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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
Post removed 
georgehifi's avatar
georgehifi
10,312 posts
 
George is just a VERY sore looser when he’s proven wrong.

Your talking to yourself, and you have proved nothing, others have told you also, and you still don’t believe it.
You’ve built couple diy Pass amps kits, big deal, half the members here can also.
I also noticed you were outright rude to wolf_garcia, have another one sunshine.

To say it once again for the last time, complementary pair for complementary pair, you’ll get more amperage (current) from a BJT (bi-Polar) output stage than you will a mosfet output stage, end of story.
Nothing you say can change this, give up!.


abucktwoeighty's avatar
abucktwoeighty
1,079 posts
 
I don't come here as much as I used to, but I had a little time to kill and found this thread very entertaining.  May have to return more often.
audiobrian OP
183 posts
 
Hi George:
May I inquire what you might know of those large
industrial sized NPN mosfets used by GamuT, reported to generate extremely large amounts of current?
Nice sounding amplifiers......just curious.  Thanks!
unsound
7,315 posts
 

Pass Labs declines to spec their amps into 2 Ohms. Stereophile’s measurements of Pass Labs amps into 2 Ohms have resulted in a mixed bag of results. Interestingly (well at least to me) some of these "objective" results might be deemed either positive or negative depending on one’s perspective.

Pass Labs has a somewhat unusual way of specifying their amplifiers. They are not unique in that they like others before them underrate their output into higher impedances that in turn makes their output into lower impedances appear perhaps more academically elegant. On the other hand they seem to spec their amps to reflect their "Class A" output when it appears as though these seem to be more like some Pass’s earlier "Class A/AB" labeled amps (albeit with perhaps greater 4 Ohm "Class A") in that that above a certain output they can produce more power in "Class AB" mode.

Never mind, that there exists some skepticism regarding Nelson Pass’s use of "Class A" "Class A/AB" "Class AB" labels. Depending on one’s choice of criteria, the results might be perceived differently. IMHO, they are not generally especially qualified for 2 Ohm duty.


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