I'd been on the lookout (kinda half heartedly) for a decent tube tester, saw this Jackson with a bunch of tubes on Craigslist and offered $100. The owner didn't know exactly what model it was, so I was glad it ended up being a 648S, which is a bit more desirable, and reliable from what I've read
Looks like I'll be sorting tubes this weekend, hoping for a few gems in there...seems to be a lot of 6XXX based tubes that I'm not familiar with. Gotta find a good data list!
Mark
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