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
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