Eigenschappen Mosterdcondensatoren (Techniek Radio/TV)

door Armand , 22.12.2012, 09:07 (4356 dagen geleden) @ Ed van der Weele †

Ed,zou het dit kunnen zijn? (parafeed capacitor)

Vriendelijke groeten, Armand

In traditional SET amp, the direct current of output triode (from 30 mA for triode-strapped 6V6 to 250 mA for 6C33C) flows continuously through the primary winding of a transformer. This requires inserting a gap in the transformer core to prevent core saturation by DC current; adding a gap decreases primary inductance and limits bass response; the inductance and bass response can be restored by using a larger transformer than if the DC were not present.

An alternative schematic, parafeed amplifier, solves bandwidth problem by blocking direct current from output transformer (which does not need to be gapped, thus improving its bass response). Power supply is reconfigured into a constant current source, usually with a massive, high-inductance anode choke (gapped inductor), so there is little, if any, gain in cost and weight of magnetic components.