The Danforth Standard Digitrola

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Blog entry by Duckarrowtypes posted 02-15-2010 12:44 AM 4135 reads 2 times favorited 13 comments Add to Favorites Watch

I’ve been working on this sculpture for a while at TechShop and at home. It’s taken a long time but I’m finally finished and wanted to share it with you.

Danforth Standard Digitrola-3

Video of it In Action

Here’s my build-journal of sorts.

I started out with a vague idea of making a digital Victrola. I thought about making an iPod dock attached to an old horn but quickly abandoned the idea for a couple of reasons: it’s been done already (!) and it didn’t satisfy my artistic goal. In a nutshell, my artistic goal was to use this piece as a means for abstracting the listener/viewer from time by creating a whole that shouldn’t-be using parts that could-be.

So, as with any build, I sought out my hardware first. I knew that I would have to design the aesthetics of the chamber around the horn hardware. I dragged my son down to High Point to a swap meet organized by the Carolinas Chapter of the Antique Wireless Association. It was February or March and freezing. Luck provided me with a Magnavox radio-speaker horn in decent physical condition but terrible surface condition. I bought it for $20.

Danforth Standard Digitrola

A quick proof-of-concept set up and I moved on to the next step: refinishing.

I sandblasted the entire horn and cleaned it up all its original paint. It was sad to see the Magnavox logo go but I was happy that it was going to see new life.

The Digitrola Horn (unfinished)

I sent the horn off to Anderson Silver Plating in Indiana. This is a place that specializes in restoring brass instruments so I knew that it would be right up their alley. I elected to have the horn brass-plated on the inside of the bell and lacquered on the back. This isn’t too far distant from the appearance of a period piece, actually. The plating and lacquering process took several months which I used to build the rest of the piece. Lets start with the box.

The box / sound chamber is made of a stunning single piece of Marado (Bolivian Rosewood). This piece is sturdy due to the use of 4/4 stock that I milled down to 3/4”. I made the box using miter joints so that the grain of the wood would flow all the way around seamlessly. This is the same technique that I teach in the Basic Box-Making class at TechShop. For the top I inlaid a solid inch-thick piece of the same Marado for two reasons: to provide a sturdy base for the heavy horn and volume control knob and to provide a solid mounting point for the driver underneath. I didn’t want this piece to reverberate.

Once I discovered the day after building the box that I am DEATHLY allergic to Marado I finished the bottom with home-made walnut molding. Live and learn. It actually looks very attractive and it will darken over time anyway.

Now for the hardware. I decided early on that I wanted the hardware to be very deliberate and ornate. There’s only one thing you can DO on this piece (adjust the volume) so I decided to make the volume knob very weighty and attractive. I have a theory: Quality = Price * Weight. I knew that I had to make the volume knob heavy!

Danforth Standard Digitrola

The knob was turned from a solid 2” diameter slab of brass. I faced the top and bottom and then drilled a hole halfway through the middle. Next I milled a brass rod (about 3/4”) very slightly larger than the hole I drilled in the top and squished the two together permanently in the arbor press. Finally I mounted the entire assembly in the lathe again and cut the knurling. Knurling is hard. The very last step was to polish the top so I used my 3M graded-micron polishing paper and oil to give it a mirror finish.

The volume knob’s post was drilled so that I could slide it over the arbor on a volume potentiometer. I had to mill and tap a hole so that I could secure the knob to the potentiometer. No picture, sorry.

The top is thick enough that I could have just crammed the horn into a hole and had it stand up straight. I didn’t like the transition very much though. I tracked down a cast-brass door knob escutcheon ring at House of Antique Hardware in Oregon. This piece only had a 21/32” collar so I had to expand it to fit my horn. Back to the lathe!

Turning the Brass Escutcheon Ring for the Danforth Standard Digitrola

Turning the Brass Escutcheon Ring for the Danforth Standard Digitrola

The last piece of hardware to make was the brass bushing for the power cable. I made that on the lathe out of a 3/4” piece of brass rod.

