How do you test audio amplifier vacuum tubes?

I have an old emerson 1964 phonograph with a vacuum tube amplified stereo unit. I can't tell if the speakers are busted or if the vacuum tubes are worn out. I wanted to test the vacuum tubes, and I have an ohmmeter/voltmeter. There are about 8 or 9 pins on the vacuum tube. I think they are dual triode tubes. I don't know which of those pins to test to see if i can pass current through them.

Does anybody know of any schematics for these tubes? Or maybe you know more about this phonograph? Sound comes from the contact between the needle and the record, but not through the speakers. They do crackle a little if I mess with the volume know or gain setting.

This link is a pdf for the 1968 RCA receiving tube manual, a very valuable source for anyone working on "hollow state technology". The second link is a link to the Tube Data provided for lots of material.

The RCA manuals include tube diagrams and the characteristic voltages for the elements, and which pins are connected to the element involved.

I would ask, and I'm not trying to be insulting, that you check the connections to the speakers as well. I mention this because my Dad and I once spent a whole Saturday testing tubes on my Grandma's TV back when there was a tube checker in every drug store, and they all checked fine. Then I reached under the front and found there was a loose wire, that connected to the speaker, an instant fix.