r/banjo

Just came home with this 1997 Gibson Earl Scruggs Standard today. It’s in excellent or near mint condition and was previously owned by a collector that didn’t play it much. I just set it up and put in spikes at 7 and 9. I am very pleased with the tone. Crisp bell-like highs with rapid decay and plenty of growl and meat at the low end. Feel like I got really lucky finding this instrument. Will be fun to compare to my Crafters of Tennessee Maple Classic which I enjoy as well.

Spent way too long screwing around with my head tension by feel alone. Tighten a lug, tap it, shrug, tighten another.

At some point I got curious whether there was a real formula behind the G#3 tap target everyone talks about.

There is and it comes from circular membrane physics the same math used for drum tuning.

The fundamental frequency of a circular membrane under uniform tension is:

f = (2.4048 / (2π × r)) × √(T / σ)

Where:

• r = radius of the head in meters
• T = radial tension in N/m (what we're solving for)
• σ = surface mass density of the head material in kg/m²
• = first zero of the Bessel function J₀ basically the physics constant that describes how a circular membrane vibrates at its fundamental mode

Rearranging to solve for T:

T = σ × ((f × 2π × r) / 2.4048)²

For a typical medium weight head (0.007" frosted, σ ≈ 0.247 kg/m²), standard 11" pot, targeting G#3:

Convert to lb/in by multiplying by 0.005710: ~8.1 lb/in

Total outward force the head is pulling on your tension hoop: T × π × diameter (in inches) = roughly 280 lbs. That's a lot of load on hardware that's maybe 60 years old.

For DrumDial users the empirical correlation maps as: DrumDial ≈ 81.1 + (T_Nm / 159.2) which gives you ~90 at G#3 on a standard 11" medium head.

That lines up with what most bluegrass setups actually read.

The density value is what changes most between head types. Thin heads like the Remo Ambassador clear come in around 0.176 kg/m², Fiberskyn runs closer to 0.353.

Swap those in and the same frequency target requires meaningfully different physical tension which is why a Fiberskyn head at G#3 will feel completely different under your thumb than a clear head at the same tap note.

Anything below about 4.5 lb/in and your bridge is sinking, tone goes muddy.

Above ~10.5 lb/in on a vintage rim and you're asking for problems.

anyway if you want to just punch in your head size and target note and skip the arithmetic: https://www.gopathtomillions.com/p/banjo-head-tension-calculator.html does all of it

I just recently purchased a new RK-R20 and I noticed a little piece of the finish was missing near the nut and as I took a closer look at the neck, I noticed that there are two hairline cracks around the nut.

I was wondering if this is just a cosmetic issue or if it is a structural issue with the neck? I’ve owned guitars my whole life so I know that sometimes the poly finish can crack, but I was wondering if this is something that I should be concerned about. I had it shipped from Florida to up north where it’s colder so I’m wondering if temperature caused this. It does not appear that the cracks are along with the grain of the wood.

I know temperature changes can affect the finish because the wood moves with temp changes, but I just wanted to know if this is an issue that I should be concerned about. I don’t see any signs that the banjo was dropped or anything like that. If it’s just cosmetic, I don’t mind at all, just looking for some feedback or if this is an issue anyone else has encountered. Thanks!!

I removed and filled the frets and added a scoop. I expected some issues but this one has me a little lost. At the top of the neck, the action is too low. At the bottom, it's too high. Open strings sound clear, but as soon as I fret they're dead and not in tune with what the note should be. All solutions I've considered would improve the action on one part but make it worse on the other. I'm using the gold tone bsm medium strings. There's no bowing and the strings are in tune when played open, just not fretted. I'm not getting issues with buzzing.

Solution 1: Adjusting coordinator rod. Unless I'm missing something, the best adjustment I could get is what you see in the pictures.

Solution 2: Shorter bridge. Would help the top but not the bottom.

Solution 3: Taller nut at the top of the neck.

I'm leaning towards needing a shorter bridge AND the taller nut but I wanted to ask before putting more money and effort into this project. I've been doing research on this for a while and I didn't see anything about dead strings and incorrect fretted notes. It seemed like people didn't really run into this issue, or at least didn't mention it.

Does anybody have experience with this kind of thing? Did I basically just destroy my banjo or is there a fix for this? 😅

got it for $95, no markings besides the star