Also, if anyone's interested, the octal horizontal output tubes found in 1950s and 40s televisions can often be used in place of a 6V6 or 6F6 if its pin-out is the same (the filament draw will often be more). Of course you'll have to run the plate wire from pin 3 to the cap on top. I don't think anyone's interested in using HOTs for 6V6s, though. Just thought I'd mention it. It'd be dangerous, anyway, with the plate cap on top. I used to make amplifiers with HOTs, though, because they were readily available and very cheap. Can't remember the numbers, but there are some 6 volt ones that'll work like a 6V6, and the 25E5 will work for a 25L6. Both have the same pin-out except for the plate cap on top of the 25E5.
I posted this somewhere else. TV tubes, like Thomas mentioned, are a good place to get octal bases. 6SN7GT and 6SL7GT both have all 8 pins and were common in older TV's. I uses these bases for battery radio to power supply connections.
Norm
:Most tube bases have one or two pins removed. Television tubes of the octal variety are somewhat common, though. They're very cheap, too. You can often get a whole box of television tubes for very cheap on eBay.
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:Also, if anyone's interested, the octal horizontal output tubes found in 1950s and 40s televisions can often be used in place of a 6V6 or 6F6 if its pin-out is the same (the filament draw will often be more). Of course you'll have to run the plate wire from pin 3 to the cap on top. I don't think anyone's interested in using HOTs for 6V6s, though. Just thought I'd mention it. It'd be dangerous, anyway, with the plate cap on top. I used to make amplifiers with HOTs, though, because they were readily available and very cheap. Can't remember the numbers, but there are some 6 volt ones that'll work like a 6V6, and the 25E5 will work for a 25L6. Both have the same pin-out except for the plate cap on top of the 25E5.