ANK 300B Instructions for use
Interstage Monoblock 300B
SET Amplifier
Construction Manual
Version 3.05, August 2019
1-613-822-7188
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 2
Table of Contents
Section 1 —Introduction ……………………………………………..………………………….…………………… 5
1.1 About ANK Audio Kits ……………………………………………..………………………….…………………… 6
1.2 Basic Operation of the Amplifier ………………………………….…………………..…………… 7
1.3 Schematic ……………………………..…………………………………………………………………………… 9
1.4 Equipment ……………………………..…………………………………………………………………………… 10
1.4.1 Overview of the Kit ……………………………………………………….………….…………… 10
1.5 Tips and Suggestions …………………………………………………….………….…………………………… 10
1.5.1 Soldering …………………………………………………….……….……………………………… 10
1.5.2 Components ……………………….…………………………….……………………………………… 11
1.5.3 Resistor Sizes ……………………………………………….……….………………….………………… 11
1.5.4 Capacitor Manufacturers and Voltage Ratings ………………………………………… 11
1.5.5 Electrolytic Capacitors ………………………………………………………………………………… 11
1.5.6 Diodes ………………………………………….……………………………..………………………………… 12
1.5.7 Hardware/Mechanical ………………………………………………………………………………… 12
1.5.8 Wire Stripping and Tinning …………………………………………………………………… 12
1.5.9 Wire Color ……………………………………………………..……………….……………………… 13
1.5.10 Optional Finishing Touches …………………………..……………….……………………… 13
1.6 Build Process …………………………………………………………………………….…………………..………… 13
1.6.1 Some Good Rules of Thumb for Building Your Amplifier …………………….……… 13
1.6.2 Organization of this Manual …………………………………………………….…..…….…… 14
1.6.3 Electrical Safety Warning …………………………………….………….………..………… 17
Section 2 —Mechanical Assembly ...............................................................................…18
2.1 Overview …………………………………………………………………………………..…..………..…….…… 18
2.2 Installing the Rubber Grommets…………………………………………………………….………..…….…… 19
2.3 Installing the Clamps …………………………………………………………………….……………..…….…… 20
2.4 Installing the Valve Base ……………………………………………………….……………..…….…… 21
2.5 Installing the Ceramic Posts …………………………………………………….………………..…….…… 22
2.6 Installing the IEC Socket and Rocker Switch …………………………..………………..…….…… 23
2.7 Installing the Mills Resistor ……………................………………………………………………….…… 24
2.8 Installing the Hex Standoffs …................................…………....................................…………… 25
Section 3 —Installing the Transformers ...................................................................…27
3.1 Overview ………………………………………………………………………………..…..….………..…….…… 27
3.2 Installing the Mains Transformer ……………………………………..….…..….………..…….…… 28
3.3 Installing the Choke ……………………………………………………………..…….………………..…….…… 33
3.4 Installing the Interstage Transformer …………………………………………………………..…….…… 34
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 3
3.5 Installing the Power Supply Capacitors ……………………………………………………………….…… 35
3.6 Installing the Output Transformer ………………………………………………………..… ….…… 37
Section 4 —Power Supply Wiring ................................................................................…39
4.1 Overview …………………………………………………………………………………..….………..……..…… 39
4.2 Preparing the Chassis Ground ………………………………………………………..….………..……..…… 42
4.3 Wiring the IEC, Rocker Switch and Mains ……………………………..….………..……..…… 45
4.4 Wiring the 8-pin Valve Base ………………………………………………………..….………..……..…… 47
4.5 Wiring the Ceramic Post Resistors and Capacitors ….…………………………..…….…… 48
4.6 Initial Mains Secondary Wiring ……………………………………………………………………..…….… …50
4.7 Wiring the Choke …………………………………………………………………………………..…….… …51
4.8 Additional Capacitor Wiring …………………………………………………………….……….………….. 52
Section 5 —Filament Supply Board Installation ......................................................…54
5.1 Overview …………………………………………………………………………………..….………..……..…… 54
5.2 Parts List …………………………………………………………………………………..….………..……..…… 55
5.3 Installing the Resistors ……………………………………………………………………..….………..……..…… 55
5.4 Installing the Capacitors ………………………………………………………..….………..……..…… 56
5.5 Installing the Bridge Rectifier ………………………………………………………..….………..……..…… 57
5.6 Installing the Regulator ………………………………………………………..….………..………..… 58
Section 6 —Filament Supply Board Interwiring ......................................................…59
6.1 Overview …………………………………………………………………………………..….………………….... 59
Section 7 —Front Insert Plate Wiring ....................................................................… 61
7.1 Overview …………………………………………………………………………………..….…………….….…… 61
7.2 Installing the Valve Bases and the Tag Strip ……………………………………………….….…… 61
