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

jjss49 Details Discussions Posts This discussion Message User 6,612 posts 07-28-2023 at 01:21am Copy Comment URL Report Comment Edit Delete @yogiboy covered the important points just be careful with the lower gain 5751's -- don't mix them with standard gain 12ax7's, or you may get weird imbalances in the circuitry btw, i have many many nice old stock 12ax7's collected over the decades, feel free to pm me if i can be of help
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