As is well known, tubes require a voltage that a battery-powered effects pedal has not yet been able to handle. Countless inventors have already attempted to address a tube using the less-is-more method. However, this only works to a limited extent, because a tube does not like to play under a tariff and is then stingy with the sound. Their power consumption is far higher than what a battery can withstand for more than a few minutes. And your audience isn't paying for your battery changing skills on stage! For this reason alone, the COOLTRONs are really cool. The COOLTRON circuit is based on two unconventional signal paths: a “servo circuit” that creates the right atmosphere between the plate and the grid in the tube, thus ensuring stable conditions in which the tube can flourish without restriction; and a patented power supply that feeds the tube's heating elements with economical low voltage. As the tube runs on a low flame, so to speak, the anode current is far below the control value. This in turn means that the cathode no longer needs as much heat to supply a sufficient amount of current. This is why the 4 AA batteries in the COOLTRON pedals have a sensational service life of 18 hours! The COOLTRON system guarantees real tube heat at ultra-low voltage and is ideal for guitar effect pedals thanks to its low heating current. Pretty clever, isn't it? But all you really need to worry about is the sound of the COOLTRON series: Simply tubey - no ifs, ands or buts.
Demo by Romeo Foundation (EN)
Demo by KBK1973 (EN)