Being new to a subject doesn't make you thick! 
When you ask what 'the linear part' means, do you mean 'ultra-linear (UL)'? If so, that's just a term coined by Hafler and Keroes in the 1950s for a way of usiing tetrodes or pentodes so that the screen grid is connected to a tap on the ouput transformer primary winding, between the tube's plate and the positive (B+) rail. This arrangement is meant to give the best aspects of both triode (low output impedance and low distortion) and pentode (high efficiency and power). UL has become very common since the 'fifties, and can be used either single-ended or push-pull.
If you want to learn more about tube audio, you could look at Max Robinson's 'Fun With Tubes' site. Max is a retired college teacher, his website is easy to navigate and it contains quite a lot of info on tube circuitry for both audio and radio, in a non-technical way.
Later, if you become really interested, you might want to invest in a good book such as 'Valve Amplifiers', third edition, by Morgan Jones.
When you ask what 'the linear part' means, do you mean 'ultra-linear (UL)'? If so, that's just a term coined by Hafler and Keroes in the 1950s for a way of usiing tetrodes or pentodes so that the screen grid is connected to a tap on the ouput transformer primary winding, between the tube's plate and the positive (B+) rail. This arrangement is meant to give the best aspects of both triode (low output impedance and low distortion) and pentode (high efficiency and power). UL has become very common since the 'fifties, and can be used either single-ended or push-pull.
If you want to learn more about tube audio, you could look at Max Robinson's 'Fun With Tubes' site. Max is a retired college teacher, his website is easy to navigate and it contains quite a lot of info on tube circuitry for both audio and radio, in a non-technical way.
Later, if you become really interested, you might want to invest in a good book such as 'Valve Amplifiers', third edition, by Morgan Jones.
ray_moth said:Being new to a subject doesn't make you thick!
When you ask what 'the linear part' means, do you mean 'ultra-linear (UL)'? If so, that's just a term coined by Hafler and Keroes in the 1950s for a way of usiing tetrodes or pentodes so that the screen grid is connected to a tap on the ouput transformer primary winding, between the tube's plate and the positive (B+) rail. This arrangement is meant to give the best aspects of both triode (low output impedance and low distortion) and pentode (high efficiency and power). UL has become very common since the 'fifties, and can be used either single-ended or push-pull.
If you want to learn more about tube audio, you could look at Max Robinson's 'Fun With Tubes' site. Max is a retired college teacher, his website is easy to navigate and it contains quite a lot of info on tube circuitry for both audio and radio, in a non-technical way.
Later, if you become really interested, you might want to invest in a good book such as 'Valve Amplifiers', third edition, by Morgan Jones.
Also referred to in the UK as 'partial triode mode' operation.. Definitely get Morgan Jones..
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