Marshall Amp Forum - View Single Post - JMP 2150 pre-amp valves (tubes)

ledfree · 05-13-2008, 03:33 PM

I am thinking about changing the valves in my Marshall JMP 2150 (powercell) 1x12 combo.
For those who maybe not famlier with this amp, it features a post inverter master volume

. In other words. The control panel as two channels with their own volume, 4 inputs ala 1959SLP but with a added master volume and the usual eq controls.
I am thinking of changing the pre-amp valve first, too valves that will not breakup as early as the prescent installed ECC83/12AX7s.
Will this work or make no differance to the gain? I am looking to change it sonicaly to increase the mids and make the highs more sweeter (want for a better word).
Any thoughts?

05-13-2008, 03:33 PM	#1 (permalink)
ledfree Junior Member Join Date: Feb 2008 Location: Some where in Marshall Land Posts: 9	JMP 2150 pre-amp valves (tubes) I am thinking about changing the valves in my Marshall JMP 2150 (powercell) 1x12 combo. For those who maybe not famlier with this amp, it features a post inverter master volume. In other words. The control panel as two channels with their own volume, 4 inputs ala 1959SLP but with a added master volume and the usual eq controls. I am thinking of changing the pre-amp valve first, too valves that will not breakup as early as the prescent installed ECC83/12AX7s. Will this work or make no differance to the gain? I am looking to change it sonicaly to increase the mids and make the highs more sweeter (want for a better word). Any thoughts?