I'd like to know what's the simplest example of two-port parallel-parallel network that fails Y=Ya+Yb. Just as two T networks fail series-series connection, I thought that two Pi network would fail parallel-parallel, but it isn't true. Could you help me giving a simple example?

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    \$\begingroup\$ How about an example of "failure"? \$\endgroup\$ – analogsystemsrf Jun 27 '17 at 9:06
  • \$\begingroup\$ @analogsystemsrf i'm referring to this en.wikipedia.org/wiki/Brune_test \$\endgroup\$ – Surfer on the fall Jun 27 '17 at 10:23
  • \$\begingroup\$ @Surferonthefall I think you should try to answer this by yourself based on the examples for series fails, and figuring when a potential difference will be created in the parallel configurations. It is not difficult at all. BTW, the T networks DO NOT fail series-series connections ALWAYS. Look carefully at the examples/ \$\endgroup\$ – Claudio Avi Chami Jun 27 '17 at 17:08

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