7.3 Installing the Resistors ……………………………………………………………….……..….………..….….…… 62
7.4 Installing the Capacitors ………………………………………………….……..….………..….….…… 63
7.5 Additional Wiring ……………………………………………………………………..….………..…. ….…… 64
7.6 Mounting the Front Insert Plate and Further Wiring …………………………………..……… 64
Section 8 —Interstage Transformer Wiring ..............................................................…66
8.1 Overview …………………………………………………………………………………..….………….…….…… 66
Section 9 —Installing and Wiring the Rear Connectors ................ .......................…67
9.1 Overview …………………………………………………………………………………...….………..…….…… 67
9.2 Installing the RCA Input Jack ………………………………………................…...….………..…….…… 67
9.3 Wiring the RCA Input Jack ………………………………………................…..….…..……..…….…… 68
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 4
9.4 Installing the Speaker Posts ……………………......................……………………..….……..…….…… 70
Section 10 —Wiring Check Lists …………………………………........................................... 71
Section 11 —Testing …………………………..............…………………… ………………….. 74
11.1 Overview ..................................................................................................................................... 74
11.2 Installing the Fuse ..................................................................................................................... 75
11.3 Initial Tests ..................................................................................................................................... 76
11.4 First Power-Up ..................................................................................................................................... 77
11.5 Voltage Tests ..................................................................................................................................... 78
11.5.1 HT and 300B Voltages …………..…………………………….……….……….……………………… 79
11.5.2 6SH7 Voltage ……………………….………………..…………….……………….……………………… 80
11.5.3 Power Supply Voltages ……………………………..…….……….………………….………………… 80
11.6 Sound Check ..................................................................................................................................... 81
11.7 Debugging ..................................................................................................................................... 82
Section 12 —Finishing Touches ……………………..………..…………….…………………….…...………… 83
12.1 Installing the Front Faceplate ………..………………………..…………..…………………………………… 83
12.2 Installing the LED ……………………..…………………………..………..…………………………………… 83
12.3 Installing the Chassis Top ………..……………………………...........…………………………………… 83
Section 13 —Final Thoughts ……………………..……………………….…………………….…...………… 84
13.1 Congratulations ……………………..……………………………………..…………………………………… 84
13.2 Cables …………………………………..………………………….…………………………………………….…...………… 84
13.3 Tube Rolling ……………………..………………………….…………………………………………….…...………… 85
13.3.1 5U4G ……………………..…………………..……….……………………..……………………...…………… 85
13.3.2 6SH7 ……………………..…………………..……….……………………..……………………...…………… 85
13.3.3 300B ……………………..…………………………………………………………………….…….…………… 85
13.4 Thanks ……………………..…………………………………………………..……………….………….………………….… 86
Appendix ……………………………………………..……………………………………………………...……….……….…… 87
Resistor Color Code Reference …………………………………………………………………….…..…….…… 88
Mains Wiring for 240V …………………………………………………………………….…..………………….…… 89
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 5
Section 1
Introduction
Thanks for purchasing the ANK Audio Kits Interstage Monoblock 300B SET Amplifier. Our goal is to
provide you with the highest quality kit that you will build from scratch with these instructions.
This is very high end and sophisticated piece of audio equipment that will surely become a showpiece
of your sound system. We're excited that you have chosen to join us in enjoying and appreciating
superb audio and we've created this manual to help guide you through each step of the assembly
process with as much detail and clarity as possible. To facilitate the build process, the manual has
been divided into a number of sections, each focusing on a separate aspect of the system: follow the
sections in order and we guarantee you not only a problem-free experience, but a pleasant time
doing so. If you are new to building kits, or if at any time you feel as though you need help or advice,
feel free to contact us and we will do whatever it takes to get you on the right track.
