12AX7 – High-Mu Twin Triode - generally used as audio pre-amp, very versatile.
12AT7 – Also a Mu Twin Triode, but intended for radio frequency amps, mixers & oscillators.
5847 – Pentode used mostly in IF amps
https://frank.pocnet.net/sheets/077/5/5847.pdf
https://frank.pocnet.net/sheets/049/1/12AX7A.pdf
https://frank.pocnet.net/sheets/093/1/12AT7.pdf
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