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In Reply to: RE: Making measurements advice posted by gusser on September 18, 2017 at 17:03:35:
...The TV flyback transformer is often cited as analogous to an audio OPT with an open secondary. The flyback transformer makes use of the extremely high dI/dT that occurs during retrace (voltage across an inductor = L*dI/dT). For an audio transformer passing a typical sine wave test signal at lower powers, I can't imagine the dI/dT factor would be so great as to stress insulation resistance of a stable and properly operating tube amp, secondary loaded or open circuit. I'm not sure even a square wave would be much problem at reasonable powers. Personal experience mostly supports this. The only situation where I've run into flyback like voltages on the pri of an audio OPT is when a tube arcs; a gross fault condition. Another potential damage situation might be where an amp is subjected to hard clipping and the load is suddenly removed as might occur with speaker burnout in a musical instrument amp but this is a special test condition.FWIW, many high quality amps from the golden age touted as a feature, unconditional stability and safe operation into any load including an open circuit. Marantz, Mac and the better Heaths come to mind.
Edits: 09/19/17
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Follow Ups
- A thought... - Steve O 19:53:59 09/18/17 (5)
- RE: A thought... - dave slagle 06:24:11 09/19/17 (4)
- "I see gussers concern"... - Steve O 08:22:16 09/19/17 (3)
- RE: No, I do understand the transient vs continuous condition. - gusser 08:49:09 09/19/17 (2)
- Don't capitulate on this point! - Triode_Kingdom 12:57:07 09/19/17 (0)
- Okey-doke! (nt) - Steve O 09:18:54 09/19/17 (0)
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