+1 - Paul Joppa - Tube DIY Asylum

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

+1

In Reply to: RE: SE Pentode output stage question posted by Eli Duttman on November 20, 2014 at 09:20:43:

The plate choke is (at audio frequencies) in parallel with the OPT, so as long as the inductance is high enough the load seen by the tube is the OPT primary reflection of the speaker impedance.

The feedback loop has more phase shift if you include the OPT inside the loop, so proper stability design takes on a different requirement - you can't just count on copying a series feed circuit.

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Kimber Kable

Follow Ups Full Thread

Topic - SE Pentode output stage question - DanK tubes 22:35:58 11/19/14 (3)

RE: SE Pentode output stage question - Eli Duttman 09:20:43 11/20/14 (2)

+1 - Paul Joppa 13:03:41 11/20/14 (1)

Thanks guys! (nt) - DanK tubes 15:03:49 11/20/14 (0)

Follow Ups

+1 - Paul Joppa 13:03:41 11/20/14 (1)

Thanks guys! (nt) - DanK tubes 15:03:49 11/20/14 (0)

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