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How long does Class A have?

Hi Guys/Gals
 I have a Sugden A21SE which is a Pure Class A single ended design, I absolutely love this musical amplifier with its strangely plentiful 30wpc, it runs hots as they do, I always enjoy watching the faces of my uninitiated friends when they touch it after I mention they get hot, lol.
But in this modern green era I wonder just how long do Class A amplifiers have before Greta Thunberg gets wind of this inefficient method of creating sound and pisses on the parade?

Thoughts?
mrmeaner

Showing 3 responses by georgehifi

georgehifi's avatar
georgehifi
10,312 posts
 
The A1 was a very poor design of heat sink, more like a muddy shoe wiper grid.
It bent badly on hot days, finned heatsinks need to be vertical not flat.

Look at the heat buckle starting in this one, lifting at both ends
https://specialistdivision.files.wordpress.com/2013/03/musical-fidelity-a12.jpg?w=710&h=474

Cheers George
georgehifi's avatar
georgehifi
10,312 posts
 
Why don’t manufacturers list the amount of amps (current) their amplifiers and receivers put out. It is nothing to do with watts. It all has to do about current.

I think they hide this number because they know their amplifiers do not produce much current.

Why? if they can’t do it they will miss out on a sale.

Listing the amount of current and watts and close to double into 8 then 4 and 2ohms, will give an indication if the amp can drive nasty loads, that so many of todays hiend speakers have. Not good for so many amps, Tube, Class-D and many Mosfet, have trouble into those speakers like Wilson Alexia 0.9ohm in the bass, your big BJT (Bi-Polar) output amps do well there Krell, Gryphon, Agostino, Mark Levinson etc etc


Cheers George


georgehifi's avatar
georgehifi
10,312 posts
 
mrmeaner OP
How long does Class A have?

So long as people want the very best, it’ll last forever.
Nothing comes close to a Linear Solid State >100w Pure Class-A that can also do big current down into low impedances.
IE: keep close to doubling wattage for each halving of impedance down to 2ohms

Cheers George
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