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This amp was never fitted with KT66s stock. EL34 (also 6550 in the States) only.kevinantich wrote:My bass player just scored a free jmp mk2 master volume head!!! I am going to help him make sure it is workng correctly and fix it up if needed. Heres what I found odd (Possibly Awesome odd that is), when I asked what power tubes are in it he took a look and said KT66. I didnt think that amps from the mk2 master volume came equipped with kt66s, so I am hoping someone didnt just put them in there in place of the typical el34 or 6550 or whatever came stock on this specific model. Anyone familiar with this era of Marshall? (I am willing to bet a testicle that someone on this forum is)
No, bias settings are different hence the resistor value change on the 6550 export models.LivewireBlanco wrote:I'm pretty sure el34s and 6550s are direct replacements.
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