Class A Solid State Sound


Would someone kindly describe the differences in class A sound of Pass XA.8 series, Accuphase A-70/75 series, and Gryphon class A amplifiers. Does much or any of the differences relate to mosfet (Pass and Accuphase) or bipolar (Gryphon)  output devices?  Thank you!

audiobrian
When i was amp shopping, I listened to lots of the discussed amps and walked away with Ayre.  Class A to about 50 watts...no correction feedback at all, etc.
but what’s the opinion of you guys on the capacitor-lifespan of a quality pure Class-A amp - 10, 15 years, or more?
If the interior of the amp is getting hot then yes the life of caps diminish considerably, they dry out and can leak. Not a bad idea to use a slow turning fan inside to push or pull the hot air out, this will stop the caps from drying out.

The ME amps I have  this in a way, they do this with their whole range, they also use the variable speed fan to cool the transistors to their ideal junction temperature regardless of which Class-A bias setting is used through the chimney heatsink while listening.
And when the amp is turned off the fans continue till the heatsink has cooled right down so there's no buildup of heat, the internal  heatsinking/fan also keeps all the stacks of over 300,000uf of capacitors cool.

https://ibb.co/fr6SNVT
https://ibb.co/D1h5nnF
https://ibb.co/GcSfbCT

Cheres George
no correction feedback at all
It would have had local not global feedback, just around the input/driver section not the output stage this is a very good feedback system first used/invented I believe by Matti Otala many years ago 70’s 80’s, just like the ME’s above.

Cheers George
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