These two amplifiers are single channel tube amplifiers operating in pure class A over the whole range of both power and frequency. The use of high quality components and the high precision assembly, all accomplished by hand, make the ONDA 50 and ONDA 90 unique in their kind, not only giving excellent musical performance, but also total reliability and easy maintenance.
Their cabinet is made in anodized aluminium.
The ONDA amplifiers are manufactured under the most severe Quality Assurance standards (ISO 9001/2008).
Operation in pure class A over the whole power and frequency range
Very moderated use of input/output negative feedback
+ The stabilized anodic voltage enables nominal performance to be achieved independently of the supply voltage, it improves the sound quality because the rest points of the tubes remain rigorously constant, it prevents the input of any mains overvoltage.
+ The stabilized voltage of the preamplifying tube filaments greatly improves the S/N ratio.
Adjustment of the BIAS current
The adjustment is automatically made within ± 0.1% through a special electronic circuit.
This maintains the filaments preheated when the amplifier is turned off, so that maximum performance is achieved without delays; it also reduces the thermal stress of the tubes.
High quality components parts