Customer trade, this pre-amp delay has been tested and in perfect working order.
From the manual:
Like all members of the Hughes & Kettner Tube Tools Series, the REPLEX is a thoroughly musical tool for professional musicians. It was made in Germany with a dedication to impeccable workmanship and was designed for absolute stage-worthiness. Featuring an innovative combination of analog tube circuitry and digital effects, the REPLEX captures the advantages of both worlds in a single device. On the one hand, you get the musical expressiveness of authentic tube circuitry and, on the other, leading-edge technology and maximum reliability. REPLEX faithfully replicates the effects of vintage tape echo devices and tube reverb amps. Perhaps the most remarkable feature of the REPLEX is the Vintage Factor knob. Set to the far left position, it generates the standard effect of a digital delay. As you rotate the knob clockwise, the device delivers the sound of vintage echo devices, pumping out complex distortion and frequency modulations with increasing intensity. Two different tape-delay types (single or dual-head), the reverb section, and a true hardwire bypass may all be activated via footswitches.
