Can I safely use KT88 in my Deliverance 60 ii+
Welcome to the forum!
KT88s and 6550s are virtually interchangeable in this amp, though you’ll probably need to reset the bias.
We used to use KT88s here, but the quality has been all over the place in the past couple of years. As a result, I can’t tell you which we prefer.
You will most likely experience an increase in low end, which isn’t an area that the DII+ needs any help with.
Cheers,
Dave
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