Tubes for Amps

[Luke]

@Thomas_Melau

Hi. I’m new to this forum, however, I have been playing the harp for 40+ years, and I’m searching information about tubes in my SJ Cruncher Serial #54.
The tube layout specifies 5U4 6L6 6L6 12AU7 12AU7 and 12AT7 or 12Ax7.
For the configuration I received the last tube is a 12y7.
The question is if all 12a<X/Y/UT> can be swapped without problems for the amp.
Thanks in advance Thomas

Hey Thomas - starting a new thread on your question here, so that it’s more easily searchable for others.

Yes, you can swap out tubes without any problem for the amp.

Harmonica players often swap out the 12AX7 and put in a 12Y7 for lower gain leading to less feedback.

Hope that helps.