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?
adlicn OP Details Discussions Posts This discussion Message User 5 posts 10-25-2005 at 06:37pm Copy Comment URL Report Comment Edit Delete I own Pilot SA232. Thanks
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.
edle Details Discussions Posts This discussion Message User 235 posts 10-26-2005 at 04:09am Copy Comment URL Report Comment Edit Delete WOW !!!!! Pilot SA232 is a super great sounding amp. Please e-mail me when you don't want it !!!!
albertporter Details Discussions Posts This discussion Message User 4,949 posts 10-26-2005 at 04:23am Copy Comment URL Report Comment Edit Delete Oddly enough, the Prompt tube substation handbook says 5AR4 is sub for 5U4G, but not the other way around. For 5AR4, subs listed are GZ34, 52KU, 54KU, GZ30, GZ32, GZ33, GZ34, GZ37, R52, U54 and U77. Still I would try to find an old tube guy that knows this piece and can verify tube subs before proceeding. It would be a shame to ruin it.