Should be just fine for tube audio, 15MHz bandwidth is more than enough for very low speed digital as well, although in this instance one channel is a handicap, but you can build a simple multiplexer if you need more channels.. (for PIC micro-controllers, etc.)
Just buy a decent probe for it on eBay and you'll be all set.
More advanced scopes offer multiple channels, more bandwidth and delayed sweep - none of which you probably need. I have a very good Tektronix analog scope at home with a microprocessor controlled interface with lots of bandwidth, delayed sweep and 4 channels. I hardly ever use more than one channel, and I can't even remember the last time I used delayed sweep.
Just buy a decent probe for it on eBay and you'll be all set.
More advanced scopes offer multiple channels, more bandwidth and delayed sweep - none of which you probably need. I have a very good Tektronix analog scope at home with a microprocessor controlled interface with lots of bandwidth, delayed sweep and 4 channels. I hardly ever use more than one channel, and I can't even remember the last time I used delayed sweep.
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