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 6
1.1 About ANK Audio Kits
Audio Note (UK) started out in the early '90s developing several DIY audio kits while they were
building up their finished product business. DIY Audio has a long history and it was an opportunity
for knowledgeable customers to take advantage of world class designs and components. Audio Note
(UK) was focused on using the very finest materials and components custom-made to their
specifications, across their entire product line —from custom film and electrolytic capacitors to
tantalum resistors, transformers, binding posts, wires, etc. The Kit1 300B Single Ended integrated
amplifier was born during development of the Meishu and it proved to be extremely popular
worldwide. The ANKit business was born!
As the finished product business and dealer network started to flourish, Audio Note (UK) eventually
moved the kit business off into a separate division; thus, in 2004, Audio Note Kits started up and was
supported by a website so that customers not located near Audio Note (UK) dealers could order kits
and have them shipped direct. Kit development continued in earnest during the 2000s with
development assisted by Audio Note (UK) engineering. Audio Note (UK) parts were used throughout
the kits, depending on the various levels and budgets. By 2013, ANK Audio Kits (as it came to be
called) had developed a wide product range covering all areas of two channel audio: a single-ended
300B product line, an EL34 classAB and single-ended product line, digital to analog converters, pre-
amplifiers, Phono stages, and Audio Note (UK) speaker kits. The end result today is that customers
worldwide with DIY skills can now build an entire high end audio system to their liking. With the
introduction of higher levels in 2013 and the release of the Level 5 Mentor Pre-amplifier and the DAC
5.1 Signature, some customers wanted these high end products assembled by a professional builder.
As a result, ANK Audio Kits began offering this service for Level 4 and 5 products so that a significant
investment in a kit could be turned into a work of art! Since ANK Audio Kits was born in 2004, over
2,500 kits have been shipped to customers worldwide. Clearly, there is a real demand for high end
audio kits and ANK Audio Kits has been delivering the goods now for 15 years.
We believe and hope that you will have a great experience building your kit and we look forward to
hearing from you about your experience.
Regards,
Brian Smith —Director ANK Audio Kits
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 7
1.2 Basic Operation of the Amplifier
ANK Audio Kits is proud to present the Interstage Monoblock 300B SET Amplifier. As anyone who has
ever heard the transcendent musicality of a single-ended amplifier will tell you, there is something
very special about the music that flows from (relatively) simple, classic Class A triode circuits.
Perhaps it's the absence of crossover distortion, perhaps it's the gorgeous midband reproduction,
perhaps it's the zero feedback design, perhaps it's the organic (even desirable) expressiveness of the
second harmonic; more likely it's all of this and more.
ANK Audio Kits and SET amplifiers go a long way back, right to the beginning in fact, with our Kit1
300B, which has had successive and successful anniversary editions. It's no surprise then that these
300B single and parallel SET monoblocks are simply awesome! A pair of these power amplifiers are a
perfect mate for the Mentor pre-amplifier and a path to truly exceptional audio enjoyment.
Design Elements
The Interstage Monoblock 300B SET Amplifier is a uniquely different amplifier —it is our highest and
most extreme expression of single-ended amplification, reserved for the true connoisseur audiophile.
The interstage transformer design style is currently used on Audio Note (UK)'s top of the line Ongaku
211 amplifiers. Importantly, rather than an additional tube driver stage, the interstage transformer
takes over this task, for ultimate authority, providing a level of realism and detail that you may not
have experienced and driving the 300B triode in single-ended mode. The triode then drives the
output transformer (OP-300).
Audio Note (UK)'s Peter Qvortrup has underscored the significance of interstage transformers:
"It is becoming increasingly obvious that applying transformers at every stage of an
amplifier yields a great benefit in sound quality, provided of course that the transformer in
question is of an appropriate quality and design. Replacing any coupling capacitors with a
well designed and correctly matched driver or interstage transformer yields an almost
shocking improvement in sound and should be tried to fully understand what a good wide
band transformer has to offer."
It's also interesting to read what Audio Note (UK)'s design engineer Andy Grove has to say about the
theory behind the key concepts of this amplifier:
"I explained in the interstage transformer article about the virtues of transformer coupling
to the output valves, and here the bifilar interstage transformer is used to full advantage.
