Never had any Threshold or stuff by JC thru here.
Both those guys should be on the list.
That twigged another one, name escapes me atthe moment. Started the whole wire “revolution”
dave
Both those guys should be on the list.
That twigged another one, name escapes me atthe moment. Started the whole wire “revolution”
dave
James Edward Sugden for the worlds’ first production pure class A transistor amplifier.
https://www.audioaffair.co.uk/blog/sugden-a-long-history-of-class-a-and-british-made-hi-fi/
https://www.audioaffair.co.uk/blog/sugden-a-long-history-of-class-a-and-british-made-hi-fi/
I feel the need to google, there must have been class A transistor amplifiers before that surely?
Still feels wrong. Hence my need to go furtling in the dark back waters of the internet. Although there will be some greybeards on here who were there and remember 😀
Weren't the transistor amplifiers from the 1950's mostly single-ended class A?
I didn't exist back then, but I read some 1950's hobby electronics magazines. The few transistor amplifiers in those magazines were typically single-ended class A (and very low powered).
I didn't exist back then, but I read some 1950's hobby electronics magazines. The few transistor amplifiers in those magazines were typically single-ended class A (and very low powered).
only in the marketing team's minds. for me SE is more pure as you can't go out of class A operation.
Moving on from James Edward Sugden, I'm now going to nominate Gilbert Arthur Briggs.
Founder of Wharfedale Wireless Works, England, in 1932, and author of 21 audio related books.
Founder of Wharfedale Wireless Works, England, in 1932, and author of 21 audio related books.
My meager "contibution" to audio is/was spending decades at a service bench in various shops, (25 years in the last shop before retiring) keeping customers happy with their equipment.
From a 1929 floor model radio, to the latest garbage being produced in modern times.
In many cases, making modifications to correct errors, or elevate reliability/performance, or improving safety in designs.
And yes, throughout the years, also custom-designing some equipment from scratch, taking cues from manufacturers that produced fine quality equipment that lasted and was revered throughout the ages.
From a 1929 floor model radio, to the latest garbage being produced in modern times.
In many cases, making modifications to correct errors, or elevate reliability/performance, or improving safety in designs.
And yes, throughout the years, also custom-designing some equipment from scratch, taking cues from manufacturers that produced fine quality equipment that lasted and was revered throughout the ages.
While not exactly stand alone amplifiers, all those "two transistor reflex circuit" AM radios from the late 50's and early 60's were Class A, as were all of the car radios of the day where the tuner and audio driver circuitry were space charge vacuum tubes and the output stage was a big fat TO-36 germanium transistor in a class A SE circuit using an OPT. I learned at an early age that those early transistors were pretty easy to fry.
Yes, you can usually bias any topology into class A, but an SE amp must by definition be class A. Now even a true class A SE guitar amp (not a marketing defined class A amp) leaves class A as soon as you plug in a mega overdrive pedal, set the controls for the heart of the sun and blast away. So does that nice sounding SE HiFi amp when it hits clipping.
No. More like high bias Class AB being called Class A by the marketing guys.
There is sliding bias Class A, but the best Class A tend to be smallish so no need for the complication.
dave
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