What tubes for ARC LS 5 preamp - 6922/6DJ8
WOW this thread is right up my alley. I have owned an LS5 MK II for the last few years. I recently had it at Great Northern Sounds for the Reference upgrade package. I also run it with Amperex white label 7308's. WOW WOW WOW All the beautiful liquid accuaracy but no grain. Not a hint. The bass is meaningful and fast. Soundstage is accurate and detailed. WOW WOW WOW Steve Huntley is a very nice man to boot. He has a great ear and listens to good music. I saw his shop first hand and would recommend him most highly. The LS 5MK II deserves to have this upgrade done to it. It is already a classic and this modification lowers the noise floor and tweaks an already advanced platform. It is world class all over again. No fatique but not mushy. The 7308's are a must for this pre. It sucks to have to come up with 10 NOS tubes at retube time but the sound is worth the insanity. The telefunkens sound quite good too. Happy hunting. |
Hello John and thanks ALbert and Ed John, good seeing you here again and thanks for all the preamp advice. I bought the LS5 mk II a year ago and love it actually I am looking at Steve Huntley of Great Northern Sound to upgrade my mkII. http://www.greatnorthernsound.com/home.htm Steve does significant upgrades to the ARC products. Steve used to work for Audio Research in the design phase and does significant upgrades to ARC, Wadia and other high end pieces. His philosophy is that ARC made some cost saving corner cutting and newer technology exists to make these pieces sound significantly better. Steve is from your neck of the woods in Minnesota and is very helpful. Send him an email and find out about his mod program. I have a friend who Steve did a mod on for his LS22, it was much more open and musical than the stock unit. He also is a big fan of the LS 5 in the chain of ARC products. cheers Tom |
Good to see you here again Tom. When I got my first LS5, the MK II, I put in RAM Labs 6DJ8 that I had purchased years ago for my SP10. The RAM tubes added a little more warmth and smoothness to the stock LS5 tubes at the time....I am not sure if they were sovteks then....this was early 1995. You might want to contact RAM to see if they still have such tubes. http://www.ramlabs-musicreference.com/index.htm A few years later I tried the Amperex and these worked well but I do not recall much of an improvement here. I bought these from a private party so perhaps they were beyond their prime. And so when a couple of these died, I ended up buying the Sovteks and the LS5's character was pretty much the same. Just last year, I was able to audition the MK III against my MK II in my home as a local audiophile was looking to sell his MK III. And we compared to his LS22 also in my system. It was quite interesting to jump between the 3 preamps, all warmed up a couple hours before listening. As Albert refers to the other tubes murdering the Sovtek, both LS5s did this to the 22, and then I would say the MK III severely wounded the II. The III amazingly enough had all of the II's midrange magic in tact and yet the III had far more resolution in the lower mids, but more importantly, the III had a natural top end. Unfortunately the II has an exaggerated top end with too much sibilance. After listening to the III for awhile, it was truly difficult to return to the II.....and I had owned a II for 5+ years. The II however did seem to have more extension in the bass .... perhaps this too was exaggerated. So my point to all this is, before you go out and spend a fortune on tubes, you might want to keep your eyes out for a III. I might even go out on a limb and predict the III with the Sovteks would beat the II in any tube configuration. Albert may rightfully so correct me on this, but the sound of both units with Sovteks was similar and yet the III was clearly in a whole new league. I can only imagine what the III might sound like if Albert and Ed are correct about the other tubes. I just might give Ed a ring too! Happy to see you finally said adios to the LS2. Right on! John |
Be careful with the 7308s in the LS5mkI/II. I tried the Amperex 7308 gold pins in my LS5mkII and they rang like a bell. And these were brand new NOS hand-selected low noise/microphonic from Kevin Deal. Nothing at all wrong with the tubes. There's some sort of plate current incompatibilty going on there. I would stick with 6922s for your LS5mkI/II to be safe. But don't be so quick to dismiss the Sovtek 6922. I've used a lot of different 6922s in my LS5mkII. The Sovteks are quite good. Another decent less-expensive NOS 6922 is the JAN Philips. |
Unfortunately this is a very difficult tube to get as NOS and the ones that sound good are continuing to increase in price. There are no good new 6DJ8 / 6922 / 7308 tubes being manufactured (in my opinion). The Amperex 7308 may be best for your needs. This was a military tube, stunningly clean, very fast and very low distortion. When I owned ARC it was my overall favorite. The only other choice might be the Siemens E288CC. I have a bunch of these and run them in certain audio gear, not sure if the ARC will "digest" them though. For the Amperex (USA) 7308, contact Bruce Wenger at BWS Tube. 703-536-3910. He has a large supply of the Amperex and E288CC Siemens as well. He may know if the ARC circuit supports the Siemens. His web link below: http://www.bws-tube.com/ |
