KT77 tubes in a MC275 amp

I have a MC275 and blew a KT88 tube - I also have a MC240 and a bunch of spare KT77 tubes.

Can I use KT77 tubes in my MC275?

dseeker06-10-2023 12:02am

jjss49 Details Discussions Posts This discussion Message User 6,612 posts 06-10-2023 at 06:19am Copy Comment URL Report Comment Edit Delete Can I use KT77 tubes in my MC275? no you cannot... the kt77 will not run correctly and will be destroyed if run in place of the kt88/6550 output tubes, for which the amp was designed... the amp may also be damaged
Post removed Jun 10, 2023
dseeker OP Details Discussions Posts This discussion Message User 2 posts 06-10-2023 at 02:32pm Copy Comment URL Report Comment Edit Delete I spent about an hour reading both of the owner's manuals, and then ran a few searches and couldn't find the answer so I decided to ask here cuz everybody seems very knowledgeable. I appreciate the answers. I guess I just have to wait for the delivery of new kt88 tubes. Thanks everyone!
elliottbnewcombjr Details Discussions Posts This discussion Message User 5,376 posts 06-10-2023 at 09:18pm Copy Comment URL Report Comment Edit Delete IF you like the sound of the new ones (after 60 hours break-in), then it is wise to order a spare set
tonydennison Details Discussions Posts This discussion Message User 408 posts 08-12-2023 at 09:23pm Copy Comment URL Report Comment Edit Delete @dseeker " I also have a MC240 and a bunch of spare KT77 tubes." dseeker, now listen very carefully, this is important. If you have a bunch of spare KT77's you should immediately send them to me for proper disposal. DM me and I will send you a label.