Brian May Deacy Amplifier Build Part 3 - Making the Cabinet and Final Assembly
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- Опубліковано 26 чер 2024
- The final part of this three part series on making a replica of Brian May's Deacy amplifier built by John Deacon in the early 1970s covers the design and construction of a replica of the vintage loudspeaker cabinet. I also cover final assembly of the all the component parts. The video has numerous sequences which are listed with time indexes below:
00:00 - Introduction.
00:29 - The physical form of the loudspeaker cabinet.
01:01 - The loudspeaker cabinet front baffle and rear cover.
01:35 - Softwood battens.
01:48 - Computer Aided Design (CAD) work (KAT Deacy).
02:25 - Computer Aided Design (CAD) work (this replica).
03:57 - Chipboard sheet unwrapping and discussion.
04:53 - Planning out the CNC cuts using TurboCAD 2016.
05:23 - Cutting the 1220 x 610 mm chipboard sheet in half.
05:37 - CNC cutting process highlights: softwood battens.
05:58 - CNC cutting process highlights: chipboard cuts.
06:12 - Examining the chipboard panels after CNC cutting.
07:10 - Stainless steel M4 threaded inserts.
07:26 - Corner clamping options.
08:28 - Dry fit clamping test No. 1.
08:49 - The mitre spline rebate routing jig.
10:24 - Veneer introduction.
11:50 - Staining the veneer with Rustins wood dye (light teak colour).
12:57 - Coating the stained veneer with Rustins quick drying varnish (clear matt).
14:26 - Cabinet alignment blocks (DACPABs).
15:10 - Dry fit check using the cabinet panel alignment blocks.
15:44 - Checking mitre fit tolerance, squareness and alignment quality.
16:06 - Band clamp presentation.
16:29 - Reviewing the cabinet after veneering and varnishing.
16:53 - Gluing in the softwood battens.
17:28 - Reviewing the cabinet after installation the softwood battens.
17:43 - Covering the front baffle introduction.
18:19 - Reviewing the covered front baffle.
18:49 - Final assembly - screwing on the front baffle.
19:01 - Installing the ELAC TW4/16 tweeter and ELAC 6RM/186 low frequency driver (woofer).
19:19 - Installing the amplifier printed circuit board (PCB).
19:27 - Reviewing the full installation of all components and PCB anti-vibration mounts.
19:45 - Reviewing the speaker crossover connections.
19:56 - Installing polyester wadding to eliminate low frequency standing waves.
20:07 - Rear cover electrical connections (battery wire terminal posts and 1/4" mono jack socket).
20:21 - Screwing on the rear cover.
20:32 - Attaching the external battery connection lead.
20:39 - Side-by-side comparison with the KAT Deacy amplifier replica.
20:57 - Outro.
Part 1 - Introduction to the Deacy Amplifier
• Brian May Deacy Amplif...
Part 2 - Circuit Board Components Assembly and Discussion
• Brian May Deacy Amplif...
Demonstration
• Brian May Deacy Amplif...
I extend my gratitude to the following people:
- Mark Reynolds for supplying some of the component parts featured in this video and helpful advice.
- Nigel Knight for allowing me to review his design survey of Brian May's original Deacy amplifier and general help and guidance.
- Gonzalo Plaza for guidance on the cabinet making aspects.
Please check out my other UA-cam videos and my website, dsgb.net for more information on Brian May's legendary Deacy amplifier, his famous Red Special guitar and my project to build a replica of that.
#BrianMay #Deacy #Deacyamp #JohnDeacon
Excellent and tidy work as always, Doug! I will surely be referencing back to this if I ever get around to constructing mine. Well done, my friend. Special credit for all the chapter listings!
Thanks brother. 🙏🏻😀 It's good to know the time I spend typing in the chapter titles is appreciated. 👍🏻
Amazing Video Doug 🎉
Thanks Andrek. The work itself plus filming and editing took many weeks of my spare time. I doubt that I'll attempt anything this involved again.
AMAZING! And I love the extremely elegant jig you made for the splines. Bravo!
