[sdiy] Space Expander 7247 substitute

[anthony]

I was wondering if anyone would have any good ideas about what might work in place of the 7247 in a Fisher Space Expander reverb amp. I have several 12AX7's and 12AU7's and some 12AT7's. I thought I'd start with the AU and then the AT.
I doubt the AX would work as well and I've heard of people replacing them in some guitar amps with AU's to get a more
mellow tone. That seems like a good analogy.
I have a bunch of other twin triodes liek 6BQ7's etc. too.
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