I found an add for a vintage 8 watt Teisco that goes for super cheap. 250 bucks or so....well....1000 shekels. Should I pull the trigger? Seems like a no brainer.
I'd need to know a little more about it. First off, all tube? Next, WHICH tubes? Many of those amps don't use an input transformer, or at least not for the heaters. You can tell because the heater voltage ratings add up to roughly 100-110 (like the 50C5, 35W4 and 12AX7 of an amp-in-case Danelectro). They are a shock hazard and need to be run on an isolation transformer, an additional cost besides any caps that need replacing.
All that said, it's a $250 amp, not a bargain at that price but a decent small volume amp.