Re: KT66 as substitute for KT61
I agree with everybody else. KT66s cost a fortune and there's little point using one. If you have a 6V6, 6L6 or EL33 in the junk box try them. The 6V6 probably won't need any component changes but the EL33 or 6L6 may need the cathode resistor bumped up. If you need to buy a valve, a 6V6 is as cheap as they come and should work fine despite the lower slope.
Check the current after making the substitution.
Paul
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