ruffrecords said:You will get plenty of gain from the combination of the input transformer and the EF86. The output stage can therefore concentrate mostly on delivering power rather than gain. So you might like to consider changing the 12AX7 to something like an ECC88 or 12AU7.
Cheers
Ian
Single ended is a topology. The REDD 47 is single ended. I agree I assumed mic pre when all the OP said was preamp. I saw no mention of a triode/pentode switch?volker said:From OP: "single ended amp". I'd assume it is either a guitar or hifi amp, leaning more towards guitar due to the mention of tone and a triode/pentode switch. Also I don't see any indication of an input transformer.
jaidn said:Merlin also says that the EF86 turns easily microphonic due to poor design. Choosing the right resistors could improve the performance of the tube.
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