Audio Research Ref 5 and Krell amps


Hello,

Just wondering if ARC Ref 5 preamp will mate well with Krell FPB 450 MCX monoblocks. My speakers are Revel Salon 2.
sfstereo

Showing 9 responses by bifwynne

Sfstereo, I used to own an ARC Ref-3. I recently exchanged it for a Ref-5. I love my ARC gear, especially the Ref-3/5. Just for fun, I suggest you try to demo an ARC tube amp from a dealer or friend and match it up with the Ref-5. If you do, get ready for a real treat for the ears. The synergy is magical, which should be no surprise.

Two important caveats. First, I have read that a new Ref-5 has a long break-in-period; maybe 500 hours. So if you're inclined to see what the Ref-5 can do when hooked up to an ARC tube amp, be patient. Same holds true even if you pass on the ARC tube amp/Krell SS amp shootout. Don't judge the Ref until it breaks in.

FWIW, I see that a number of Ref 110 power amps are listed on A'gon. Try and use KT-120 tubes. If you want more power, ARC just released for your listening pleasure the new Ref 150, which replaces the Ref 110.

Second, as always, if you road test an ARC tube amp, be sure it will match well with your speakers.

That's about it. Good Luck!!

Not a dealer and no relationship to ARC. My gear is all ARC tube and I suppose I am prejudiced in favor of ARC.
Sfstereo, I own the REF 5 and used to own the Ref 3. I concur with Micro insofar as saying that the Ref 3 and 5 have similar input/output electrical attributes (e.g. impedance, voltage etc). So, if the Ref 3 works well with the Krell, I expect the Ref 5 would as well.
Sfstero,

Aside from my general preference to buy used gear rather than new for financial reasons, you raise another reason to buy used -- used gears avoids long break-in times. The "used" new Ref-5 that I recently picked up on A'gon had about 1100 hours on it. Just broken-in, yeah!!

As I said in my preceding post, I wouldn't drop any money on a tube amp unless you road tested it first. Having a chat with your friend about tubes amps is a good idea.

As a general matter, pre-amps/line stages and other source tube based inputs (e.g., CDP and phono stage)don't require a lot of care and feeding. The tubes last a long time, except that in ARC gear, the power supply may use a power tube (e.g., 6550C or 5881) which may need to be replaced every 2000 hours. Some of the hybrid gear does not use a power tube in the power supply -- it's solid state.

IME, tube power amps, at least my tube amp, requires a little more attention, e.g., power tube (KT-120, 6550C etc) replacement every 2000 hours and bias adjustment. Some tube amps have automatic bias capabilities - my ARC does not. Of course there's always the occassional pesky bias tube resister that could blow if a tube arcs (i.e., goes bad). Fortunately, there's an ARC authorized service tech who lives near me and makes house calls. Very sweet. Frankly, I enjoy fiddling with my amp. I find it relaxing and interesting.

Well . . . good luck again.
Boisehomes, congradulations on the LS26 and best of luck with it. Not quite sure how you intend to load its main outputs, but please check my posts on this issue. In my case, I loaded my Ref 3 main output #1 with my ARC VS-115 and main #2 with my self powered sub. The rest of the story is in my posts. If you "overload" the LS26, you may experience best roll-off as well as other sonic degradations. If you think this is an issue, send me an e mail and I will explain how to solve it.

Cheers
Boisehomes, just checked the specs on the LS 26. Seems like most (maybe all) ARC preamps and line stages (including the LS 26) should not have their main outputs loaded with less than 20K Ohms. If you load both output mains, the formula for computing combined impedance is L1 x L2/(L1 + L2). So, e.g., if Main 1 is used for an amp with an input impedance of 300K Ohms and Main 2 is used for a self powered subwoofer with an input impedance of 20K Ohms, the combined impedance would be 18.75K Ohms -- too low.
First thing out of the box, call VPi and review with Mike or Harry you problem and path forward plann to so. If they advised you that combine impedance is too low, thereby putting too heavy a load on the pre, they may give you some practical solutions. In my case, I reached out to To Tutay, who in turn built me a custom impedance buggers.
Sfstereo, where can I learn more about the Ref 5 SE. This is the first I heard about it. Is the upgrade done by ARC??
Doggiehowser and Sfstereo, just e mailed a local ARC dealer in Philly land. He confirmed that ARC is indeed releasing a new Ref 5 SE version. The announcement could come out at any time. He did not know whether the legacy Ref- 5 could be upgraded. He said (1) the front changed - round buttons instead of square button, insides -- (2) more muscular power supply -- new verticle mounted board with additional 8-12 power caps; and (3) teflon coupler caps.

The dealer said that he has not heard the new 5 SE yet for himself, but reported that the buzz in dealerland is get ready for something special.

Does anyone know if the legacy 5s can be factory upgraded? I don't care about the cosmetic changes to the front panel and round button part, just the guts.
Tyler, I posted this thread in another OP, but thought I would repeat it here.

"I am unsure about getting my Ref 5 upgraded. I'm concerned the SE may be way out of balance with the rest of my system. Alternatively, if I was to drop the bucks of an SE upgrdae (whatever it is) into my system, I might do better waiting to change out my PH-7.

"Just not sure?? Also not sure how long ARC will do the SE upgrade. Maybe for the indefinte future??? Maybe not??

"I'm standing pat on my amp. It's too close to the Ref 110 to change it out. If I change out the amp, IMO, it only makes sense to wait for Ref 150s to hit the pre-owned market.

"At this point, IMO, digital "redbook" CD (actual discs) is generally just fair, so I'm not motivated to change out my CD-7 CDP. Think I'd rather get a DAC 8 instead.

Any thoughts??"

Thanks.

BTW, my system description is listed on A'gon.