RM9 won't turn on - switch?

My RM9 won't power up. I pulled the bottom covered and didn't see any mainline fuses. Is the switch the likely culprit?

jderimig07-14-2020 7:54pm

clio09 Details Discussions Posts This discussion Message User 3,363 posts 07-14-2020 at 10:59pm Copy Comment URL Report Comment Edit Delete The 5A fuse does affect the lighting of the filaments. If this fuse is blown the amp will look like it is off. The 1A fuses (one per channel) affect B+ only. If one is blown you will not be able to bias the output tubes for that channel, but you can still balance the drivers. Sounds like you have a MkI and the issue could be the power switch as well, especially if you have the square switch which will fail. The rectangular switches were much more reliable. Check the connections to the switches as well.
clio09 Details Discussions Posts This discussion Message User 3,363 posts 07-15-2020 at 03:06am Copy Comment URL Report Comment Edit Delete We could have sent you one as we have a good stock of replacement parts for the RM-9, 10, and 200, but glad you found a switch(es). In the future if you need replacement parts let us know.