6021 tubes as preamp tubes

[Corbic]

After seeing the new Twin Tube Classic pedal, I started looking into the 6021 tubes. I read that 6021 tubes are basicly super-heavy-duty 12AX7s. Are they usable in a tube amp's preamp without modification? And if so, how would they sound compared to 12AX7s?

 

[the guy who invented fire]

Re: 6021 tubes as preamp tubes

6021's are not plug in replacements for 12AX7's...the bottles are miuch smaller and the pins actually solder into place...there isn't a tube socket sp to speak.