Trinity Amps THOR Manual de usuario

The Trinity Amps

THOR

Amp Builder's Guide

DRAFT VERSION

October 2021, Version 21.3

For the sole personal use of Trinity Amps Customers.

Parts © Trinity Amps 2005 - 2021

www.trinityamps.com

Table of  
Contents  
Table of Contents.................................................................................................................................. 3 
Thank You! ........................................................................................................................................... 5 
Introduction .......................................................................................................................................... 7 
Acknowledgements............................................................................................................................... 7 
WARNING ........................................................................................................................................... 8 
Version Control ..................................................................................................................................... 9 
Builders Guide General Theory ............................................................................................................ 9 
Building an Amp..................................................................................................................................10 
Introduction...................................................................................................................................................................... 13 
Switches and wire............................................................................................................................................................. 13 
Physical layout .................................................................................................................................................................. 13 
Grounding......................................................................................................................................................................... 13 
Insulated jacks .................................................................................................................................................................. 14 
Minimizing transformer interference ........................................................................................................................... 14 
Wiring ................................................................................................................................................................................ 14 
Assembling the amp ............................................................................................................................14 
Before You Begin ............................................................................................................................................................ 14 
Tools .................................................................................................................................................................................. 14 
Soldering............................................................................................................................................................................ 15 
Tube Pin Numbering ...................................................................................................................................................... 15 
Tube Designations........................................................................................................................................................... 16 
Grounding Scheme ................................................................................................................................................. 17 
Assembly Steps Summary ....................................................................................................................19 
1. Install the Hardware .............................................................................................................................................. 20 
Tube Sockets............................................................................................................................................................ 22 
Can Capacitor .......................................................................................................................................................... 22 
Grommets ................................................................................................................................................................ 22 
Front Panel............................................................................................................................................................... 22 
Terminal Strips ........................................................................................................................................................ 22 
Ground Lugs............................................................................................................................................................ 23 
Impedance Switch................................................................................................................................................... 23 
Output Jacks ............................................................................................................................................................ 23 
IEC Mains Socket ................................................................................................................................................... 23 
Fuse Holder.............................................................................................................................................................. 23 
1. Install Transformers .............................................................................................................................................. 24 
2. Heater Wiring ......................................................................................................................................................... 24 
Heater Wires ............................................................................................................................................................ 24 
3........................................................................................................................................................................................... 26 
4. Wire the Power Supply ......................................................................................................................................... 26 
120V MAINS........................................................................................................................................................... 29 
240V MAINS........................................................................................................................................................... 30 
RECTIFIER WIRING (SS/5AR4)..................................................................................................................... 31 
HV WIRING........................................................................................................................................................... 31 
Test the Power Supply ........................................................................................................................................... 33 
5. Assemble the Turret Board .................................................................................................................................. 34 
Install Components on Turret Board .................................................................................................................. 34 
Install the Turret Board ......................................................................................................................................... 37 
6. Connecting the Turret Board............................................................................................................................... 38 
Bias and Power Supply........................................................................................................................................... 38 
.................................................................................................................................................................................... 39 
Pay attention to the orientation of the diode and bas filter capacitors.......................................................... 39 
Tube Sockets............................................................................................................................................................ 40 

 
Trinity Amps THOR Builder’s Guide.  Version 21.1 
Page - 4 
 
Socket Mounted Parts ............................................................................................................................................ 41 
Phase Inverter Socket............................................................................................................................................. 41 
6V6 Power Tube Wiring –Bias Resistor, Screen Resistor ............................................................................. 42 
Connecting Controls - Potentiometers ............................................................................................................... 42 
7. Output –Transformer, Impedance Switch, Jacks............................................................................................ 44 
Output Jacks ............................................................................................................................................................ 46 
8. Input - Jacks and Input Grid Resistors .............................................................................................................. 47 
Input Grid Resistors ............................................................................................................................................... 47 
Input Jacks................................................................................................................................................................ 47 
Preparing Co-Axial Wire........................................................................................................................................ 49 
Final checkout .................................................................................................................................... 50 
Power Up .............................................................................................................................................51 
Working Inside A Tube Amplifier Safely .................................................................................................................... 51 
Unplug....................................................................................................................................................................... 51 
Sit ............................................................................................................................................................................... 51 
Drain.......................................................................................................................................................................... 51 
Test ............................................................................................................................................................................ 51 
Close .......................................................................................................................................................................... 51 
Making a Voltage Measurement.................................................................................................................................... 52 
Trinity Thor Voltage Chart ................................................................................................................. 54 
Trinity Thor Voltage Chart ................................................................................................................. 55 
Read this Information Carefully ........................................................................................................................... 56 
Builders Guide General Troubleshooting ........................................................................................... 56 
Tweaking the Thor Overdrive Intensity and Tone.................................................................................................... 57 
How to read Resistor Color Codes...................................................................................................... 59 
First the code ........................................................................................................................................................... 59 
How to read the Color Code ................................................................................................................................ 59 
How to Read Capacitor Codes ........................................................................................................... 60 
FAQ .................................................................................................................................................... 62 
Cliff Jacks Explained .......................................................................................................................... 65 
THOR Bill of Material (BOM) ........................................................................................................... 66 
THOR Transformer Hook Up Schematics ........................................................................................ 69 
 
 

Thank You!

