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Hi, I wonder if you are succesfull at ch switching between the two input jacks how hard it would be to take say the preamp out jack socket point(on the origional MK1) and change it to a stereo one, providing a post pre-amp loop break point. This could be used not only for line level effects but...

Mark, If you do a Google search for Mesa Lonestar and Heartbreaker schematics then what you will see are two more updated versions of the old MK1 albeit with switching options and all the modern bell and whistles of their later models. There is a ton of options you can use from those schematics...

YLO, The reduction of the shunt resistor after the .005 coupling cap origionally came from Gil Ayan's mod to the MK1 reissue (He used a very low value of 33K ). His mods were all to do with bass reduction and better reverb. There are schematics on the net showing before and after values. If...

Hi, I remenber reading a post over at Harmony Central by I think Jake who was having an overall muddy bass sound. He obtained a mod from Boogie that reduced the bass at the phase splitter stage. It entailed removing the .003uF coupling cap and replacing it with an .001uF cap. He liked the mod...

Hi, On my LSC the second ch is 90% the same as a MK1 reissue, so the drive control switch is the same as plugging yer gat into the low then to the hi gain input. Ch 2 is gainer and but there is no additional tube involved, just extra gain/signal level hitting the tubes a little harder. In fact...

Hi, Question, does the "F series" amps suffer the same thin reverb. If yes! then It's the solid state ccts or reverb tanks or both. If the answer is no! them its the circuit in the Rectoverb. The depth of reverb can usually be increased by making the cap feeding the reverb driver larger in this...