Considering switching from Audio Research to PrimaLuna, troube with VS115 amp


Hello everyone, I have question that I hope some of you either can answer or have an opinion on. Ever since I was 17, I have always wanted to own Audio Research equipment. I’m 56 now, and finally was able to fulfill my life long dream. My first acquisition was an ARC LS15 pre-amp bought here used in mint condition. I paired it with a Vincent 331MK hybrid amp also bought here used in mint condition. The resulting sound was impressive. After that, I started looking for an ARC amp I could afford. The resulting search found me an ARC VS115 amp also here in used, awesome condition. This is where my problems and my doubts started. Upon hooking up the amp to my system, a tube in the left channel arced and blew a resistor. I had to take the amp to an ARC dealer and he installed a new resistor and suggested I buy all new tubes from ARC for the amp. I did and when I got back home, I again hooked up the amp and immediately upon turning the amp on, I started to hear thumping sounds coming from my left speaker, then, two left channel output tubes started to glow a very bright orange, and then white smoke started to rise from one of the tube sockets. I immediately turned the amp off. I called the dealer and he suggested I mail the unit back to ARC. I did and I am now waiting to see what they say.

During this time, I started to search out other brands and came across one called PrimaLuna. I have watched their videos and seen them compared to ARC equipment. Their build quality seems to be superior to ARC and the reviews are over the top. I am looking at their Dialogue Premium HP amp and their Dialogue Premium pre-amp. For what they cost, considering how they are built and supposedly sound compared to units costing 3 to 4 times their price, they almost seem too good to be true. Anyway, my bubble has been burst, and in simple terms, I am considering jumping ship and going with another company instead of ARC, despite all those years of drooling and waiting.

My main question is this, is there anyone out there that either owns PrimaLuna or has had experience with the equipment and can give me their opinion on owning and using it. Then, my second question is how does PrimaLuna really compare to other high end equipment such as ARC. Kevin Deal in his videos on PrimaLuna makes a very compelling case for the equipment. In one video, he compares an ARC LS17SE to the PrimaLuna pre-amp.

My last question is in regards to my ARC VS115 amp problems. Anyone have an opinion on what is going on with my amp or a VS115 in general. For those of you who want to know what else is in my system, I am using KEF 104ab speakers, a Cambridge Azur 752BD Blu-ray player as my CD player, Morrow Audio Cables and I am considering getting the Sony HAP-Z1ES music player for my digital files.

I greatly appreciate all who take the time to comment and give their opinions. I will be glad to answer any questions you may ask or provide additional. Thanks for your help. Steve.


128x128skyhawk51
I noticed you said if looking for Med to High Power Tube Amp look at VAC. A lot of people can't afford VAC. What other company would you recommend looking at? Would Primaluna be a consideration?
I wish I could responsibly advise you on this. 

Most of my recent exposure has been to low power triode amplifiers - 2A3, 300B, 845 and such, and it's only serendipitous encounters with both Kevin Hayes and VAC in general that led me to bring them up.  Indeed, they occupy more of the ARC price tier and not Prima Luna's.

Prima Luna appears to make many intelligent design compromises (to meet a price point), but without hearing them I'd hesitate to say, other than to recommend an audition.

Cheers,
Thom @ Galibier Design
"The DiaLogue Seven is completely handwired, point to point—and I’ve never seen a better-built amp. Wires were neatly trimmed and dressed, with no strand out of place. I spent a long time trying to find a single bad solder join, and could not: Someone made this as if it mattered."  -  Art Dudley, Stereophile Magazine

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Art Dudley is one of the industries most experienced and respected writers.  

And this was an earlier product before PrimaLuna added Silver-plated oxygen free copper wiring imported from Switzerland, Takman resistors, and Mundorf Mcap Evo Silver/Gold caps.  
   
I don't think I need to address build quality.  Or how they are built, or what "qualifies" as point to point.  The most technically adept critics have all said it.  If there is a better built amp, I'd like to hear about it.  Only to applaud it as they exist I'm sure.  The only contender I can think of off-hand is Atma-Sphere.  Any others in that club, my hat's off to them!
Thanks for the write up btw. Appreciate your time.
You’re welcome @aniwolfe

I don’t think I need to address build quality. Or how they are built, or what "qualifies" as point to point.
I don’t mean to be a stickler, but respectfully Kevin, I think you do, since it’s in your advertising collateral.

BTW, my philosophy (others may differ) is that if a component is inside the box, it's in the signal path.  Then again, I also think that power cords make a difference ;-)

None of this is meant to cast aspersions on what is very likely a fine product (I recommended its audition). Benefiting from offshore manufacture, the Prima Luna’s construction looks like that of an amplifier costing three times its price.

My earlier post grew long, and I only implied another reason for PCB construction (apart from addressing circuit complexity) - to bring a product into a more affordable price class. If done intelligently, you can produce a very fine product.

One such component using PCB construction (which I heartily endorse) is Keith Herron’s VTPH-2 phono stage. If it were entirely hand-wired, its price would likely triple. I’d love to hear Keith’s original breadboard prototype of this phono stage. I’ll bet it’s quite special.

Congratulations on carrying a product with such value!

Cheers,
Thom @ Galibier Design
Good posts Thom and you are most accurate and thoughtful in your posts. I am a big fan of 100% point to point and tag strip tube builds. Hard to find these anymore as you know. I also like no electrolytic caps in the power supply...only film. Yes, this can make for a larger chassis and increased cost, but I hear the difference.

The VAC gear is circuit board is it not?

I looked at at your site and did not see any pricing on your new 300b amp. I think it is due out soon. Looks very interesting.