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2020 Winter Build Off - 4000LS

ctmullins

Still fueled by beer and coconut
Gold Supporting Member
Apr 18, 2008
16,007
1
31,705
MS Gulf Coast
Disclosures
I'm highly opinionated and extremely self-assured
It’s WBO day!

I’m in again this year, with yet another build inspired by the graceful Rickenbacker 400X basses.

This one will essentially be a 4000 style, single-pickup instrument, with a modernized version of the “Light Show” design that RIC dabbled with in the late 60s. Many people find this design gimmicky and tacky, and are put off by that; however, here in the Deep South I sometimes need a gaudy instrument to play for Mardi Gras and other festive events. :)

While RIC made a decent number of Light Show guitars, they only ever made five Light Show basses, all of them based on their 4005 hollow-body design. I actually don’t like the 4005 shape very much, which is why I’ve chosen to instead use the 4000/1/2/3/4 Rossmeisl shape. Again. My entry in the 2018 WBO was a walnut/maple 4004 variant, and it has since become my favorite bass, due to its combination of looks, ergonomics, and tonal flexibility. Building a single-pickup version of this will obviously be more limited in the available tones, but I’m planning on adding a preamp to help with that.

Anyway, the woods will be:
  • Some leftover walnut for the back of the body (with some striking heartwood/sapwood contrast),
  • Some leftover silver maple for the top of the body (with lots of pinholes and knots, all of which should be removed by the chambering)
  • A maple/walnut/maple/walnut/maple neck blank that I laminated earlier this year
  • A 33” scale Pau Ferro fingerboard sourced from www.lmii.com

4000LS_0395.jpg


The original Light Show instruments used a patterned polycarbonate called Rowlux. The original pattern is apparently no longer available, but I purchased a sheet of the Moire pattern, which looks close enough to my eye. The Rowlux is pretty thin and flexible/floppy, so I also purchased a 3/32” thick sheet of plain clear polycarbonate for additional strength.

4000LS_0397.jpg


Lighting technology from the 1960s was obviously more primitive than what we have today. The originals used small incandescent bulbs mounted on a discrete-component circuit board, powered through a separate multi-pin jack by an external power source. Bulky, hot, and not very reliable! Nowadays, of course, we have LEDs, which cure all of those shortcomings. However, I’m not any good with electronic circuits, so I had to do some research on how they work. Along the way I discovered Akimitsu Sadoi, a “technology artist” based in Brooklyn. He designs entertaining LED circuits, and also sells kits for them on his website, www.theledart.com. His Color Organ Triple Deluxe II kit looks like exactly what I need - Perfect! I can solder, and I can follow instructions, so, with a few extension wires for spacing the LEDs out, this should work!

4000LS_0396.jpg


Disclaimer: I have no idea if this will actually work…..

I should also mention that I am apparently not the first one to have this idea - I discovered that TB member @radapaw did a gorgeous 4001 conversion - pics here: The Rickenbacker Club Part Twelve

Let me leave you with this (the Light Show guitar, as there seem to be no videos of the extremely rare bass version!):
 
Tail piece? People diss the Chinese knockoffs, but it’s a one off, might look cool.

Haven’t decided yet. It will be something high quality though, therefore likely not Chinese. I have on hand:
  • Hipshot KickAss (it works well on my 4004CTM)
  • Hipshot Rickenbacker replacement
  • Schaller roller Tune-O-Matic with matching tailpiece
  • Schaller roller Tune-O-Matic with string-thru body
  • Schaller 3D-8 (hmmm...)
Because the body is relatively compact, I’d like to minimize the bridge footprint in order to maximize the Rowlux surface area.
 
@ctmullins
It’s WBO day!

I should also mention that I am apparently not the first one to have this idea - I discovered that TB member @radapaw did a gorgeous 4001 conversion - pics here: The Rickenbacker Club Part Twelve

Thanks for the kind words! I used the led artists kit as well, I needed to boost the signal from the bass for best results, but I expect with the preamp you'll be alright. I mounted the brain in a pedal and only have lights in the bass, but considering how small the kit was, have thought about remounting it in the body and adding an onboard battery option
 
Gonna be a wicked project!! I remember playing one in a store about 1978 or so... It had the little 'mini' inch-long Christmas light bulbs inside, driven by a color organ... Three channel, I think! Color organs were All The Rage at the time, we all used to buy kits and hook em up to our stereos...
I made a color light organ at crafts class in 1985. I remember listening Deep Purple in my room with just the light organ on. Man, that ligh"show" was rock back then!
 
Even though it’s already the 2nd day of WBO, I still have some design details to work through:
  • Bridge - as mentioned above, undecided. @Gilmourisgod has a good point about the “bling” factor.
  • Body thickness - I obviously need enough room to fit the light circuitry, but that should be easy with the LEDs. I’m thinking I want to leave a generous thickness to the back of the body, for strength and balance reasons. I can do 1.5” thick with the blanks I have, which sounds good to me.
  • Neck beam integrity - how much of the beam do I remove to maintain structural strength, versus removing wood for the circuitry and batteries?
  • Batteries - I’m thinking a standard 18V box for the preamp, and had planned on using a small 12v rechargeable battery pack for the lighting.
  • Pickup - I want something largish and chrome, but I’m not going to fool with the Rube Goldberg RIC bridge pickup contraption. I have on hand a large ChiSonic single coil, a Hammon DarkStar that I could pilfer from another bass, or a Peavey T40 for which I could buy/make a shiny surround. My first inclination is to use the ChiSonic.
  • Number of frets - with no neck pickup, I can put a few extra frets at the top end. I could join the body and the neck at the 20th like the standard design, and overhang two or four more over the body. Or I could join the neck at the 21st fret and go with 22 or 24 total frets. Or some other variation.
 
What happened to all Entwhistle's basses, auctioned off for the estate?

Mostly. Here's an exception in it's 'Place of Pride' in Pete's home studio. Used on all his demos since John gave it to him in the '70s.

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Take that Townshend haters!:laugh:
 

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