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retube a jmp1 please

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12AX7/ECC83 are what you want.


Apparently an earlier post ( there are ALWAYS plent of post/fights to do with the JMP ) quoted info from Marshall which stated one valve controls the overdrive and the other for the clean channels.


With this in mind it might be worth checking out the spec of a few different valves to be able to make a choice of the right valve for the right channel.


I may try this myself shortly in the meantime I've plumped for JJ's

which seem very good.


When I'm a bit more 'flush' I may 'trial & error' a few different valves and post the results.

:) :) :) :) :)

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