OT How to use your Guitar tube amp for a DI box using?

[Bluesgeetar]

I was wondering is there a way to use the wire going to the speakers or use the jack for the speakers as a DI input kindof?  Here is what I mean,  I want to use my Fender twin reverb as a Acoustic guitar processor Di boxtype thing.  I want to run the mic input into the Joe Meek British Mic preEQ thing and then out to the Fender for ultimate tube warmth.  The only out put I got is the speaker wires.  Is there a circuit diagram somewhere that shows you how to turn a speaker out jack into a regular out jack.  I want to go like this.  Mic->Joe Meek->Fender amp(old one)->Computer sound card with AD convert.  You see what I am trying to do here?  Use the Fender amp as a premo tube warmth processor before the acoustic signal hits the sound card.  I want to so this without putting the speakers into the equation.  Bypass the speakers all together.

[smoguzbenjamin]

Does your amp have a speaker out jack that bypasses the amp's speakers when there's a jack in there? Because then you could just use a mono jack plug, and use a buffer box to sen the mono signal to both left and right channels.

[Johan]

if you pull out the powertubes so you dont need any dummyload to be quiet, you could take you signal from the Reverb send connector..you wount get any reverb, but at least you can use your amps preamp ( the reverb channel )....
..pulling the powertubes will raise the voltage a little inside the amp, so if the amp is old, you might want to keep an eye on the caps so they dont blow from overvoltage...

Johan

[casey]

you could try this......

http://www.partsexpress.com/pe/pshowdetl.cfm?&PartNumber=019-020&DID=7

or you could get a direct box which will handle it and go direct out
of your amp....