suck ma caaack no cunty for old wanks.
Uhm. That's any decent amp, treble on max, bit of reverb.
It's actually pretty cool, the song. I like it quite a bit. But it's not exactly the sound that studios and bands go on quests to find, is it. Personally, I actually like the production here. Whether it's intentionally super thin or not, not sure, I've heard Varg talk about the dire recording conditions for his albums... anyways this here lacks in body and depth tremendously compared to any metal release, even for black metal, and it's got its sonic charm.
In technical terms, it's not easy to replicate Varg's tone, as much as it might seem to be. Take into consideration that Varg recorded with crap equipment, but the whole production on his albums (excepting the last one, I think) were done by Pytten, who is a pro. That means that Varg used a cheapo guitar with cheapo amp, but the mics weren't exactly garbage and the whole eq/filtering/mix was a very good job.
Despite the raw recordings, Burzum albums don't sound harsh or terrible, neither too trebly nor flat (compare it to the LLN shitty catalogue, for example). They sound quite balanced and your ears won't fatigue on repeated or long hearing sessions.
Hvis lyset tar oss doesn't sound thin at all, it actually sounds great for early 90's black metal standards. That album in particular sounds better than Darkthrone's albums up to TH, it sounds even better than ITNE and it was recorded earlier, with poorer equipment. Compare the drum sound for example. Varg's kit sounds actually better than Fenriz' and even Faust' on ITNE, despite not being quite the drummer himself.
That's what most Burzum and depressive/raw black metal imitators never got; Varg might have been minimalistic in songwriting and gear, but he actually cared enough to make those album sound good, at least good enough to deliver a quality product.
who gives a shit about 'the sound that studios and bands go on quests to find' though? most of the best production jobs are idiosyncratic and serve the specific spirit of the music therein rather than following some studio-driven blueprint of whatever metal is supposed to sound like.
Fans might not give a shit about it, but musicians do for sure. There is a reason why there are respected and prolific producers out there; it's because the guys are good for what they offer and, like it or not, most scenes and innovations in music are also possible due a certain production trick or style.
Think about the 80's, Phil Collins' gated reverb shaped an entire generation, for the better or worse. In metal is the same thing. There were your Tägtgrens, Richardsons, Rasmussens, Burns and Sneaps that dominated certain periods of time in metal production. Today you have Bogren, Madsen and so many others.