Anyone have photos of RM20/22 insides?

[user 4725]

Hi (newbie here). I am clearing out my MTS stuff and the last amp I have left is an RM20 (it was a combo, then it was cut down to head format).

The amp has had a few PCB mods and it squeals with some medium-gain modules (Plexi, XTC, etc). Can't be normal, so I'd like to compare its internal wiring (which seems a bit messy for a commercial PCB-based amp) to the standard cable routing.

Please let me know if you have some photos I can use to compare.


(Will also ask on the Facebook Group page, so apologies if you read the same thing there.)

 

[user 4725]

Just updating in the hope that it might be useful to people in the future... I've had a photo suppled via the Facebook group. Not my photo, so I can't post it here.

But this is mine as it is now:

I will do some 'chopsticking' to see if I can find out which cable(s) are causing the parasitic oscillation. Will report back on what I find.

There are also some cap upgrades - 3x vintage mustard caps in the preamp and a replacement on the Presence/Density board.

 

[Burlo]

Just updating in the hope that it might be useful to people in the future... I've had a photo suppled via the Facebook group. Not my photo, so I can't post it here.

But this is mine as it is now:

View attachment 243

I will do some 'chopsticking' to see if I can find out which cable(s) are causing the parasitic oscillation. Will report back on what I find.

There are also some cap upgrades - 3x vintage mustard caps in the preamp and a replacement on the Presence/Density board.

This is an RM20. I have some additional close-ups of cable connections as well if needed. Cheers, Paul.

 

[user 4725]

Thanks - at first glance they look the same, but I'll open them up on the big screen tonight and zoom in.