2. amps-preamps
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ARC preamp line up

Just getting into ARC preamps and while i was hesitant to jump on an SP5, I have to admit I am thrilled about the soundstage and detail. I thought I was going to have issues with it being too analytical or bright but turns out I really like the sound...to boot it has a phono for my LP12.

I also know that the Sp5 seems to have little or no praise and is probably one of the cheaper models, but having said that, it sounds so good to me.

So my question is, what is the next step up from this model in terms of solid state and if I go to the earlier models (read below $1K) with/without the single 6922 tube do I lose anything that I like with my SP5? From my research I guess i should only be looking at the SP series for phono or do some of the LS models come with phono?

thx for your input
vinylb
2chnlben
595 posts
 
Vinylb

For example, the ARC SP17 has a line stage input impedance of 60K, which would not be a great match with your solid state amp with an input impedance of only 47K.

Krell, for example, builds many of their amps with tubed pre-amps in mind - such as their 402e with a single ended input impedance of 100k and 200k for balanced.

I think the ARC Sp5 is a solid state...?

Anyway, be sure to consider this important factor...

_Ben
vinylb OP
4 posts
 
I sure will.....my last purchase was not a pleasant one due to impedance so I now make a point of checking for it. Thx

Why are output impedance of some preamps so high ?

Anybody now about my question about remote control? I see in the arc database some models had remote as optional...does this mean the circuitry was already there or did it require rework?

I think I should be looking at an SP6/sp14 preamp in meantime.
nevillewoo
4 posts
 
I sure will.....my last purchase was not a pleasant one due to impedance so I now make a point of checking for it. Thx

Why are output impedance of some preamps so high ?

Anybody now about my question about remote control? I see in the arc database some models had remote as optional...does this mean the circuitry was already there or did it require rework?

I think I should be looking at an SP6/sp14 preamp in meantime.
hifigeek1
770 posts
 
If you plan on purchasing an SP-6 series make sure all the filter caps in the power supply have been replaced. In the A/B versions there are quite a few and they are not cheap. As long as they have been replaced in the past 8-10 yrs they still have useful life. If they are original, expect to replace them. In the B version you must replace them. That unit has many stages of regulation. If one cap fails and damages the regulator, it can take out all the other regulators. It is an expensive and difficult repair. I've had to do it many times.
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