Can 5AR4 be replaced by 5U4G or 274B?

My amp is used 5AR4/GZ34,can I replace with 5U4G or 274B ?

adlicn10-25-2005 3:02pm

chriskeating Details Discussions Posts This discussion Message User 189 posts 10-25-2005 at 03:58pm Copy Comment URL Report Comment Edit Delete Often, but not always. Look on Sophia Electric's website and read their qualifications for 274B tube. This might help. What amp do you own?
chriskeating Details Discussions Posts This discussion Message User 189 posts 10-25-2005 at 06:56pm Copy Comment URL Report Comment Edit Delete Sorry, but I'm not familiar with that particular circuit.