"This receiver def. does not have a Pre-amp out. "
Unless Bob made two types of mxr-150's, it most certainitly does... look on the back panel and you should see two metal "staple" shunts used to connect the pre-amp out to the 150's main amps. These RCA out/in's would be where you can access the pre-out signal....Ed
ps: look at my sig: that's what I've done with my 150: take the pre-outs from the 150 and connect them to the M1.0t Carver amp.
Family room: 300 disk changer with PS Audio Digital Link III DAC; Technics SL-1100A TT. QED Quenx1 IC's from DAC & TT to Adcom GTP-602 preamp/Tuner. AudioQuest King Cobra IC's from preamp to M1.0t mk-II opt2. QED Silver Spirals 4M wires to EPI 1000’s.
Living room: AudioQuest Black Mamba 8M IC's from family room preamp to Barcus-Berry 2002R Sonic Maximizer to GlowPower Zyxt IC's to Sunfire 300x2 to Nordost 6M bi-source wires to AOS 28" MDF spherical speakers using six 8" woofers and eight 1" dome tweeters symm. arranged around the surface.
SS system: CX-995V DVD to AV-705x 5 channel amp (center/rears) & M1.0t mk-II opt2(fronts).
Garage: TLM-3600 CDP to MXR150 Receiver (pre) to TFM-42 to EPI 400 speakers.