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Using my B15N as a preamp to record

Hi, im reviving this old thread to see if i can upgrade my live and recording setup. I have an Ampeg B15N 64´hooked to the original cab and from the 8ohm external speaker from B15N head to an Ampeg SVT 410HE to push it a little bit and i would like to incorporate an Ampeg SVT DI (12AX7 Vacum tube DI) sent to the mixer and finally to the PA or Avid Mbox mini 3. I would like to know if it´s possible to use de ext amp out jack from B15N into The SVT DI box>mixer>PA or Avid Mbox mini 3 or would this harm my gear. Or what would be the best setup trying to keep the signal from the 6SL7 pre tube from the B15N togheter with the 12AX7 tube of the SVTDI box.
On the SVT DI box spec sheet it says mawimum input signal 2.5V RMS, Maximum Bal. out signal 0.5V RMS. I would be greatfull if anyone could help me out as i don´t want to mess up my gear. Thanxs

ps: here in South America we use 220V