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RE: Mysterious Tubes in 1965 Fender Vibro Champ / Hickok branded?!

Ohhh that's perfect!

Yep, very much a Sylvania. Those are great tubes. Some people knock em for being "standard" but I found them reliable and powerful sounding, but without being harsh. Especially the later runs on this design. This is mostly thanks to a way higher transconductance than what data sheets would have you reasonably expect/assume. The standard value is 1600micromhos, a NOS tube usually reads 1700, and I've seen these read into the 1800-1900 range. And that has a definitive effect on sound.

I found these great for phase inverter duty!
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May your tubes be lively, warm, and long-lasting. Holy be thy heater.

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