Dec21
Many Revisions per R. Silverstein review

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About the Tramp
The Tramp began as a low-powered, practice-bedroom amp concept that turned into a full
blown practice-home-studio-gigging amp. Why would we bother? Well, there are lots of 2-tube
amps out there, from the famous Fender Champ to the Epiphone Valve Jr, and many more.
These amps have a sweet vibe but are challenged in what they can do; whether the amount of
break-up they can provide in the case of some amps, or their tonal versatility in the case of
others. The Tramp was designed to address this shortcoming and provide extreme versatility
while still keeping to the format of a two-stage preamp and only two tubes. The Tramp also
features a Master Volume control that doesn't make the tone suck as you turn it down, as well
as a variable power level control, allowing you to have almost any tone right down to bedroom
volume levels you can comfortably talk over.
The Tramp is a brand new design that incorporates extreme, useful flexibility with distinct amp
voices and plenty of features. With a simple pull of a switch, you can go from Tweed to 'Tude;
another pull switch and you can play Fat or Thin. Using the Volume, Master Volume and
Power Level controls along with Bass and Treble, achieves tonal nirvana! The design supports
6V6, 6L6, KT66, EL34, 6CA7 and KT88 power tubes so you can swap the single power tube
for added gigging volume and headroom. Power output is approximately 6W with a 6V6, or
12W with the bigger tubes.
The Tramp is effectively two amps in one, which you can alternate between with the simple
pull of a switch. It was intended to cover all the bases from Clean to Dirty, and all the possible
shades in-between - and it delivers an amazing tonal range in doing so.
In Tweed mode, it's heritage is 3Fx series Tweed Princeton or Champ, with the additional
benefit of Treble-Bass tone controls. Tweed is smooth and creamy with a welcome warmth,
vintage voice but with a little more solidity and clarity. It is full of soul and you can really hear
the Fender heritage. In Tweed mode, the Volume control is usable through its entire travel -
gorgeous cleans around 5/6 on the dial, slight break-up around 7/8, and an amazing humming
drive at 9/10. Everything you want in the classic Tweed amp spectrum, from clean to dirty, is
right here.
In 'Tude mode, the Tramp exceeds what you could traditionally achieve with the simple two-
tube amp format. The sound opens up with an astonishing clarity, and extended range of clean
and distorted sounds. 'Tude glows with all of its harmonic content, and grinds when the guitar
gets wound up.
'Harmonic haze' is what it's all about in the clean parts of 'Tude - gorgeous! Just a little hair on
the tone for presence with all these overtones swirling around it and a nice solid foundation.
Cranked up, it's complex, raw and edgy but still under control, and smooth but in an aggressive
way - there's tone right to the top. Using Fat or Thin settings doesn't matter - it holds together
but in a really primal raw "teeth gritting" way... with a P-90 Les Paul - it rocks in a Neil Young
kind of way... Bass dimed, Bass at zero, it doesn't matter. With big humbuckers driving it, and
the Volume cranked right up, you get modern rock distortion tones. At the same time the
natural tone of the guitar really comes through, and you get a completely different vibe from
this amp between a Strat or an ESP.
With the Volume all the way up Power Level acts like a "presence" control - not in a "top end"
sort of way, but more in a "brings the tone out of the speaker" wider, more comprehensive

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way. Because the tone is fairly compressed with Volume cranked, moving power from 10 to 5
on the power level doesn't really make it much quieter, just darker and warmer, but still with all
the beef.
As you increase the Tramp's Power Level, the tone comes forward with highs and high mids
becoming more prominent. At full power and bass down, you can get a real edgy, ringy,
"transitory" kind of tone, and as you roll the bass up, Neil Young and his very large "tone"
show up. With power level below 5 the tone gets quieter, but it still has all the rage. As an
added bonus, players can switch back and forth from Tweed to 'Tude without having to adjust
the Treble or Bass - the tones just work without having to move a knob... so good news for
those that dream of switching between Tweed/'Tude on a gig - you can just 'Set it and forget
it!'

