Recapping an ARC LS-5 mkiii


So I have done an exhaustive Internet search on this, and have some answers (but not all).

Every piece of audio gear I have from the 80's and 90's has had some sort of issue and needed mods and/or repairs. Some of this wasn't audible, but showed up when the equipment was put on a test bench.

Every piece of classic/vintage equipment I have (Aragon, Sonic Frontiers, Audio Research) has been updated except for my LS-5 mkiii preamp. With ARC gear, I know lots of people tend to think of them like classic cars and look down anything ARC didn't do originally.

At the same time, I know ARC offers a Stealth Cap upgrade (roughly $800 IIRC) and I also know Steven Huntley at GNSC used to modify ARC gear (including the LS-5), but I can't really find anything out there on what that process involved.

I am interested in getting the Stealth Caps done, however, outside of that, I don't want to change the sound signature too dramatically (like shoehorning an LS V8 motor into a Mazda RX-7). I'm sure there are some gains to be made (Rel Caps to Infinicaps?), but want to make sure I do things the right way.

BTW, the preamp sounds good (to me), but as I've learned, that doesn't always mean it would test completely within spec.

Thanks in advance.

atlvalet

Ah, okay. Thanks.

Think I have settled on what I’m going to do.

On the LS-5 mkiii it looks there is 1 output cap and 2 bypass caps per channel. Going to upgrade each output cap to a Stealthcap and upgrade the bypass caps to Dynamicaps. (That will still be in the "voicing" that ARC uses since their REF stuff gets Stealthcaps and Dynamicaps are made by TRT as well).

Then I’ll let the tech replace anything else that is out of spec (I’ll ship to Pyramid Audio, who resurrected my D400 mkii, which ARC now calls "unserviceable").

@atlvalet  Look up Scott Frankland Associates in San Jose, CA

He just changed 16 Caps in my LS5 MKIII and it was worth every penny.

Sonic difference was Outstanding!

Thanks @djohn. Scott looks EXACTLY like the kinda guy I want tweaking my equipment.

Also, would love to see pics of the work in this thread and what exactly was replaced with what.

Glad to hear you feel the differences were noticeable.

@atlvalet For Audio Research and or any Tube Electronics, Scott Frankland is your kinda guy.

As a Heads Up, only Scott Frankland touches my Gear. He has totally Rebuilt my Classic 60 Amp which I have owned since New, and now the LS5 MKIII.

Call Scott since the LS5 MKIII is in the Rack, and it is not going anywhere right now :-).

Tell him David L. sent you.

 

 

 

As a long time LS5 II and III owner, who praised these models on here 20+ years ago, I would be hesitant to put a lot of money into this.  If it sounds good to you, then just run with it.  But if you're looking to put $1k into this, I would suggest you consider alternatives.

My line stage progress since then: ARC LS5 III --> BAT 31SE --> Aesthetix Callisto Sig --> Aria WV5XL which I have had for 15 years.  Each change was a significant step up with the last two being VERY significant refinements.  

After you hear these models and many others from Cary, Canary, VAC, it's hard to go back to the LS5 as it is just too unnaturally forward sounding and lacks the energy in the low end.  About 10 years ago I got an old Counterpoint SA-5 for a small apt system.  At that same time, a friend got a used LS5 II as he found a good deal and he knew of my praise of it years ago.  We ran them side by side and the LS5 lost to the SA5 in a flash.  Even his wife in another room asked what we did right when we switched to the SA-5.  He sold the LS5 and got an SA-5 and put money back into his pocket.  I am not pushing the SA-5, and surely you can do a lot better, but I am pointing out that there is so much out there so be careful what you spend on updates.

As for capacitors, here is a cool read: Capacitor Review Test

John