The extremely high impedance AC load to the 6SH7 means that you get more or less the full
gain of the valve, and the loadline is horizontal, which means because the 6SH7 is so linear
the distortion produced by the driver stage is very low, and predominantly even order. It’s
an innate characteristic that a good triode has a constant mu over a wide range of operating
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 8
conditions, therefore, as has been known for a long time, if a triode is run in constant current
mode (either by active load, or by transformer or choke loading) then the valve is as linear as
it can be. The secondary side of the transformer provides a low impedance path to ground
for grid current."
The amplifier has an ultra sturdy 3mm aluminum chassis, powder coated black with a solid copper
insert plate coated in a high gloss clear coating so that it is protected from scratches and will never
change color. It has a new Mains transformer (T-195) and uses the classic 5U4G(B) rectifier tube and
the latest Mundorf MLytic 4-pole capacitor technology to smooth the AC power —and the DC
filaments and a substantial Choke (CH-170) assure dead quiet operation. Other amplifier features
include the 6SH7 input tube, which was selected by Andy Grove for reasons related to the input
impedance and sensitivity in mating with a pre-amplifier; a large 1:1 interstage transformer bifilar
wound sitting on a very large core for superb bass response; high quality black Teflon 4- and 8-pin
valve bases; and Audio Note (UK) hardwire tag strips.
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 9
1.3 Schematic1
1From time to time revisions and upgrades to products result in circuit changes that are not always reflected
in manuals. If you encounter any issues with how this schematic relates to your build that need clarifying,
contact us at audionotekits@rogers.com.
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 10
1.4 Equipment
Here is the list of equipment that will be required:
Philips screwdriver
A pair of quality wire strippers
A large, organized work area
Soldering iron station with wet sponge
Lead-based solder (4% Silver is recommended)
1.4.1 Overview of the Kit
In your kit you will find a series of kit bags containing all the hardware, wire, and parts for the
associated sections of the amplifier. See the Parts List files on the disk to match up the parts in the
kit bags with the lists. There is also a Master list for the kit.
1.5 Tips and Suggestions
We have learned a lot about kit building over the last decade from our customers and I'd like to share
some tips with you to ensure a successful project. Please read through this section thoroughly, it will
give you a good idea of what's ahead and help ensure your success!
1.5.1 Soldering
We highly recommend using lead-based solder with some silver content2on the build. You should
use lead-free ONLY if you are experienced using it and confident. Lead-free solder requires a higher
melting temperature and thus is more difficult to use. We don’t recommend lead-free solder for first-
time builders.
We suggest that you practice your soldering before starting on the kit. Feel free to request practice
parts with your kit so that you can practice tinning wires and making nice solder joints. The key is a
good soldering station with a sponge, the right temperature, a good size tip, and experience;
remember, tips can wear out so make sure your tip is working. (You can also check out YouTube
videos for soldering lessons and examples.) The solder should flow freely; if it’s forming balls then
there is likely a problem with the tip, the temperature, or (sometimes) the surface. Feel free to
contact us for help!
2For example, WBT-0800.
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 11
1.5.2 Components
Using the Ohm setting on your multimeter is very useful when building a kit. It's a good, practical
way of measuring resistors and continuity and is much easier than reading the color codes on the
side. (With practice, the color codes can also be a good way to determine the resistance, but that
method is better left to experienced builders.)
1.5.3 Resistor Sizes
Resistors today, particularly metal film resistors, are often smaller than you might expect. It used to
be that the difference between a 1/2W and a 1W resistor was obvious: the 1W was considerably
larger. That way of looking at things sometimes now no longer applies. Please be assured that all
resistors supplied with ANK Audio Kits are rated at least per the specified wattage: in some cases, a
higher than specified wattage may be supplied.
1.5.4 Capacitor Manufacturers and Voltage Ratings
Occasionally, depending on parts availability, we may use capacitors from different manufacturers.
These will always be of equal or higher quality! As a result, some of the pictures in the manual may
look a bit different at times. With regard to voltage ratings, normally, the voltage rating of the
supplied capacitors will be exactly what you see on the parts lists. Occasionally, a part may be
supplied with a higher voltage. Think nothing of it!
