Blueprints/measurements of 20/20

tore00 · August 13, 2015, 05:04:21 AM

Anybody got a tracing or measurements of a 20/20 bass body? I'm thinking of a project based on that bass. Very strange that this bass intrigues me. Probably is my past as a rower that returns.

Basvarken · August 13, 2015, 09:25:40 AM

If you tell me what dimensions you need, I'll measure them up for you. Haven't got any drawings I'm afraid.

tore00 · August 13, 2015, 10:40:49 AM

I need the width at the base and the distance from the top of the horn to the base. Then thickness and neck heel size.
I will also appreciate two side views where there are cavities of which I cannot understand the use. Also location of strap lock on horn is evident but the other one is unclear. Where is battery located?

Thanks

Basvarken · August 13, 2015, 10:48:01 AM

A lot of your questions are answered on Jules Haffegee's most excellent website Flyguitars.

http://www.flyguitars.com/gibson/bass/1987Gibson2020.php

I will measure the 20/20 for you this weekend.

tore00 · August 14, 2015, 07:58:38 AM

Many thanks. I cannot open the wiring page of flying guitar either with my PC and with ipad. I spotted that pic with the side arm open. I understand that is useful to play the bass seated. I was thinking that there was a battery cavity, but I was wrong. And I see that the strap lock is located in the bottom cavity and also there is no cavity for battery. I suppose that the strap pins are Schaller safety lock and that the battery is below the pick guard.
Flyinguitar also mentions that the body is maple. Somewhere I read that it is ash to justify the weight.

Grog · August 15, 2015, 02:43:03 PM

Jule's web page shows it best. Each pickup has it's own circuit in it. A 9 volt battery is just wired in series with them.

Here are a few neck shots showing the truss rod nut & the nut that came with my new neck. The newer Sperzel tuners look like they might fit, even though they look a bit different now.

Aussie Mark · August 16, 2015, 06:54:59 PM

Found it ....

Highlander · August 17, 2015, 12:34:58 AM

Hardly surprising it took you so long to find it as I thought you'd forgotten what one of those looked like...

(ps, not a fan but couldn't resist)

Basvarken · August 17, 2015, 09:52:11 AM

Upper horn to bottom: 485 mm
Lower horn to bottom: 320 mm
Width at bottom: 250 mm
Body thickness: 45 mm

The cavity for the battery is straight behind the bridge.
It has a separate cover which looks like it's part of the entire pickguard. But you only need to need to take out two screws. Not the entire pickguard.

It has normal strap pins. No Straplocks.

Aussie Mark · August 17, 2015, 11:52:34 PM

Quote from: Highlander on August 17, 2015, 12:34:58 AM
Hardly surprising it took you so long to find it as I thought you'd forgotten what one of those looked like...

(ps, not a fan but couldn't resist)

Well played :-)

tore00 · August 18, 2015, 02:20:18 AM

Thanks for the measurements. The body is quite thick. I would have bet that was no more than 35 mm.
I started drawing it. I have a question about tuning pegs: I checked the Sperzel catalogue but I did not find any bass tuner similar to the ones of 20/20. I wonder if the new Bass Locking Tuners will fit

Grog · August 18, 2015, 05:58:05 PM

I'm not 100% sure, but it does look like they fit the same way. They still have the little locating pin that keeps them from turning. I was unaware that I would have to drill the small hole above each tuner hole to accommodate that feature.

http://www.sperzel.com/Catalog/4Catalogue.pdf

tore00 · August 21, 2015, 08:34:09 AM

Thanks for the info. I am now in the process finding out parts. Regarding the wiring looking to various sites (for some reason I am unable to see the schematics in Jules site) I understood that the bass is wired like a Fender Jazz bass, two volumes -one tone, with battery in series with both pickups on the ground side. I see that a capacitor is used for tone control and pots are 25 kOhm for nothing volumes and tone.
Do you have any info on the size of the capacitor?

Dave W · August 21, 2015, 02:55:30 PM

Quote from: tore00 on August 21, 2015, 08:34:09 AM
Thanks for the info. I am now in the process finding out parts. Regarding the wiring looking to various sites (for some reason I am unable to see the schematics in Jules site) I understood that the bass is wired like a Fender Jazz bass, two volumes -one tone, with battery in series with both pickups on the ground side. I see that a capacitor is used for tone control and pots are 25 kOhm for nothing volumes and tone.
Do you have any info on the size of the capacitor?

I can't see the wiring page on Jules' site either. He's registered here as EvilLordJuju -- you might send him a private message and see if he can correct the page or send you a schematic directly.

tore00 · September 07, 2015, 02:42:25 PM

Just today a 20/20 neck landed to my house with two pickups, one Gibson and one EMG. I have Sperzel tuners ans Schaller bridge. I traced the body on paper and have a wood blank ready to be routed.

As soon as I have time I will cut the template and then the body.
I still cannot understand why the 20/20 intrigues me. I think that it is related to my past rower experience or I am surrendering to Dark Side of the Force.