Thank you for purchasing your kit from Trinity Amps. We truly hope that you enjoy building it. If

you have any questions please do not hesitate to contact us.

We are always looking for feedback form our Customers on our products. We have checked the

build instructions over thoroughly and are confident in our product. However, mistakes do happen

so our advice is that as you connect each wire and part according to the layout, cross-check against

the schematic. 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!

Please check over your parts carefully and the Bill of Materials and notify us of anything that does

not seem correct.

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. You will find some extra business cards in the package.

Please keep one and pass the rest around.

We know you have a choice in suppliers and we do appreciate your business.

Have Fun!!

Cheers,

Stephen Cohrs,

Trinity Amps

Web site: www.trinityamps.com

email: [email protected]

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, AX84.com, the Gear Page etc..

Color assembly pictures and the latest drawings, tips, techniques are all in the Trinity Amps Forum,

in the Resources Forum.

Email: We can’t help with every problem but if you cannot 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.

Thor based on original work by RobRobinette.com

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

www.18watt.com - website for various content and diagrams –Richie TMB

Aron from diystompboxes.com

Parts © Trinity Amps. No part of this document may be copied or reprinted without written

permission of Trinity Amps or contributing authors listed above.

Trinity Amps THOR Builder’s Guide. Version 21.2

Page - 8

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 DISCLAIMS 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!

Trinity Amps THOR Builder’s Guide. Version 21.2

Page - 9

Version Control

Version

Date

Change

21.1

19Sep21

Draft Version

21.2

10Oct21

Reversed OT wires connection to tube sockets

Trinity Amps THOR Builder’s Guide. Version 21.2

Page - 10

Builders Guide General Theory

For a discussion on Guitar Amp Basics and Tube Amp Theory, please refer to our Web-Site

Support Page document Builders Guide General Theory

Marshall High Gain Amps

extracted from www.robinette.com

Introduced in 1974, the "Master Volume Lead" series amps were Marshall's first true high gain

amplifiers. They cascaded the Plexi's bright channel into the normal channel, added a pre-phase

inverter master volume and cold biased "cold clipper" gain stage and tweaked the resulting circuit

for an aggressive but sweet overdrive tone.

The guitar signal enters the High "Lead" Channel input jack. The signal is amplified by the V1B

preamp stage then flows through the Preamp Volume pot to the V1A cold biased "cold clipper"

gain stage which generates asymmetric clipping. The signal then flows through the V2A preamp

then directly through DC coupling (no coupling cap) to the V2B cathode follower which supplies

the tone stack with a low impedance signal to keep the tone stack from loading down the guitar

signal. After the Tone Stack the signal goes through the Master Volume and into the Phase Inverter.

The Phase Inverter creates two mirror image signals that are 180 degrees out of phase to feed to the

Power Tubes.

The "High Sensitivity" or "Lead" Channel has an extra preamp gain stage compared to the Low

Channel. The guitar signal is amplified by V1B (one 12AX7 triode) which has a cool bias from its

2.7k cathode resistor. Its small .68uF bypass cap boosts the gain of mid and high frequencies which

reduces the High Channel's lower frequencies early in the circuit so it can focus on mids and highs

that sound good when later stages push into heavy distortion. The signal then flows through the

Low Channel input jack (where the Low Channel input would start) to the Preamp Volume pot. The

pot's output flows to the V1A "cold clipper" gain stage.

The Cold Clipper

The cold clipper is very important to these Marshall high gain amps' smooth overdrive tone. For

minimum distortion a tube should be biased halfway between cutoff (when all electron flow is

stopped) and saturation (when electron flow is maxed out). A 1.5k cathode resistor for a typical tube

amp 12AX7 triode gain stage is very close to center bias. The cold clipper's very large 10k cathode

resistor sets a cold bias that leaves little room on the shutoff side so the input signal can easily be

clipped when the input signal's negative lobe on the grid reduces electron flow through the tube and

electron flow is shutdown completely. This clipping is asymmetric because there's plenty of room on

the saturation side of the bias point. Asymmetric clipping generates mostly sweet-sounding 2nd

harmonic distortion. The positive, saturation side of the guitar signal lobe isn't distorted and carries

the original musical content.

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