CGS513 Wave Mult
CGS113 Serge Wave Mult, 4U LW Version
Ken Stone’s CGS113 Serge Wave Multipliers PCB matchd with the Loudest Warning 4U panel.
The bundle includes the panel, PCB and Clee bracket (CGS513 PCB replaces CGS113 PCB)
More on the PCB here: https://www.elby-designs.com/webtek/cgs/serge/cgs513/cgs513.htm
More on the panel here: http://www.loudestwarning.co.uk/portfolio/cgs-113-serge-wave-mult/