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Tramp Specifications
1. Controls: Power/Level, Volume, Bass, Treble, Master Volume, 1 input
2. VRM [power scaling] incorporated into design. 'Brown out' the amp.
3. Drive octal tubes with OT & bias resistor changes (6V6, 6L6, KT66, EL34,6CA7 ,KT88)
4. Cathode Bias
5. Solid State rectifier
6. 2 tubes (3 max)
7. 1 additional Noval socket hole punched (power or pre-amp)
8. LED Power Indicator
9. Tweed/'tude push/pull switch on Gain control for clean/dirty preamp
10. Thin/Fat push/pull switch on Bass control
11. Bias resistor switch to accommodate two power tubes
12. One Input jack; Two Output jacks
13. Impedance Selector (4,8,16 ohms)
14. Dual Impedance Heyboer custom Output Transformer - 5K AND 2.5K
Power / Level control –Rotary ON-OFF switch with 1M control for VRM*.
Actions: Off –On (low level is standby. Turning control further effects the VRM control and
the power level of the amp (power scaling).
*VRM–components mounted on eyelet board. MOSFET mounted immediately beside board
& leads soldered in directly.
Volume control –to adjust amount of volume and overdrive. The Tramp able to go from
Clean to Dirty. The Tramp plays like a vintage Tweed Champ/Princeton when in Tweed
mode. When played this way, the Master Volume would be on max, and then the Volume
control becomes the amp's Volume control. Incorporates a push/pull Tweed / 'tude switch
for Clean / Tweed // Dirty / Marshall range
Tone Controls:
Bass –Cut/Boost. Incorporates a push/pull Thin/ Fat switch for enhanced voicing
Treble - Cut/Boost
Master Volume control –overall volume level control.

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Builders Guide General Theory
For a discussion on Guitar Amp Basics and Tube Amp Theory, please refer to our support
page document Builders Guide General Theory
Building an Amp –General Guidelines
Warning: Do not attempt to build a guitar amp unless you know how to work safely
with the dangerous voltages present in a tube amp. These voltages can exceed 700
volts.
Introduction
If you have purchased your Trinity Amp as a kit, this guide will help you build a tube guitar
amplifier. It is oriented towards someone who knows a little about electronics but is new to do-
it-yourself amps. It outlines a simple path to getting a quality amp build.
Switches and wire
Use standard UL approved switches with a 125V/3A rating for the Power and Standby switches.
Use 20 or 22 gauge insulated solid wire with a 600V rating. It is good to get a variety of colors
so you can color code your wiring.
Use 18 Gauge stranded for mains wiring.
Physical layout
Make sure the jacks, sockets and pots mounted along the edge won't interfere with parts
mounted on the underside of the chassis. Imagine how chassis will be mounted in the cabinet
and make sure there is enough clearance for the speaker and mounting brackets. Trinity amp
chassis are laid out with serviceability and neatness in mind.
Grounding
It is recommended that you follow the layout provided with your Trinity Amp. It has been
tested and has proven reliable. If you choose to deviate, consider the following information.
Amps traditionally use the chassis for signal ground. This is not the best choice since it can create
ground loops and bad ground connections may develop over time. It is better to use star
grounding in which all of the local grounds are collected at a single ‘star ground’ point. With star
grounding there is only one connection between the chassis and signal ground.
Here are some rules for laying out a star ground. More information on grounding can be found
in the Tube Amp FAQ and the Tech Info page of Aiken Amplification.

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(1) Connect the power transformer center tap directly to the negative terminal of the first power
supply filter capacitor (cap) then run a separate wire from the negative terminal to the star ground
point.
(2) Collect the ground points of each tube and its associated resistors and capacitors to a local
ground point that is not connected to the chassis. Run one wire to the star ground point from
each collection.
(3) Run exactly one wire from the star ground point to chassis.
(4) Insulate the input and output jacks from the chassis.
The safety ground wire from the mains is separate from the signal ground. Run a wire from the
AC ground to the chassis near where the AC power enters the chassis.
Insulated jacks
To insulate the input and output jacks either use plastic insulated jacks or metal jacks with
insulating washers. Some people prefer the increased durability of metal jacks. Insulating a metal
jack requires a shoulder washer with a 3/8 in. internal hole that fits a ½ in. panel hole.
Minimizing transformer interference
To minimize coupling between the power transformer and output transformer orient them so
their plates are at right angles. If possible, place them at opposite ends of the chassis.
Keep the input stage wiring short and away from the output stages. This minimizes the
possibility of oscillations caused by coupling of the output signal into the input.
Mount the grid resistors as physically close to the grid pins as possible.
Use a twisted pair of wires for the tube filament wiring. Route it away from AC lines and close
to the chassis.
Wiring
The traditional method of constructing amps involved mounting the components on tag board
or fiberboard. This is the technique that is used for Trinity Amplifiers and is the recommended
approach for service and reliability.

