I have a Pathfinder 10 Bass that I bought several years ago and put in the attic shortly afterwards when I upgraded. Your question inspired me to dig it out to see what I think of it today. This won’t be a very full review because I’ve literally taken five minutes out from work to quickly noodle on it.
Firstly it’s a good looking amp. It doesn’t ‘look’ like a cheap amp. The case is solid wood, it has a proper fabric grill cloth and a nice red metal control panel on the top like the old vintage Vox’s. That said it’s not light. I reckon it weighs as much as my Ampeg Pf-500 amp head.
Control wise you get drive, treble, bass and volume, a bright boost and a headphone socket. There is only one input so no second padded input. I don’t know it your Yammy is passive or active but if its quite a hot active bass you might want to look for an amp with a second padded input. I wouldn’t want to put a hot bass in a Pathfinder. speaker-wise it comes with 2 four inch drivers
As far as sounds go it produces a fairly clean tone at low volume which is perfect for practice. I only put my passive Jazz through it but I couldn’t really get a great deal of tone variations out of it even with the bright boost and cut. I was hoping to be able to get a bit of crunch by manipulating the drive with the volume but at higher volumes the sound just gets nasty and ill-defined.
The most distracting thing about this is that it does indeed have a fairly hollow sound as Paul mentioned, almost like there is a bit of constant reverb dialled in - no doubt due to the open back but it can get a bit annoying (unless you really like hollow reverb Shadows/Beach Boys type sounds).
I would think carefully about buying one. If all you want is a low volume practice amp it will fulfill that brief, but that is all it will ever do. The thing with modern D class amps is that they are fully scalable and sound just as good at any volume. My Ampeg PF-500 could blow the roof off the house if it was fully cranked but I can also turn it down so that it’s whisper quiet, probably quieter than the Pathfinder in fact.
I guess what I am saying is that there is no need to limit your choice of amp just because you want something for quiet practice - budget allowing of course. If budget is critical the Vox is probably a good buy to get you started until you can upgrade… The only other amps I can think of in this sector are things like the Blackstar Fly and although I’ve never played one I’ve heard so many bad things about it that I’m sure the Vox would be a better purchase.