KT77 tubes in a MC275 amp

@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.

IF you like the sound of the new ones (after 60 hours break-in), then it is wise to order a spare set

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!

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

*Sarcasm is the refuge of the weak.*

My question is serious. Will it damage the tubes, or the amp?