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Title: HELP!! JTM 50 Mods Post by: 72fetter on April 15, 2008, 10:12:11 PM Okay so I ordered a series of mods on my kit but I cant seem to find any articles on how to actually accomplish them haha.
I need help with installing the external bias mod and i am planning an internal channel jump with a mini toggle to disconnect it. I also am planning a toggle to disconnect my ppi volume mod. also are there any better directions online for putting the kit together? I am currently using the pdf from metro but it applies to the jtm45. thanks guys. p.s. I am waiting ofr my trannies, can i start on the kit and just install them when they get here? Title: Re: HELP!! JTM 50 Mods Post by: 72sg on April 16, 2008, 07:29:55 AM Uhhh ... be careful what you wish for?
Sorry! I'm sure someone will be along shortly. Title: Re: HELP!! JTM 50 Mods Post by: cmoore on April 16, 2008, 09:49:41 AM Hhmmmmm. The toggle switch to disconnect the PPIMV is new to me. I am not any kind of tech, but I don't understand what a toggle switch can do. All of the wires and the dual stack pot are in there. Turn it all the way to the right and it is "off" I thought.
How much further out does the toggle take it, back to the board maybe? I just pulled a PPIMV out of a plexi lead/converted to bass. Maybe with the Mod you are talking about I could have left everything in there? Thank You Title: Re: HELP!! JTM 50 Mods Post by: 72fetter on April 16, 2008, 08:15:01 PM well if anything this will prove if it really is at zero.
but external bias mod....how do i do it? Title: Re: HELP!! JTM 50 Mods Post by: bloodedge on April 18, 2008, 03:14:59 AM well if anything this will prove if it really is at zero. you may check at this picture.but external bias mod....how do i do it? hope it help :), it's a nice mod :P some like to have the 1ohm resistor between pin 1 and 8 too... like on there (http://ceriatone.com/images/layoutPic/marshallLayout/JTM100Ceriatone.jpg) except there is no external reading point. |