Danforth Standard Digitrola-5

Once the box was assembled and fitted I installed the guts: a Gilderfluke SD-25 MP3 playback board / digital amp, driver, and a volume control potentiometer. I created a walnut standoff for the driver and laser-cut a cork gasket to install the driver directly beneath the hole for the horn. The walnut box and gasket ensure that the maximum amount of sound energy is focused out of the horn rather than into the box.

Danforth Standard Digitrola-6

I visited my friend Tom (The Radiomonger) at his workshop hoping to score some vintage fabric-wrapped wire. It used to be that copper wire was insulated with cloth and I think that this is really attractive. I wired all of the audio wiring using this wire but opted to use modern teflon-jacketed (and cloth covered) wire for the power connection.

The Radio Monger's Workshop

So there you have it… The Danforth Standard Digitrola.
Danforth Standard Digitrola

Complete Flickr Set
Now I’m going to make an HDTV. I just ordered the LCD screen. :-D

13 comments so far

View clieb91's profile


4267 posts in 5432 days

#1 posted 02-15-2010 01:26 AM

That is pretty awesome looking and the electronic idea is great. Can’t wait to see the other projects.


-- Chris L. "Don't Dream it, Be it."- (Purveyors of Portable Fun and Fidgets)

View NH_Hermit's profile


394 posts in 4593 days

#2 posted 02-15-2010 02:59 AM

O.K. I’m impressed! A lot!

-- John from Hampstead

View Daren Nelson's profile

Daren Nelson

767 posts in 5402 days

#3 posted 02-15-2010 03:15 AM

Very neat !

View Charles Maxwell's profile

Charles Maxwell

1110 posts in 5304 days

#4 posted 02-15-2010 03:33 PM

The clear gold medal winner! Fantastic piece.

-- Max the "night janitor" at

View Duckarrowtypes's profile


69 posts in 5401 days

#5 posted 02-15-2010 07:45 PM

Wow, thanks for the compliments!

View mcoyfrog's profile


4757 posts in 5091 days

#6 posted 02-15-2010 09:50 PM

MANN thats cool what a journey that was, the end product is so awesome, I need to show my son he will defiantly want to make one with me LOL. Gratz to you on this.

-- Wood and Glass they kick (well you know) Have a great day - Dug

View YorkshireStewart's profile


1130 posts in 5398 days

#7 posted 02-15-2010 10:13 PM

Exquisite! Beautifully understated- it could easily have been overdone with mock period twiddly bits. I love it.

-- Res severa verum gaudium - True pleasure is a serious business.

View PBthecat's profile


53 posts in 4547 days

#8 posted 02-19-2010 08:29 PM

What a great idea and execution. How does it sound?

-- "Every hundred years, all new people"

View fredf's profile


495 posts in 5207 days

#9 posted 02-24-2010 07:26 AM

I’ve got a copper horn that I would like to restore, if I may, how expensive was Anderson Silver Plating????

-- Fred, Springfield, Ma

View a1Jim's profile


118334 posts in 5074 days

#10 posted 02-24-2010 07:28 AM

View JAGWAH's profile


929 posts in 4581 days

#11 posted 02-24-2010 07:55 AM

Even if it didn’t work it would be way cool! Wow a beautiful piece.

-- ~Just A Guy With A Hammer~

View Duckarrowtypes's profile


69 posts in 5401 days

#12 posted 02-24-2010 02:54 PM

Thanks again. How does it sound? Well it sounds pretty good, actually. There isn’t a lot of bass as you can imagine but the horn is a natural amplifier. If I had to attribute a single adjective to its sound it would be “honky.”

View rhonan's profile


9 posts in 2815 days

#13 posted 03-27-2015 09:14 AM

Same here and working with is what I consider my advantage.. trying to get level up and hoping what you did can be my next example. Anyway, can you check the photo, so I can have reference, seems has been deleted.

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