7-pin counterparts to standard preamp tubes

[JoeTele]

I've been delving deeper into all things tube and am noticing that that prices on some of the 7-pin "versions" of our favorite preamp tubes are often much cheaper than the 9-pins, including NOS Mullard, etc. Long story short, would 2 mullard 6AV6/EBC91's be equal or near to 1 Mullard ECC83/12AX7 regarding all of the properties that make the 9-pin Mullard so desirable? Any strong cons of going down this road (would all be for personal use/gain so no profit motive, resale value concern, etc).

Thanks as always!

Joe

[Phil_S]

If you can get them, IMO, there is every reason to use them. Just remember that you need twice as many sockets and 0.3A for each tube filament. This means a bigger transformer and a more crowded or larger chassis.