Perfect Analog/digital combination, mixing the best from the Belton BTDR-2H-L digital reverb module, and the classic PT2399. The result is a spectacular spring reverb emulation machine boasts a terrifying 30ms – 150ms of pre-delay, controllable via the Attack knob, for everything from a quick rockabilly slapback to viscous pools of ectoplasmic reverberations.
Before the break out of the FV-1 ICs, the Belton brick was without doubt the ultimate resource to build reverb pedals. During early 2010 we have seen many reverb pedals based on this technology (a Belton brick is basically a group of SMD PT2399 in chain) like Wampler Faux spring reverb, Culture Jam Box of hall, and more. Most of these reverbs were aiming to replicate the spring reverb section of traditional amp, to give you that extra wetness on your tone, but EQD took a totally different approach on designing the Ghost Echo. As for sure you are familiarized with EQD designs these guys are always giving an outside the box perspective to each of their creation, and the Ghost Echo is not an exception. This pedal aims to be a standalone atmospheric machine to create dreamy and haunting textures, instead of just emulating a spring reverb.
The key of this design is how the delay from the pt2399 mixes with the Belton brick. After the first Opamp, the signal splits in two, dry and wet signals. The wet signal goes into the p2399 and connects with the Dwell pot as well. The modulated from the pt2399 hits the Belton brick, creating in this way this deep dreamy atmospheric sound that transports us to an ethereal dimension!
For further analysis on this circuit take a look at this thread on Free Stomp Boxes Forum