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In Reply to: RE: Ping John Elison re Parasound A-21s posted by John Elison on February 19, 2015 at 16:58:50
be left on 24/7 unless you know you will not be using it for quite a while.
Opus 33 1/3
Follow Ups:
It seems to work well for the A21 so far. My Pass Labs XOno and X1 do not have on/off switches so they remain powered up continuously, too. They've been running for nearly 12-years except for when I leave home on trips or vacation.
Best regards,
John Elison
the stereophile reviewer on the benefits of leaving his amp on 24/7 and the sonic improvements after given lengths of on time.
My PS Audio gear (P 200 preamp and C 100 Integrated) are both designed to be left on 24/7. The power switches are on the back panel.
Opus 33 1/3
If the amp is not heavily biased toward Class A operation and doesn't idle hot it makes sense to leave it ON 24/7.
I measured the Odyssey Stratos Extreme which drew about 75-watts just sitting there idle and it wasn't very warm to the touch. I left that one ON 24/7 as it required a pretty long warmup period before sounding decent.
On the other hand, my Pass Labs X150 drew 200-watts at idle and got fairly warm. I turned that one ON in the morning and OFF at bedtime.
I have no idea how much power the A21 draws at idle but that might influence ones decision on how to manage it's ON/OFF period.
They are great amps for Maggies.
Opus 33 1/3
Just be sure to get the models ending in ".5" (or the new .8).
There is a difference and those are the ones you want.
I had the X150 and later the X150.5. Overall the .5 sounds a little more refined but with a nice tube preamp in the chain, either one can sound excellent.
One of my favorite setups was the X150.5 driven by the Cary SLP-05 6SN7 based tube linestage.
I bought my X150 used otherwise they're way too expensive. I heard the Parasound A21 at a dealer and it was pretty impressive. I liked it much better than the McIntosh in the adjacent rack. In fact, I had the dealer let me listen to both on the same speakers and the Parasound was the easy winner to my ears.
Abe, just curious, what McIntosh amp did you hear? When I had a C220, I lusted after an MC252 or whatever but after much reading (no listening) I've pretty much decided the A21 would be what I'd get if I went high power SS. One of these years ... maybe!
Opus 33 1/3
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