1.5.5 Electrolytic Capacitors
For those who have not built a piece of electronics before, here is a little lesson on capacitors. There
are basically two types of capacitors that we use in the kits: electrolytic and signal capacitors. Of
these, electrolytic capacitors require special attention. Electrolytic capacitors are “polarized,” which
means they have a POSITIVE (+) and a NEGATIVE (–) lead and typically have values like 100uf 450V,
10uf 160V, or 470uf 35V.
These capacitors need to be installed correctly or else they will possibly
blow up at some point!
Each electrolytic capacitor will have a
wide stripe
on the NEGATIVE side. Always ensure that this
stripe (NEGATIVE) is positioned correctly. There are several keys on a printed circuit board to help
you to know how to position the capacitor:
1. There may be a "+" on the board indicating where to position the POSITIVE lead.
2. The segmented half of the circular stencil on the board shows where to position the NEGATIVE
lead. The unsegmented ('half-moon') part of the circle is where the POSITIVE lead goes.
3. The POSITIVE lead goes to a square solder pad while the NEGATIVE lead goes to a round solder
pad.
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 12
1.5.6 Diodes
When installing diodes note that they are oriented with a stripe —
match the stripe on the diode with
the banding (||) stencil on the board.
1.5.7 Hardware/Mechanical
Not all of us are mechanically oriented. So, the kit is well laid out such that all the hardware is
provided and bagged in individual sections, so things should make sense. Start thinking
mechanically because about a third of the kit is mechanical. The first thing to remember is that good
hardware is beautiful: we use all stainless steel metric hardware in the kits. It truly is a thing of
beauty: don’t rush your hardware! Here are a few helpful things to understand:
We use British metric hardware (M3, M4, M5, screw size 10mm, 15mm, etc..) as opposed to the
American imperial system (5/1000th or 50/1000th, 1 inch, 3/4 inch). Please familiarize
yourself with the hardware in the kit.
The screws will be called M3 or M4, which is the diameter of the shaft. The length of the shaft
will be in millimeters, so you will encounter things like an M4 screw 16mm, a PAN head screw
(which is a round spherical head), or a COUNTERSUNK or FLAT head screw (a screw head that
needs to be flush with a surface —for example, under a transformer). So if you are asked to
use an M3 16mm CSK screw, this is an M3 size (obviously), which is a thinner shaft diameter
than an M4; 16mm is the length of the shaft; and the head type is CSK, which is a countersunk
or flat head screw.
Once you have the screws mastered, look at the matching nuts such as M4 nut or M3 nut and
corresponding washers.
Standoffs are common in the kits (again, they are either M3 or M4 size, with different
lengths). They are typically threaded, so the screw goes into them.
If any of the hardware is confusing or something is not fitting right, please email us.
1.5.8 Wire Stripping and Tinning
When it comes to wires, we typically use 18 gauge (thicker) and 22 gauge in the kits. It's PTFE: Teflon
silver-plated copper wire. Basically this is classed as hook-up wire; we typically twist wire for you
when it needs to be. The other wire we use is called shielded cable, like an AN-A (Audio Note (UK)) for
signals. This is two-conductor wire: one is for the signal and the other (a big ground braid wrapped
around the signal wire) is the shielding, which helps prevent the cable from picking up noise. You
should practice stripping some 18g or 22g wire, and then try tinning this wire; this is the process of
adding solder to the bare wire so that the invisible coating on the wire is burned off. This makes for
easy soldering to a PCB, an RCA connector, or a transformer terminal. So it's a good idea to practice
this a little before starting the kit.
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 13
1.5.9 Wire Color
In the earlier sections of this manual, particularly those sections dealing with the Mains transformer
and Choke wires, the colors of the wires should match the color of the wires in your kit. If they don't,
stage, there may be some differences between the descriptions (or pictures) of the color of wires that
you will connect and the color of the wires supplied with your kit; for example, depending on
inventory, we may supply a Black–Red twisted pair instead of a Green–Red (or vice-versa). Don't
worry! Just be sure to check the wiring diagrams carefully and connect the correct points together
and all will be well!
