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Old 18th July 2007, 10:50 AM   #1
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Hi everyone im new to the valve amp scene but have one question me being thick... what is ment by push and pull amp also whad does the linear part mean

cheers

barrie
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Old 18th July 2007, 11:20 AM   #2
Colt45 is offline Colt45  Serbia
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push-pull is a two device setup.

one tube amplifies the top half of the waveform, and the other amplifies the bottom half. The crossover point makes the difference between class A, AB, B..


It's like a two-handled saw.
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Old 19th July 2007, 02:01 AM   #3
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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.
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Old 19th July 2007, 02:24 AM   #4
Apex Jr is offline Apex Jr  United States
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Thanks Ray Moth, that was a good link for information

Steve @ Apex Jr
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Old 19th July 2007, 04:51 PM   #5
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Many thanks Guys and thank-you for the link

regards

barrie
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Old 19th July 2007, 10:47 PM   #6
kevinkr is offline kevinkr  United States
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Quote:
Originally posted by ray_moth
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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