I just installed a board in a newer RI w/ FX loop

MacGaden · Post by **MacGaden** » Tue Jul 12, 2005 11:40 am

Check this thread:

http://www.metroamp.com/forum/viewtopic ... sc&start=0

Both SS and tube loop schematics are there. To show where it hooks up I´ll post the whole RI SLP schematic there as well.

Bainzy · Post by **Bainzy** » Sat Oct 01, 2005 12:38 pm

right I've got my effects loop board here from the 2005 I fitted a PTP board to. It has four wires:

Green - wasnt connected to board
Black - wasnt connected to board
Brown - was connected to board
Red - was connected to board

Either the black or green was connected to a lug on the treble pot I think.

George, where shall I reconnect these wires, and which wire does the 47k 10w resistor you mentioned go after?

Bainzy · Post by **Bainzy** » Sat Oct 01, 2005 12:57 pm

Right I've fathomed out looking at the PCB board I took out that the red wire goes to the 10w 47k resistor...

Flames1950 · Post by **Flames1950** » Sat Oct 01, 2005 7:51 pm

Is the effects card PCB screened with the W1, W2, W3, and W4 designations by the wires? The schematic is labelled with W1, etc. and shows about where on the card each wire MIGHT be.

W1 is the wire to the 47K 10W resistor, it looks to be located on the inside edge of the effects card opposite the bypass button. W2 is your ground connection and is in the corner on the inside edge, kind of opposite the send jack.
W4 goes to the treble pot's middle lug, it's in the corner close to the level button, and W3 goes to the coupling cap into the phase inverter (where the wire you have right now from the treble pot's middle lug goes.) It's right next to W4.
Again, this is how the schematic makes it look like the board is laid out -- the amp schematic has a drawing of the board's shape and button/jack layout in the corner.

Bainzy · Post by **Bainzy** » Sun Oct 02, 2005 9:44 am

looking at the silk screening now, in that case it should work out to this:

Green - W2 - ground connection

Black - W4 - goes to the treble pot's middle lug

Brown - W3 - goes to the coupling cap into the phase inverter (where the wire you have right now from the treble pot's middle lug goes.)

Red - W1 - the wire to the 47K 10W resistor and then to _______

...so if W3 and W4 are reinstalled, does that mean the wire from the middle lug of the treble pot that's in there now should be removed?

The 47k resistor is probably a bit too big to leave inbetween a wire and the board, but is it worth building something to mount it on? There's plenty of room in the chassis but is it worth the work?

I think we should work on a diagram that George can include with the metroamp CD, that will have red, green, brown and black circles at the points on a finished PTP 1959slp diagram where W1-4 need to be reconnected.

Flames1950 · Post by **Flames1950** » Sun Oct 02, 2005 10:52 am

So this is what the wiring from the FX card needs to be:

http://storage.msn.com/x1pk64-9H0OKxQ4t ... EXACeAq5gH

Where was the 47K resistor mounted before, to the original main PCB? It taps off the positive terminals of the first screen filter (the one closest to the fron panel, closest to the main board in the group of four cans.)
You will get rid of the current wire from the treble pot middle lug to the .022uF coupling cap -- the FX card and its wiring take its place.[/url]

Flames1950 · Post by **Flames1950** » Sun Oct 02, 2005 10:53 am

I guess I still can't do a direct picture in a post either. Copy that as a link and see the diagram. If it looks correct I can try to mod a Metro layout for the FX card too.

Bainzy · Post by **Bainzy** » Sun Oct 02, 2005 11:07 am

Flames1950 wrote:You will get rid of the current wire from the treble pot middle lug to the .022uF coupling cap -- the FX card and its wiring take its place.

thought so, just wanted to double check.

that diagram's perfect.

Bainzy · Post by **Bainzy** » Sun Oct 02, 2005 11:13 am

am I right in thinking the red wire rejoins here then?

Flames1950 · Post by **Flames1950** » Sun Oct 02, 2005 12:47 pm

No, the red wire needs to go to that 47K 10 watt resistor. You've got the right spot marked for the 47K to branch off of though -- either there or the other end of the wire going to the cap cans.
The 10W resistor has gotta get kinda hot from the power rating. I'm not sure where you've got available to mount it if it was originally on the Marshall PCB.

Bainzy · Post by **Bainzy** » Sun Oct 02, 2005 5:07 pm

yeh that was what i meant, the red wire to the resistor to the red circled spot. tommorrow ill make a diagram for the metroamp CD with instructions for refitting the effects loop.

on the subject of mounting the resistor, theres loads of space free in the marshall chassis, so ill just have to get some board material for it. ive still got the 6 mounting posts/screws that came with the PTP board as I kept the ones that were meant for the PCB board as opposed to replacing them.

Flames1950 · Post by **Flames1950** » Sun Oct 02, 2005 10:59 pm

I already made up some diagrams and e-mailed them to George. You were already on the right track so I didn't post a link here.
I don't know if anywhere still carries a bracket for mounting a resistor like that to a chassis side, but you might look around. Both my old 50's Chevrolets have them mounted on the firewall to cut down the voltage going to the ignition using a bracket. Or bend some metal and make one up, but I'd secure it with a dab of silicone or something just to be sure it didn't go sliding. And shrink-tube the connections so nothing shorts out.

Bainzy · Post by **Bainzy** » Mon Oct 03, 2005 11:02 am

hmm, i was thinking about putting some more switchable mods to this plexi (switching components like between different V2 cathodes etc), so putting more board section for it wouldn't bother me in the slightest as I was planning on doing that anyways. Reckon I could try a switchable preamp filter cap mod?

rockstah · Post by **rockstah** » Tue Dec 27, 2005 1:51 pm

Jennifer58 wrote:It is definatly a good try but i mean come on, it strikes me as being rather a bit sloppy and unprofessional, perhaps a few more hours working at it might help.

well this is the last post of yours before i had to say something - show us your stuff already - and try to add something contructive once in a while will you?

77custom · Post by **77custom** » Thu Mar 02, 2006 7:00 pm

Hi all,

I'm new here!!! Obviously. I was looking for this kind of mod. I just purchased a 2003 1959 Super Lead R.I. Anyhow, Although I really like the sound of it, it is definitely loud. So at first I added a 2203 style master volume to the amp. It was good but, not what I was looking for. So I rewired the amp as a 2 input (hi/lo) 2203. It really sounds great. I now want to install the 2203 board in the amp. You may ask yourself, why not just get a 2203. Well I have a couple of 2204's already. Okay, I'm a bit of a rambler at times. Anyway, I like the cabinet style of the 1959, but I want a souped up 2203 sitting inside it. I would like to keep the loop. I use it with my MXR micro amp for solo work. I was hoping to order the metro amp 2203 board to put in the amp and I will probably need all of your help. Is the 2203 upgrade going to be similar to what George had to do with his R.I. upgrade?

Thanks,

Ed

P.S. sorry if I stole the thread.

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I just installed a board in a newer RI w/ FX loop

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