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Assembling the amp
Before You Begin
When you first receive your kit, remove all of the parts from the shipping box and place them
on a well-lit, clean surface. Check all of the parts against the parts list and verify that you have
everything before you begin. Contact us at once if you are missing anything, or if something
appears to be damaged.
Tools
To assemble the amp you need:
1. 25 watt pencil tip soldering iron
2. 60/40 rosin core solder .030” dia
3. wire stripper
4. wire cutter
5. needle nose pliers
6. small screwdrivers (Phillips, Standard)
7. multi-meter with minimum 500V range
Use a stand for the soldering iron, a sponge to keep the tip clean, de-soldering wick material and
clip leads. You should also have a multi-meter with at least 500V range, preferably 1000V and
an audible continuity checker. Try to get a multi-meter that measures capacitance. This lets you
verify the value of your components before you install them.
Soldering
Soldering is accomplished by heating the components to be soldered and allowing the molten
solder to flow onto them. Do not try to melt solder on the tip of the iron and transfer it to the
solder joint. It doesn't work.
Follow these steps when soldering:
-Use 60/40 rosin-core solder.
-Keep the tip of the soldering iron clean. If it's dirty, wipe it on a damp sponge to clean
it.
-Set the temperature of your soldering iron to about 700F.
-Melt some solder on the tip of the iron. The molten solder helps to efficiently transfer
heat from the soldering iron to the component leads.
-Make a good mechanical connection first, and then make a good solder joint.
-Heat the leads to be soldered by touching it with the tip of the iron.
-Touch the solder to the leads. The solder should flow onto the leads. Avoid breathing
the fumes.

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-Remove the soldering iron and allow the solder joint to cool.
-Note: Do not apply the tip of the soldering iron to the eyelet board any longer than it
takes for the solder to flow.
The solder joint should be clean and shiny. If it is dull looking it may be a ‘cold solder joint’
which is not a good electrical connection. If a solder joint is suspect, heat it with the iron to
reflow the solder.
Tube Pin Numbering
The pins on a 9-pin tube socket are numbered 1 to 9 in a clockwise direction when viewed from
the bottom. Note that there is a gap between pins 1 and 9.
The pins on an 8-pin tube socket are numbered 1 to 8 in a clockwise direction when viewed
from the bottom. Note that there is a gap between pins 1 and 8.
12AX7
6V6/6L6 etc.
12AX7
6V6
The pins on the potentiometers are numbered 1 to 3 from left to right when the shaft is facing
towards you and the pins are at the top.

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Assembly Steps Summary
1. Install tubes sockets and all terminal strips on the Chassis.
2. Wire up the heater wires tight to chassis corner bend; Wire up the LED pilot light.
3. Install remaining hardware onto chassis except the two pull switches.
4. Wire Mains cord.
5. Install transformers. Wire power transformer; Connect to terminal strip.
6. Attach resistors to Octal / Noval terminal strips.
7. Wire impedance switch; output jacks; output transformer.
8. Assemble the eyelet board; attach connecting wires to top of board.
9. Assemble & install Tweed / Tude pull switch; Fat / Thin pull switch.
10. Wire input jack; install on chassis.
11. Install VRM MOSFET onto chassis.
12. Install the board in the chassis.
13. Connect the 2 high voltage power red leads to board; connect power grounds.
14. Connect the eyelet board wires to: tube sockets, controls, and all jacks.
15. Finish off wiring from sockets to controls (shielded cable and leads) output jacks.
16. Check Wiring.
17. Follow Start-Up procedure.

