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Short-scale Semi-hollow Bass


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This is my third project and will be my second with good results. My goals: 1) build a bass for recording/learning bass

2) make an instrument with angled set neck 3) spend as little as possible :D

I know people hate poplar, but that's what the body is made of. I got it from Lowes and laminated it. I actually like the grain in the top. It will be stained black, though.

In keeping with goal #3, I'm making a single-coil pickup for it. I already had the wire, and I ripped magnets off the bottom of two cheapo guitar single-coils. I still haven't found suitable polepiece screws though. The pickup will be P90 construction style, though the bobbin is tall like a Strat. I may double the number of windings on it, which might help if I can't find screws that conduct magnetistm well.

The neck will be maple. The fingerboard, headplate and top of the pickup cover will be bloodwood. The scale is 30" cuz I have small hands.

Thanks for looking.

http://s134.photobucket.com/albums/q119/Ge...bass%20project/

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Looking good =D

Keep us up to date (on the construction and the learning)

=)

Hey, thanks. Yes, the learning is coming so fast I think I may explode! I've only had my router a few days. I'm never going back to being router-less. :D

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Wow, I think this build is going to turn out looking really sharp. I like the concept of the short scale semi-hollow bass with a neck angle. And personally I don't think there's anything wrong with poplar. I've got a MIM poplar tele that I like just fine. Heck, Melvyn Hiscock used poplar for a guitar in his book.

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  • 2 weeks later...

Here's a quick update:

The body is assembled and carved, ready for cleaning up.

http://i134.photobucket.com/albums/q119/Ge...ct/100_5140.jpg

http://i134.photobucket.com/albums/q119/Ge...ct/100_5139.jpg

I finished winding the pickup. It measures 12.35k DC resistance--yikes! :D I wound it hot because I wasn't finding polepieces with good magnetic transfer. Well, I doubled the magnets under the bobbin (a total of four cannabalized single coil pickups), and now the polepieces are nice and magnetic. They feel as strong as on a normal pickup. This thing is huge and heavy.

http://i134.photobucket.com/albums/q119/Ge...ct/100_5131.jpg

http://i134.photobucket.com/albums/q119/Ge...ct/100_5130.jpg

I also cut and glued the scarf joint and rough-cut the headstock shape. I ordered a custom truss rod (21.5") from LMI cuz I couldn't find the right length from them or Stewmac. Once that gets here (in a month?), I'll table saw/route the channel and then start carving the neck. I'm really liking the grain of the poplar on the top!

http://i134.photobucket.com/albums/q119/Ge...ct/100_5138.jpg

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Nice job. I personally think poplar is a cool looking wood (if you find a piece with minimal mineral streaks...say that five times fast.) I'm liking the shape, too.

Cool, thanks. I tried to pick the best grain with the two boards I had for the top. It's definitely plain, but has a nice slab-sawn look.

The shape reminds me of a hollowbody PRS. I wasn't thinking of that when I drew it, but now I think it would work well for six-string too, without modification (other than carve/bridge placement).

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  • 4 weeks later...

Here's an update...

My custom truss rod from LMI came, along with some bloodwood. Wow, that stuff is hard and splintery. It's beautiful, though, and the smell reminds me of chocolate.

Since the truss rod arrived, I was able to cut the channel, after which I could start carving the neck.

neck carving:

http://i134.photobucket.com/albums/q119/Ge...orestuff001.jpg

http://i134.photobucket.com/albums/q119/Ge...orestuff002.jpg

headstock:

http://i134.photobucket.com/albums/q119/Ge...orestuff005.jpg

neck carve finished, some sanding done:

http://i134.photobucket.com/albums/q119/Ge...orestuff006.jpg

mock-up of parts:

http://i134.photobucket.com/albums/q119/Ge...orestuff004.jpg

I'm really excited. I can't wait to see the bloodwood fingerboard against the maple neck, with the body stained translucent black. :D

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  • 2 weeks later...

I finished the parts of the pickup. I only need to pot the coil and then the pickup will be complete.

Making the cover:

http://i134.photobucket.com/albums/q119/Ge...t/pickup001.jpg

Cover finish-sanded:

http://i134.photobucket.com/albums/q119/Ge...t/pickup002.jpg

Next to a Strat pickup to give you an idea of the size (it's HUGE):

http://i134.photobucket.com/albums/q119/Ge...t/pickup003.jpg

Parts laid together for looks:

http://i134.photobucket.com/albums/q119/Ge...t/pickup004.jpg

Assembled pickup:

http://i134.photobucket.com/albums/q119/Ge...t/pickup005.jpg

The color of the bloodwood (difficult to capture):

http://i134.photobucket.com/albums/q119/Ge...t/pickup006.jpg

I finally figured out what bloodwood smells like. I make a black raspberry pie every summer... it smells like that baking!

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That's a cool looking bass. I love those kind of F-holes.

How much money did you get the poplar for and how much did you get.

Hey, thanks for checking in. The poplar is from the local Lowe's glitzy appliance and garden plant--er--hardware store. I don't think it was more than $20 total. The body is laminated from 6 pieces. Basically I glued the halves first so that I had three "layers" that were the full width and length of the body. Then I did the routing for each layer. For the back, this meant routing away about half of its thickness. For the middle section, I routed around the area that would be hollow and then cut that out with a jigsaw. I glued the back and middle together and then cut out the body outline.

