Passlabs Aleph 1.2 with CJ Tube 17LS/16LS Preamp


I am considering buying Aleph 1.2s to marry with a cj tube pre, the 17LS or the 16LS. The only problem I can see is that the unbal RCA input impedance of the Aleph 1.2s is approx 10Kohms and the output impedance of the 17LS or the 16LS is somewhat of the high side, i.e. approx close to 1kohms.

Does anyone have suggestions how the two of them would sound together? esp with this impedance mis-match problem

Also, any opinions of the Aleph 1.2s with B&W 801s / 802s.
arupg

Showing 4 responses by arupg

I had a long discussion over phone with Passlabs people and they reckon and strongly suggest that even a 1,000 ohms output impedance out of any preamp will not upset the Aleph 1.2 whose input impedance is only 10,000 ohms provided, a quality interconnect like Cardas "golden ref" is used. Yes - the extra warmth of the cj might be too much. I was speaking to another ultra highend specialist who suggested the FM Acoustics new resolution series 155 preamp to go with the Aleph 1.2s. I do know that FMA gear is very neutral, typical of the swiss and they practically thrive on 'neutrality'. Wonder, how this would match? The FMA 155 also have quite low output impedance, typically around 100 ohms.

Also, may I clarify that the Aleph 1.2s I am talking about are 200 watt monoblocks at 8 ohms. These are the flagship ones of the entire Aleph range of amps.
Very interesting Rayhall & John_1:
No, I'm not looking for the last word in bass slam etc. What I'm looking for is overall completeness, i.r. attack, growth of the tone, and decay, all of which are plenty in abundance of a SET(tube)amp. But, the SET doesn't have the extended bandwidth of the Alephs. I'm also looking for holographic imaging, and am a soundstaging freak. I was told my people from KimberKable that using their Kimber Select KS3033 cable instead of the much touted BifocalXL would give me more body, bigger soundstage etc. Is this a fact? I was thinking of considering either the Cardas "Golden cross" or "golden Ref" as speaker cables with my B&W 801/802s. Appreciate your inputs.
Hello Rayhall:
Thanks for the input on the KS3033. I suspected that they could get a bit on the bright side as Kimber claims more air, & more air! Maybe, Cardas either "golden cross" or "Golden Ref" make be the cable for me then. As regards to the Aleph1.2s, yes, I wanted an amp without the usual solidstate nasties (which is the odd-order distortions). How do you feel about your CAT / Aleph 4 marriage, esp considering the low input imp of the Alephs and the fairly high output imp of tube preamps.
Rayhall,
Since your CAT is 100 ohms looking into the low input imp of the Alephs, there should be no imp mismatches here. I've auditioned Nordost line of ICs and do find them a little clinical with certain types of music. I keep returning back to the cardas and find they have "soul" in them. Its just a feeling.