No problem! Another difference between classical strings and acoustic/electric strings is that tension is how nylon strings sold by tension instead of gauge; the gauges are mostly there for reference.
It’s also common to mix tensions between the basses and trebles or use a string from a different manufacturer or material set. I don’t think this practice is as common with the steel string/electric world.
Other places to check for buzzing include:
The basses on a classical guitar are nylon filaments wrapped in silver or nickel plated copper; the trebles are solid nylon or carbon fiber. The tension and gauge required is drastically different for those strings different because of the materials.
Here’s the gauges for a particular set of classical strings I’ve used in the past:
And you’re right that the G and A, and B and D strings look to be of similar size! But when these strings are put under tension, they reach different pitches.
Yeah, I’ve noticed that a lot of sites are starting to disallow aliasing with email addresses. So annoying.
Happy to share (I don’t get the opportunity very often to just talk about the classical guitar itself!).
You don’t need a tension tool or anything; you’d wind the string like normal up to pitch. If you’re new to restringing them, I’d suggest using a tuner that displays the frequency in hertz so you don’t over-tighten. I eventually got to a point where I can hear/feel when it’s close to pitch.
Some caveats though: Nylon strings stretch. So it typically takes awhile for them to settle and stay in tune. I learned in college that tuning them up a full step would stretch them enough to set overnight as opposed to a week. Also, with high tension strings specifically, you have to wind the string a lot for it to reach the correct tension, so the only tool I’d recommend is a string winder (but definitely not an automatic one).
Because the strings are tied off on both ends, they will slip out if the knots are tied in the wrong direction or without enough wraps on the pegs or the wrong knot on the bridge. At higher tension, they slip with much more gusto.
In my experience, steel/electric strings break more often. I never had classical strings break until I started using a specific brand (Hannabach). Apparently this brand is notorious for shitty D strings, which is exactly which one broke repeatedly for me. Luckily, for most classical sets you can buy individual strings, so for every set I would buy, I’d get a redundant D string - and I would always end up using it. Changed brands and no more broken strings.