For the top section, I cut out the body outline (leaving 1/4"-1/8" extra). Then I carved it and routed away some on the underside. Then I glued the top and body together and cut the top down to match the curves of the body with a chisel. :D Yeah, that was stupid. But I don't have a bandsaw, so my options are limited.

I just cut the first octave of fret slots.

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TOE-SHOT!!!

Do I win a prize?

Ha ha, yeah, the little guys crept into the picture again. :D

Right now my closest thing to a bass amp is a homebuilt thing. It's a Plexi preamp into a single EL84, about 3 audio watts. I can get some good recorded bass tones with it if I tweak the low-mid EQ a little, using the amp's dark channel. I have a friend's Squier P-bass on loan. I've played around with it, I'm fairly familiar with its "tone". I'll soon be building a new amp, a Plexi preamp into a Deluxe Reverb-style poweramp. The dark channel on that amp will have a switch to bring in a more bass-friendly voicing. (it will basically be a guitar amp that consents to doing bass.)

So... I don't have a whole lot to measure this pickup against in terms of tone. The DC resistance is 12k, so it will be high output, probably somewhat lacking in treble. But I like a warm bass tone, so it should be good.

Thanks for the compliments... it means a lot! :D

Edited by Geo
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  • 2 weeks later...

Woohoo, I made a lot of progress. B)

My tuners have 1/2" bushings, so I had to drill 3/8" holes and then add enough 1/2" depth for the bushings. That was a nightmare with my hand-held power drill. :D The bloodwood headplate splintered and came away from the maple. A few fightin' words were uttered, but I was able to glue it back. Using a chisel to keep the depth even, I slowly drilled the half-inch holes.

http://i134.photobucket.com/albums/q119/Ge...progress001.jpg

Here's the pickup hole routed.

http://i134.photobucket.com/albums/q119/Ge...progress006.jpg

The body during staining.

http://i134.photobucket.com/albums/q119/Ge...progress008.jpg

http://i134.photobucket.com/albums/q119/Ge...progress009.jpg

After neck gluing, I put the parts together just to see what it will look like.

http://i134.photobucket.com/albums/q119/Ge...progress010.jpg

http://i134.photobucket.com/albums/q119/Ge...progress011.jpg

Now I'm applying the finish. Yuck, that blue masking tape ruins the aesthetic. :D

http://i134.photobucket.com/albums/q119/Ge...progress012.jpg

http://i134.photobucket.com/albums/q119/Ge...progress013.jpg

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That's a pretty little shorty bass you got there. My only complaint is the black is too dark.. I don't know but to me it just detracts from the beauty of the bass in my eyes. BUT! You have an excellent instrument there, Geo, and you should be extremely proud. Please if you can when you are finished post a sound clip. I'm interested in hearing what it sounds like.

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Thanks for the comments guys. Yeah, I knew from the start that the high frets would be rather pointless. But I really liked how it looked on paper. Since guitar is my main instrument, and this is mostly for "bass range" bass, I don't mind. However, the high range (esp. the G string) has a really interesting tone since the bass is hollow. It has a considerable amount of acoustic volume--more than I expected. (Oh yeah, it's done. :D ) I'll post a link to a soundfile after I record it etc. Warning... I don't have a bass amp. My options are an amp based on a Princeton Reverb, and a 5w Plexi. I played it in church today and the solid-state sound system made it sound pretty darn good.

Pictures... (I'll take a few more when the natural lighting is better.)

http://i134.photobucket.com/albums/q119/Ge...finished003.jpg

http://i134.photobucket.com/albums/q119/Ge...finished002.jpg

http://i134.photobucket.com/albums/q119/Ge...finished001.jpg

Thanks for looking. Any comments welcome... several flaws are visible in the pictures. :D But this project was a huge leap for me. It turned out way better than my first guitar.

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I really like this build, very nicely done. The only thing i'm not sold on is the finish. I'm thinking a glossier finish would look really nice with the black stain.

Yeah, you're right. But I don't have spray equipment and don't plan on buying it. Maybe this finish could be worked up to a gloss, I don't know. It isn't totally dead; in person you can see the light reflect off it.

Here's a sound clip.

http://www.acidplanet.com/artist.asp?songs=590945&T=9237

I didn't tweak any EQ--just the bass straight into the amps.

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Maybe I missed it, but what exactly is the finish? I used about 35 coats (or somewhere thereabouts) of tru oil and used finishing papers to buff it to a pretty high gloss. (Check out my build thread and look at the pickup cover) You could do something like that pretty easily. It would take some time, but no special equipment or skills are necessary.

BTW, I really like the raw sound of the bass. Very nice.

Edited by mattharris75
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Well, I may get scolded... but here's my finish recipe. It's 1 part turpentine, 1 part boiled linseed oil, and 1 part clear gloss miniwax. It's a built-up finish. The neck really feels incredible.

I think this is a pretty non-standard finish. A guy on another forum shared the recipe with me. I would be suspicious, except that he's built quite a few guitars.

I lost track of coats, but I know I didn't do 35. The guy recommended 1 coat a day for 7 days. I think I did more than that, but I didn't count.

Glad you like the tone. I think it sounds fine without EQ, except for the distorted tone, which needs a low boost.

Edited by Geo
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