Marshall DSL - Line Out?

[jensbrix]

Hi guys, I kinda miss a line out on my DSL, because the one in my Sovtek actually works pretty good and gives good results. Since i NEVER use the reverb footswitch jack, I thought it might be used for it, but look at the Sovtek schematic here:
http://i24.photobucket.com/albums/c42/JaguarNegro/mig_50h.jpg
It seems pretty simple? Would I be able to apply this to my DSL, using the reverb footswitch jack?

 

[jensbrix]

No one able to help?

 

[thrawn86]

We need Lane or Jon or someone similar to comment on this. Stand by, sometimes they aren't around for a few days, but someone will get to it.

 

[jensbrix]

Yeah I hope so, haven't had my soldering iron in my amp for almost a week, I'm getting really impatient haha

 

[JohnH]

That line-out circuit is pretty simple, just tapping from the output tranny via a resistor. The resistor has a high value, so it doesn't change the load significantly. I cant see why there would be any problem with it, but youd have to keep the cab plugged in too.

Some line outs try to shape the tone to emulate a cab tone response, but this one does not.

My opinions only, im not an amp tech.

 

[jensbrix]

That line-out circuit is pretty simple, just tapping from the output tranny via a resistor. The resistor has a high value, so it doesn't change the load significantly. I cant see why there would be any problem with it, but youd have to keep the cab plugged in too.

Some line outs try to shape the tone to emulate a cab tone response, but this one does not.

My opinions only, im not an amp tech.

Exactly, which is why that line out gives good results when i use some cab simulation on my computer. I just want to know if its simple to utilize that unused jack for the line out, and how

 

[Lowlife]

You could get a hotplate instead, that'll save you the trouble of hauling around a big ass cabinet, since it can act as load for your amp...and it comes with a line out.

Admitted, using your soldering iron is probably way cheaper, but then you have to use a cab or dummy load instead.

 

[jensbrix]

Bump

 

[jensbrix]

I tried removing R43 and R44, but it took away the reverb. Those are the only 2 things connected directly to the jack, would i make the amp think there was an "empty" jack if i ran both these components to ground?

Come on guys help me out ...

 

[plexifier]

would i make the amp think there was an "empty" jack if i ran both these components to ground?

No.

I have no DSL mod experience but I've looked at this schematic:
http://www.drtube.com/schematics/marshall/jcm2-62-02.pdf

If the "JS8" jack in the above schematic is for the reverb, the jack is normally open (tip and sleeve not connected). Connecting the R43/R44 intersection to ground will turn off the reverb just like a foot switch would.

In order to use that jack for a DI, it looks like all you have to do is remove the wire from the jack's tip and shrink wrap or tape it.

 

[D-Max]

Why mod the amp?

If you would like a line out as on the Sovtek, an external line out can be easily made (and used on other amps):

With this one you can control the line out level.
Use a 5K or 10K pot.
If the signal is too hot or need a more refined control, insert a series resistor before the pot, something like 47K or so.