09-02-2013, 11:46 PM
Having used toroids as O/P transformers in PP Audio Amps there is always the problem of keeping the quiescent currents through the two sides of the ouput transformer primary balanced such it does not saturate. This usually entails measuring the Ia (Valve O/P stages) and balancing every 6 months or so. A simple compass on top of the transformer will indicate an imbalance of 1.5 mA on a 350 VA
transformer. An automatic system would be ideal however this gets a bit complicated with DH valves. There appears to be a lot of bull written about leakage inductance re toroids, when C cores are employed this appears to be swept under
the carpet, another example of snobism?????
Ideas on automating the balancing of the winding currents would be appreciated.
Khalif
transformer. An automatic system would be ideal however this gets a bit complicated with DH valves. There appears to be a lot of bull written about leakage inductance re toroids, when C cores are employed this appears to be swept under
the carpet, another example of snobism?????
Ideas on automating the balancing of the winding currents would be appreciated.
Khalif