2. amps-preamps
  3. 1323999458

Have I mismatched my preamp/amp?

Hey all; I recently purchased a Cary SLP-50B which I will be mating to a Rawson clone of the Pass Aleph 2. When I started doing the math, I know I'm slow, I looked up the output impedance of the Cary and its Aleph 2 from the Pass site and it's 2.2 K Ohms I checked the Pass site for the Aleph 2, being I don't have the exact spec on the Rawson, and the input impedance is 10 K Ohms unbalanced and 25 K Ohms balanced differential. The Cary only has unbalanced outputs. So, how mismatched is this? I understand the 20:1 rule and I'm way off. My point was to use the Cary to warm up the sound a bit of the Rawson, its brutally sharp and I thought warming it up was a good idea. Advice/Comments are welcome. Jack
fz1jmp
marakanetz's avatar
marakanetz
5,473 posts
 
Rrog,
I've always been under impression that Cary is good but for each good Cary there's a better Quicksilver as a matter of fact.
pubul57
3,712 posts
 
Those are pretty amazing output impedances for any preamp, let alone a tube one, how does he do it? I enjoyed everything I ever owned by Quciksilver.

I believe NP designed (but did not build - designed to a price point specificed by Adcom) the Adcom 555 (not the mkII which was altered by Adcom) and no other Adcom amp. Is that the one you were not impressed with? Pretty cheap amp if I remember correctly - but touted as one of them giant killers at the time.
atmasphere's avatar
atmasphere
11,957 posts
 
Those are pretty amazing output impedances for any preamp, let alone a tube one, how does he do it?

Lots of feedback. But if you check the 20Hz output impedance you will find it to be higher.
marakanetz's avatar
marakanetz
5,473 posts
 
Atmasphere,
Isn't it more important to have minimized feedback on power amp vs. preamp?
As far as I know, the differential preamp stages have 100% feedback... Why do engineers need to avoid it technically?
unsound
7,333 posts
 
http://www.diyaudio.com/forums/pass-labs/133067-someones-diy-aleph-j-sale.html
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