Marshall Vintage modern 1987 preamp

[VintageModern1989]

I've just installed a choke, the amp is dead quiet even with single coil, tighter bass, and better definition . There's just the area between v4 and the PT .5H choke, 5 holes on the chassis, remove the 270ohms 5 watts resistor and solder the two wires of the choke .Done !

Hi, I am new here and I do realize this post is Old but have recently bought one of these amps and though I am not good with amp schematics I have been doing mods on my own equipment for bout 10 years now by following what I find on the net. but could not find the location on the board to place the choke anywhere in my searches...If you could tell me is it R57?. I posted a pic of the board for reference also circled where I believe you are referring to ...Thank you.

Vintage Modern Inside Chassis

VM_chassis_under-cabcb7157306a20ba0e83147defd8248.jpg (1018.26 KiB) Viewed 3334 times

[kot]

The choke goes in place of R82 (270 Ohm, 5W) on Marshall Vintage Modern schematic.

[VintageModern1989]

Thank you Very much for the reply.

[SteveD]

I've just installed a choke, the amp is dead quiet even with single coil, tighter bass, and better definition . There's just the area between v4 and the PT .5H choke, 5 holes on the chassis, remove the 270ohms 5 watts resistor and solder the two wires of the choke .Done !

Hi, I am new here and I do realize this post is Old but have recently bought one of these amps and though I am not good with amp schematics I have been doing mods on my own equipment for bout 10 years now by following what I find on the net. but could not find the location on the board to place the choke anywhere in my searches...If you could tell me is it R57?. I posted a pic of the board for reference also circled where I believe you are referring to ...Thank you.

VM_chassis_under-cabcb7157306a20ba0e83147defd8248.jpg

That's not even R57 that you originally circled?!?

You want the large white block resistor sitting near the HT fuse holder, R82 as Kot said.