JTM50 layout

[jesone]

Does anyone have a copy of the MacG JTM 50 layout?

Regards

JohnS

[neikeel]

I waited to see if a MacG layout appeared but...........

There is this one that is quite useful:[url]ttp://www.amparchives.com/album/Marshall/Sche ... _orig.html[/url]

Things to note, the small silver mica bypass cap on the normal channel is not stock, nor is the 100pF cap on the volume pot of the normal channel. I would recommend getting two 32/16uF cans. (or a dual 16 on the inside and a 32 up top). Use 32+16 for mains (a GZ34 does not like 64uF) and 16 for screens and 32 for the PI, then dual 32 on the board. I would also swap the V1 bypass cap for a 25uF or at max 50uF electrolytic, a 250uF is far too flubby in the bottom end.

With a good OT and good guitar this amp is excellent (I have built 2 to this spec one with Metro 784-139 and another with Marstran 784-128)

[jesone]

Many thanks Neil. I've already built the amp some years ago, and there are pictures on this forum somewhere, but I wanted the layout for reference. Thanks for the tweak suggestions too.

John

[pearlrider]

Is this what you are looking for. http://imageshack.us/scaled/thumb/826/vfci.jpg[/img]


This is the one I built. http://imageshack.us/scaled/thumb/163/vpew.jpg[/img] The best sounding amp I've made.