• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

PP output transformer grounded or not ?

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jogas

Member
2004-06-11 10:51 am
Milan
HI,
some push pull schematics are showing the loudspeaker side of the output transformers grounded and some others not.
What is the difference and why a ground connection on the OT?
In principle the output side is (and should be) isolated by the rest of the circuit from the output transformer itself... or I miss something?
 
not only safety

To my knowledge, grounding the output transformet, PP or SE, change also the parasitic capacitance.
If the interleawing of winding is made in a certain way, the secondary grounded coils act as electrostatic screen, beaking the parasitic pri/sec capacitance and hence extend the frequency response.
 
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