Originally posted by Laroosco!
I would leave the Clubman alone. If you want a KT66 amp buy a Route 66
Originally posted by heybulldog
MR Roccaforte, any info or thoughts on changing the the ef86 to the original pre amp tube- i forget wich one that was. i know you have worked on clubmans from your past post.
Originally posted by theelectic
The heater currents are almost the same (EL34 1.5A, KT66 1.3A) so that part is fine. Output Z is similar, but that's not super critical so no big deal there. A socket wired for EL34s can accept KT66s. Where you're going to run into problems I think is (1) the cathode resistor is too low, which will cause the KT66s to run too hot, (2) size: KT66s are approx. 3/4" larger in diameter than an EL34, which means you need at least 2-1/4" (and preferably 3") between sockets (center to center).