This has been an absolute dream to own and use, she's in fantastic shape and has only been taken out of the rack 3 times since bought. Everything is tight, all the electric bits are clean, crackle free, and it sounds just like it did when brand new. It's an amazing piece of gear that has become a staple for most studios, as I'm sure you know. Here's the write-up and details from Avalon directly. Let me know if you have any questions! ---- Avalon VT-737sp Channel Strip at a Glance: Class A preamp design with three input selections Opto-compressor with minimum signal path Sweepable EQ and hardwired bypass Class A preamp design with three input selections The VT-737sp has three input selections: First, it features a higher-performance microphone input transformer with 48-volt phantom selection. Second, the VT-737sp offers an instrument DI high-source input with a jack located on front panel. Finally, the VT-737sp includes a balanced line input with discrete high-level Class A circuitry. The Class A preamplifier utilizes two cascaded, dual vacuum tube triodes configured with minimum negative feedback. A high-gain switch boosts the overall gain of the preamplifier. The four high-quality tubes are configured as singled-ended anode coupled followers. Opto-compressor with minimum signal path The VT-737sp's opto-compressor features a minimum signal path design with twin Class A vacuum tube triodes for gain matching. The optical attenuator acts as a simple passive level controller. Full dynamic control from soft compression to hard- knee limiting can be achieved with threshold, ratio-compression, attack and release controls plus gain reduction selection on the large VU meter. Sweepable EQ and hardwired bypass The VT-737sp equalizer utilizes 100% discrete, Class A-high-voltage transistors for optimum sonic performance. The high- and low-frequency bands provide the smooth characteristics of an all passive design, while the dual mid bands include variable frequency and switched Q-width selection. The enhanced range of the VT-737sp's mid bands is extended into the high and low bands by the use of X10 frequency multipliers.