Thanks for your support and helpful discussions Gonzalo. Unfortunately, making a jig was necessary but the end result justified the means. 👍🏻😀
Really enjoyed this series on the deacy. Love the video
Thanks! I couldn't have wired up the speakers without your helping hands. 😀👍🏻
Amazing work! 👍👍👍
Thank you so much. 😀🙏🏻💜
Beautiful craftmanship as always.
Thanks Brad. The additional pressure of close up, high resolution filming means you can't hide substandard workmanship. It's like having a strict woodwork teacher constantly supervising you! 😮
Wow!! You should consider building these for sale.
Thanks for your kind comments. 🙏🏻😀 Building a replica Deacy amplifier from scratch, even with a circuit board kit is a significant undertaking and I only take on these projects in my spare time as a hobby. Manuel Angelini of Doxy World in France makes the best replica Deacy amplifier currently available for sale, The Supersonic Pro and I could never compete with that.
@@dsgb thank you for sharing doxy world info.
Superb work, as always!
Thanks Mark. Your help and positive comments mean a lot. 👍🏻😀
This is now, and will be in the future a Godsend for people wanting to understand the Deacy Amp! Thanks for all your tireless efforts. 😀👍
Does the Deacy have any overdrive sound without a Treble booster? All the small amps I've made need a Treble booster to make them useable.
Hi. Thanks for your supportive comments. No, the Deacy doesn't have any in built overdrive function. Like most guitar amplifiers, it will require a treble booster or other gain circuit to overdrive the tubes or transistors into distortion.
Hi Doug, what wood filler did you use to fill the gaps between the chipboard and the veneer? Do you have a preferred make/type. Thanks.
No preference Tim. On the Deacy cabinet build I used Ronseal multi-purpose wood filler for general gap filling and smoothing. On my Red Special build, if the zone might need to be drilled or subject to some loading, I used Ronseal High Performance wood filler. This is a two-part catalysed formulation and has a strong odour. Also consider two part epoxy resins (for general filling, not specifically on the Deacy cabinet chipboard) although I seem to experience inconsistent results getting these to set despite careful measuring and mixing. 🤷🏻♂️
@@dsgb thanks. I’ll get some Ronseal and give it a go.
The box cab itself is surprisingly complex to bring together. Admirable though your efforts are, just how necessary is it to go to these lengths? Couldn’t you just use an old 60s/70s speaker cab or will the overall tone not be satisfactory?
A similarly sized speaker cabinet constructed from material of similar density will have similar tonal resonance.
The cabinet is actually very straightforward in its design and construction and typical of budget loudspeaker cabinets of that era.
It is my choice to go to these lengths because for an engineer, there is a certain satisfaction and personal challenge in replicating an object to a high degree of authenticity, not to mention the knowledge gained from stretching oneself to learn new skills.
Knight Audio Technologies have made their Deacy cabinet kit available to buy mail order so you can just get that, apply veneer and glue it together if you wish:
deacyamp.com/products/kat-kit-deacy-amp-cabinet-kit
Hi, is the capacitor between the speakers fitted positive to positive or negative to negative
It is in the positive line by convention.
What is the value and the name of speaker's capacitor?
Plessey 1 microFarad. I show this at time index 04m 57s in the introductory video:
ua-cam.com/video/Bdxc_GIqIfE/v-deo.html
Do you have the plans or a dxf drawing for sale for the cabinet ?
I don't sell plans or make my 3D CAD files available to download if an official product already exists. In this case it does.
You can buy Deacy amplifier cabinet kits from Knight Audio Technologies (KAT) when they are in stock:
deacyamp.com/products/kat-kit-deacy-amp-cabinet-kit
@@dsgb They dont have them anymore. Permanently "sold out"
.
That was the situation when I made my cabinet but Nigel eventually reintroduced them to stock. You could produce your own plans quite easily in Fusion360; the cabinet design is relatively straightforward.
Another option is to find a suitable vintage loudspeaker cabinet from shops or internet auction sites then customise it.
@@dsgb Impossible if I dont have the dimensions.
I mention the key dimensions in this video that you are commenting on starting at time index 00:29. 🤔 That should be more than sufficient for anybody to create working drawings from. 👍🏻