• 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.

SE Output Transformer Matching

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ttan98

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Joined 2006
As most are aware that most designs single ended 300B is quite straight forward.

What I notice in a no of designs is the use different output transformers with different impedances.

The 3 different impedances used are 2.5K, 3.5K and 5K. My question is, is there an optimun impedance, I believe sound quality is important(lower impedance give a fraction more power, higher impedance is better linearity) in this case?

Any thoughts out there, eg matching types of tube( include KT88 and EL34 and 2A3) with their respective impedances.
 
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