11-06-2020, 07:06 AM
Even if they test OK now, I'd still be wary about using them in high stress positions such as TV line output stages.
In ordinary valve radios the only 1000V cap was usually the tone corrector, which could be subject to high peak voltages. I believe that a modern 630V is OK in this position, though can't give good evidence for this. Also the tone corrector is often connected from the OP valve anode to 0V. If it fails then this fries the OP transformer. Better to connect across the transformer primary where failure won't cause damage. Remember that to a decent approximation, HT and 0V are conencted together as far as AC is concerned.
In ordinary valve radios the only 1000V cap was usually the tone corrector, which could be subject to high peak voltages. I believe that a modern 630V is OK in this position, though can't give good evidence for this. Also the tone corrector is often connected from the OP valve anode to 0V. If it fails then this fries the OP transformer. Better to connect across the transformer primary where failure won't cause damage. Remember that to a decent approximation, HT and 0V are conencted together as far as AC is concerned.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
