Converting a 9V system to 18V system

Some preamp systems allow for the use of either 9 volts or 18 volts for power. Check the specifications for your preamp to make sure that it is recommended. Some known systems that DO allow for 9 or 18V are: Aguilar OBP2, OBP3; Bartolini NTBT 918, NTMB918, Delano (all); John East (all); ACG (all); Nordstrand … Read more