1.5.10 Optional Finishing Touches
From time to time we get asked about some of the build details of the ANK Finished Products that you
can see in the pictures in the "Assembled Kits Gallery!" (https://ankits.smugmug.com/) on our
website. It's important to understand that these stunningly beautiful products were done by an
accomplished professional builder with decades of experience and that some particulars of the build
may be beyond most of us. However, experienced builders who want to incorporate some of these
finishing touches should feel free to do so. While we don't officially support or supply parts for these
optional enhancements, there's no reason why you couldn't or shouldn't do them if you want to and
feel that you can handle them. Without getting into the details (you're on your own here), what you'll
want to get hold of are: heatshrink (to bundle wires), cable ties (to secure large capacitors), stacked
(male/female) standoffs and cable clamps (to elevate and secure signal cables), and cable sleeving.
You can get some of these from your local hardware store (for example, 1/4" Cable Clamps) and
other, more specialized, parts from online distributors such as Grainger, Digi-Key, Mouser, or Cable
Ties and More. If you do decide to dress your build with some of these, please send us a picture or
two. We'd love to see what you did!
1.6 Build Process
1.6.1 Some Good Rules of Thumb for Building Your Amplifier
Take your time, prepare, and try and work on a small task each time you start to build the kit.
Instead of rushing through another section —use the end of your session to check your work.
Always ask yourself if the step you are performing makes sense.
Have fun with your build and savour the experience. Take the time to do a really good job!
Feel free to contact us via email audionotekits@rogers.com if you have any questions or
suggestions during your build —and feel free to send us pictures, etc. We'd be pleased to give
you tips along the way.
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 14
1.6.2 Organization of this Manual
Building an amplifier takes time and requires attention to detail and concentration. It's not
something that you should rush: take the time, be patient, and give yourself a break when necessary.
To help guide you through the process, we've divided the work into a number of discrete tasks, each
with its own section in the manual. The big picture is simple: we'll begin with the mechanical
assembly and then progress to the wiring. We provide easy to follow, step-by-step assembly and
wiring instructions and we prepare the parts you'll need in 15 separate sections, with all IEC cabling
and twisted wire prepared for you ahead of time, making it easy to work through each build stage.
The result: we hope that your kit is a joy to build!
We've divided the build and the manual into the following sections:
1. Introduction
2. Mechanical Assembly
3. Installing the Transformers
4. Power Supply Wiring
5. Filament Supply Board Installation
6. Filament Supply Board Interwiring
7. Front Insert Plate Wiring
8. Interstage Transformer Wiring
9. Installing and Wiring the Rear Connectors
10. Wiring Check Lists
11. Testing
12. Finishing Touches
13. Final Thoughts
Appendix
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 15
Here's another way of looking at how the manual is organized and how the sections fit into the 'big
picture': the main sections are mapped so that they mirror how the components will be positioned in
the amplifier chassis, top and bottom, as shown below:
Top Side
Bottom Side
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 16
The bottom-side view is used throughout the manual for the point-to-point wiring.
For the most part,
each graphic slide shows only the wiring to be done in that sub-section and —not to have
information overload —may not show wiring previously completed.
The overlaid routing of all the
point-to-point wiring underscores why it's a good to go slowly, think carefully about wire length and
routing, and use like heatshrink and cable ties to keep things neat and tidy, as in the picture below.
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 17
1.6.3 Electrical Safety Warning
Please be aware of proper electrical safety.
There are sufficient voltages in this kit to give you a very nasty and harmful shock, so be careful
when powering on, debugging, and probing around.
precautions necessary when building the kit if you feel unsure about what you are doing at any
stage of the build.
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 18
Section 2
Mechanical Assembly
2.1 Overview
In this section we will prepare the mechanical aspects of the kit, mostly on the underside of the
chassis.
Let's start with the chassis and install the:
rubber grommets
35mm clamps
8-pin valve base
ceramic posts
IEC and Rocker Switch
Mills 40R resistor
Hex standoffs
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 19
2.2 Installing the Rubber Grommets
You'll find 3 large and 4 small grommets in your kit bag.
Install the grommets in chassis.
Be careful not to use a sharp object to push them in –just use
your hands and take your time. (You can push them from the underside of the chassis, if you find
that easier.)
Copyright © 2019 ANK Audio Kits
www.AudioNoteKits.com
Page 20
2.3 Installing the Clamps
Next install the 3 35mm clamps that will hold the power supply capacitors. Position these under
the chassis as shown and secure from the top with the M3 10m black flat or countersunk screws.
Here is the view from the underside of the chassis…
… and the view from the top of the chassis:
Table of contents
Other ANK Amplifier manuals
