Systemic Development > Amplification and Preamplification
New Info Discussed, Class A, AB, B, and C operation/mode
steve:
I performed a review and cleaned up some possible ambiguity for those who found the
initial post confusing. Hopefully, the post will be easier to understand.
Cheers and all the best.
steve
Nick B:
Thanks, Steve. A bit difficult to follow as I’m not technically inclined. Have you designed Class A, AB, AB1 and even ever dabbled in Class D?
Nick
GDHAL:
--- Quote from: steve on February 20, 2024, 08:37:31 PM ---I performed a review and cleaned up some possible ambiguity for those who found the
initial post confusing. Hopefully, the post will be easier to understand.
Cheers and all the best.
steve
--- End quote ---
Hi Steve. I've never heard or read of "AB1" and some of the other classes that you mention. May I suggest you update this article?
https://en.wikipedia.org/wiki/Power_amplifier_classes
Thank you.
steve:
--- Quote from: Nick B on February 21, 2024, 06:46:19 AM ---Thanks, Steve. A bit difficult to follow as I’m not technically inclined. Have you designed Class A, AB, AB1 and even ever dabbled in Class D?
Nick
--- End quote ---
Yes Nick. I designed SET 6550/KT88/triode connected amps for a couple of years, an OTL amplifier triode wired,
200 watts output, and monoblock Class AB1 amplifier 25 watts output. Sold a few SETs and AB1 amps, but could
not really find a chassis that could handle shipping.
I found that I could design a Class AB1 amp that was near perfect, better than the others, with just the reactance speaker interface causing a sonic difference. That problem was virtually alleviated via matching both the speaker
wires and speaker crossover to the monoblocks.
The AB1 monoblocks feature separate power transformers, thus separate power supplies for each stage.
All polypropylene filter capacitors, except for the high voltage caps which are basically bypassed by a
poly capacitor, and cathode bypass capacitors across a low impedance cathode resistor path.
Along with the 11A line preamplifier, this setup creates a system with all the power supplies, except for the HV supply, having an poly decoupling capacitors. I found that eliminating each electrolytic decoupling capacitor improved the sound.
I checked out a schmetic or two of Class D, but never ventured into such.
cheers
steve
steve:
--- Quote from: GDHAL on February 21, 2024, 07:23:49 AM ---
--- Quote from: steve on February 20, 2024, 08:37:31 PM ---I performed a review and cleaned up some possible ambiguity for those who found the
initial post confusing. Hopefully, the post will be easier to understand.
Cheers and all the best.
steve
--- End quote ---
Hi Steve. I've never heard or read of "AB1" and some of the other classes that you mention. May I suggest you update this article?
https://en.wikipedia.org/wiki/Power_amplifier_classes
Thank you.
--- End quote ---
Hi Hal,
If I get a chance, I have some postings, if I can find them, that I would not mind presenting to Wiki concerning
that page.
Cheers
steve
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