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Marshall 1987X Plexi conversion build

Discussion in 'Miscellaneous [BG]' started by Trevorus, Apr 21, 2010.

  1. Trevorus


    Oct 18, 2002
    Urbana, IL
    I had an Epiphone Blues Custom 30 that I traded a modded Valve Junior for, knowing it would be a project for me. I first tried modding it not to sound like trash, and I could only get it to sound like a good blues amp, which I don't play a whole lot. On breakup, it just turned to mush...

    So I decided to gut it. I was going to go with a JTM45, but I wanted something a little more stout and ballsy, so I decided on a 1987x board from MetroAmp. I bought the Marshall replacement board, since I was kind of doing a similar thing, replacing a board in an existing amplifier. It worked out very well for what I needed it to do. There was only a minor hiccup with accidentally putting a 470K resistor where a 470R should have been. There are some things to clean up yet, but it's functional and sounds great.

    I need to order some bigger screen resistors, since the ones I ordered are on the small end of a 5 watt resistor. Luckily I ordered 4 of them, and had ceramic 5w 500r resistors from the guts of the BC30, and I did a parallel of the two 1K's in series with a 500 to get back to my 1K with proper thermal dissipation. I'll likely order proper resistors with some new preamp tubes. Anyone have any recommendations for pre tubes?

    I have a master volume setup for it on the way as well (it's SOOO loud!), and I will also be adding an input link switch, for that bridged input thing that people love on this amp so much. I am going to be ordering some WGS speakers for it once I sell a parts guitar I build to generate some funds for the project. Likely a Reaper and a Green Beret.

    Anyways, here's the pics!







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