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Home » Audio » Thermionic Emissions » Class A, AB1, B, C Operation/Modes (How Class A, AB1, B, C Modes Work and Their Strengths and Weaknesses)
| Re: Class A, AB1, B, C Operation/Modes [message #97158 is a reply to message #97061] |
Fri, 03 November 2023 12:22   |
positron
Messages: 97
Registered: May 2020
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Viscount |
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Just to reinforce my previous post, Chapter 13,
of the RCA Radiotron Designers Handbook, section 5:
"Push Pull Triodes Class A, AB1".
"A Class A amplifier is an amplifier in which the grid bias and
alternating grid voltages are such that the plate current of the
output valve or valves flows at all times. The suffix 1 indicates
that grid current does not flow during any part of the input cycle."
Notice, no mention of center of load line, nor any mention of power output
nor maximum power output.
From the Radio Amateur's Handbook, 1969:
" A Class AB audio amplifier is a push-pull amplifier .....
At low signal levels the tubes operate as Class A amplifiers,
and the plate current is the same with or without signal."
Wiki, Push Pull AB:
"Class AB is...... since much of the time the musical signal
is quiet enough that the signal stays in the "class-A" region."
What is quiet enough?
As mentioned in my first post, Push Pull 6L6GC in triode, can
output some 7.5 watts rms in Class A before cut off of each
tube, and into AB1 operation (cut off is substantially less
than 180 degree of each tube).
Academia classroom, the same definition. Any device(s) can be
operated Class A as long as the device(s) operate over 360 degrees,
all of the musical signal waveform.
cheers
pos
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Class A, AB1, B, C Operation/Modes
By: positron on Sun, 05 February 2023 20:40 |
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Re: Class A, AB1, B, C Operation/Modes
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Re: Class A, AB1, B, C Operation/Modes
By: gofar99 on Mon, 06 February 2023 20:38 |
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Re: Class A, AB1, B, C Operation/Modes
By: positron on Tue, 07 February 2023 16:13 |
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Re: Class A, AB1, B, C Operation/Modes
By: gofar99 on Tue, 07 February 2023 19:33 |
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Re: Class A, AB1, B, C Operation/Modes
By: positron on Tue, 07 February 2023 20:37 |
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Re: Class A, AB1, B, C Operation/Modes
By: gofar99 on Thu, 09 February 2023 21:01 |
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Re: Class A, AB1, B, C Operation/Modes
By: positron on Thu, 09 February 2023 21:35 |
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Re: Class A, AB1, B, C Operation/Modes
By: positron on Tue, 28 February 2023 19:04 |
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Re: Class A, AB1, B, C Operation/Modes
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Re: Class A, AB1, B, C Operation/Modes
By: gofar99 on Wed, 01 March 2023 19:45 |
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Re: Class A, AB1, B, C Operation/Modes
By: positron on Sun, 05 March 2023 00:33 |
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Re: Class A, AB1, B, C Operation/Modes
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Re: Class A, AB1, B, C Operation/Modes
By: gofar99 on Sun, 05 March 2023 08:10 |
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Re: Class A, AB1, B, C Operation/Modes
By: positron on Mon, 06 March 2023 19:01 |
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Re: Class A, AB1, B, C Operation/Modes
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Re: Class A, AB1, B, C Operation/Modes
By: gofar99 on Tue, 09 May 2023 21:30 |
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Re: Class A, AB1, B, C Operation/Modes
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Re: Class A, AB1, B, C Operation/Modes
By: positron on Tue, 05 September 2023 23:48 |
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Re: Class A, AB1, B, C Operation/Modes
By: gofar99 on Fri, 08 September 2023 21:12 |
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Re: Class A, AB1, B, C Operation/Modes
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Re: Class A, AB1, B, C Operation/Modes
By: positron on Thu, 12 October 2023 11:21 |
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Re: Class A, AB1, B, C Operation/Modes
By: positron on Fri, 03 November 2023 12:22 |
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Re: Class A, AB1, B, C Operation/Modes
By: gofar99 on Fri, 03 November 2023 20:58 |
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Re: Class A, AB1, B, C Operation/Modes
By: positron on Sun, 05 November 2023 01:38 |
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Re: Class A, AB1, B, C Operation/Modes
By: positron on Thu, 07 December 2023 23:12 |
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Re: Class A, AB1, B, C Operation/Modes
By: gofar99 on Mon, 18 December 2023 20:20 |
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Re: Class A, AB1, B, C Operation/Modes
By: positron on Tue, 16 January 2024 21:32 |
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Re: Class A, AB1, B, C Operation/Modes
By: gofar99 on Wed, 24 January 2024 20:31 |
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