2 Questions on tube replacement

I am using an Icon Audio PS-1 MKii phono stage.

My record suddenly stopped making any sound at all. I noticed that one of the three output tubes was not firing, so I am going to try replacing it.

The phono stage takes 3 ECC83/12AX7 tubes.

My two questions are:

1 — Can I substitute ECC803 for the ECC83s?; and

2 — Do I need to switch out all three or only replace all one at a time?

Thanks in advance.

saulh07-27-2023 10:54pm

saulh OP Details Discussions Posts This discussion Message User 56 posts 07-28-2023 at 09:21am Copy Comment URL Report Comment Edit Delete Thanks to both of you. @jjss49 I have enough now, but may reach out when I need the next set!
mesch Details Discussions Posts This discussion Message User 3,523 posts 07-28-2023 at 03:09pm Copy Comment URL Report Comment Edit Delete Wow! Question answered and help provided within 3 posts. I am impressed.
ghdprentice Details Discussions Posts This discussion Message User 7,180 posts 07-28-2023 at 04:19pm Copy Comment URL Report Comment Edit Delete But wait… there still may be someone that adamantly claims something to the contrary.
Post removed Jul 28, 2023
bolong Details Discussions Posts This discussion Message User 636 posts 07-28-2023 at 04:57pm Copy Comment URL Report Comment Edit Delete The 7025’s can be icing on the cake if you can find them. I used to get mine on Ebay. Agree with the comment about the gain on 5751’s being potentially problematic. My previous Muzishare x7 did not like those.