Adding a balanced XLR OUTPUT to a SS Amp

[aoresteen]

My Fender Frontman 25R project continues.  I need to add a microphone level XLR balanced output to feed it to to the PA mixer board in it's own channel.  My Carvin SS bass amp has such an output that I use all the time.

The signal level from the pre-amp to the power amp I assume is line-level which is too hot to use.  I could use a DI box but I would prefer to just have an XLR socket on the back of the amp and avoid using a microphone. Use would be primarily for live gigs.

Ideas?

TIA!

[Loudthud]

A typical circuit will include a low pass filter to simulate the response of a guitar speaker. If you search here, you can find several.

[J M Fahey]

Yes.
For the full experience, take speaker out signal, which will be about 10V RMS (WAY too high) and attenuate it 100:1 to 100mV using a 2 resistor voltage divider: 100k in series, and 1k to ground, which is perfect to feed it into a mixer Line input (every channel has one), no need to super attenuate it to microphone level (a few mV), nobody does that.

Insert a direct box circuit in the path as suggested earlier.
For example: Hughes and Kettner famous Red Box

Schematic and suggested PCB is widely available.