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Install Tube Sockets and Terminal Strips
Install the sockets onto the chassis using the #4 screws into the threaded holes in the chassis.
Align the sockets so that the Octal (8) pin #1 is oriented toward the lower left, and Noval (9)
Pin #1 is oriented toward the left, when facing the inside of the chassis into which the tubes are
mounted.
Install the 4 terminal strips according to the layout. The LED mounting strip requires #4
nut/bolt and the and power ground requires a #6 nut/bolt
The Octal & Noval terminal strips are held in place with a #4 nut installed on the tube mounting
screws.
Insert the grommets for wire leads passing through the chassis from a choke or output
transformer. Use ½ ” size for the Output Transformer (OT) and ½” for the Power Transformer
(PT).
Heater Wires
It is important to wire the tube filaments carefully. Use the Black-Red 20 gauge pre-twisted
wire to do this. If you need to make up some heater wire, tightly twist two lengths of wire
together. This will help to minimize any hum.
Solder each wire to either side lug of the Power Ground Terminal strip.

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It is imperative that where possible, the signal wires run close to the chassis, while the heater
wires run as far away from the signal wires as possible. Make sure the signal wires hug the
chassis and the heaters have a tight twist on them. For the 12AX7 and power tube, we have
had success running the connection wires as shown in the layout.
Note: Don’t substitute smaller gauge heater wires. The wires need to be big enough to carry
the current back to ground and keep hum low.
Route the twisted pair wire from the Power Ground Terminal strip around the perimeter of
the chassis, following the layout diagram.
One wire comes from the Power Ground Terminal strip to the Octal power tube socket to pin
7, the other wire to Octal power tube socket pin 2. Then these go to the 12AX7 preamp tube,
one wire to both pins 4 and 5 of the preamp tube and the other wire to pin 9. Connect Black
on pin 7 of 6V6 and Orange on pins 2. Complete the 12AX7 using the same process. Black
on pins 4 & 5 tied together and Orange on pins 9. Don’t switch the heater wire polarity.
Once soldered, in place at each tube socket, press it flat, tight against the chassis.
Install the LED Indicator mounting terminal strip if you haven’t already. NOTE –For ease of
construction, align the strip so that the terminal lugs are closest to the chassis.
Install the LED bezel mount from the outside of the chassis, then a nut on the inside.
Using needle nose pliers, carefully bend the LED leads at 90 degrees toward the terminal strip.
Solder one lead to the terminal strip. Solder the 270R resistor to the other lead and then to the
other terminal lug. It doesn’t matter which lead goes to which lug.
Now, use some of the twisted wire to connect the 6.3VAC from the Power Ground Terminal
strip to the Indicator mounting terminal strip.

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Install Chassis Hardware
Install all remaining hardware, grommets, ground lugs and control potentiometers except the
Volume - Tweed / Tude pull switch and the Bass - Fat / Thin pull switch. The solder lugs of
the hardware should face you to make it convenient to connect to them.
Ensure the potentiometers are located in the correct positions according their values and the
layout. Trim the locating tabs on the potentiometers so they don’t damage the front panel. For
the Power switch you may need some washers to locate it so the end of the shaft is even with
the other controls. Also, some push-pull switches require an extra nut to do the same.
When you mount the fuse holder and pots, make sure that they are tight so if they come loose
in the future they can't 'windmill' around. There are locating holes that will fit the lugs on the
control pots to help with this. The pots and input/output jacks must also be tight.
Note: Because of the position and shape of the fuse holder, relative to the terminal strip just
below it (heater wire strip/power ground), it may be easier to install the fuse holder after the
power transformer heater wires are wired up.
Important Note : Trim the locating tab on some control pots so that they don’t push through
into the front panel and damage it.
Mains Ground, power ground and preamp ground lugs need to be very tight to provide good
conductivity, safety and low noise.
The output jacks also depend on a tight mechanical connection for grounding and proper
operation.
Mains Power Connection
Install the Mains IEC Socket with two #4 machine screws.
Attach the ground lug to the chassis immediately beside the socket and ensure it is grounded
well. Tighten as much as possible with the #8 KEPS lock nut.. The #8 hole is on the side
perpendicular to the socket.