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ar_pro

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  1. Of course, it's Kent....I knew that.
  2. Crutchfield has the NAD C316BEE ($379) as well as the Onkyo A-9150 ($500), and these are nice, reliable medium-powered integrateds with phono sections; they'd be a good match with the 2ax. And the companies will probably still be in business for awhile, unlike some others. If your friend is looking for a little more power, Crutchfield also has the Yamaha A-S501 which is rated at 85 watts/channel for $550. For even more capability, B&H Photo offers some excellent prices on high-powered Crown, Behringer, and QSC power amplifiers, but then you'd need a preamp. Buying vintage is fine if you have the repair skills, and patience. But I'd have to respectfully differ with Ken on the venerable AR amplifier, which I'd be reluctant to leave plugged in unattended.
  3. Kutztown?

    I envy those those who can easily get to Brimfield, or the MIT flea markets - it looks like the epicenter of speakers from the Classic era. A member of the radio club that hosts the Kutztown event has posted photos from this weekend - I spotted the bulldog in the stroller on Friday, and laughed out loud! https://john-h.smugmug.com/Kutztown-Radio-Meet-XXXVIII-Double-the-Fun/
  4. Kutztown?

    We were there pretty early - around 7 AM, and stayed until about 10. There are very few smokin' deals at that hour, but arriving early is the best way to have a shot at an exotic rarity. The other side of that coin is that some dealers don't set up until the afternoon, so you'd miss them by showing up at dawn. The seller with the ES turntable was the same guy who had that beautiful AR receiver & cabinet a couple of years back - the one that wound up on eBay about 24 hours later.
  5. Kutztown?

    We rolled by on Friday, and it looked like a full house. I spotted a couple of AR turntables, including a later ES version, as well as a few sets of AR-4 types, and a pair of AR-2ax. Dynaco was everywhere - I think there were half a dozen Stereo 70s for sale. I bought a bunch of LPs, and wisely managed to talk myself out of an Altec 604. Did you see the KLH radio, Kent?
  6. “ AR-LST, after Forty Six Years of Use”

    Realizing, Frank, that you haven't exactly solicited an opinion, in the spirit of AR-brotherhood, I'm inclined to give one. Considering the quality of the equipment that you own, as well as the time & energy devoted to bringing this excellent audio system into being, it would seem that the most straightforward, effective, and long-term solution would be to by-God first get ONE PAIR of AR-LST speakers into 100%, full-spec, no-shortcuts, working order. It's wonderful that you'be been blessed with multiple LST's but it's also a little bit of a curse, in that the inclination is to never give up the stack, and to keep everything "functioning". The perfect being the enemy of the good, you now find yourself with multiple AR-9 tweeters, and add-on Microstatics as part of the solution to keep things rolling. From a distance, it looks as if you're maybe not thinking this through, since - and as has already been noted - member Chris1 can repair AR LST tweeters! The stack can wait - in my humble opinion, one restored & perfectly-functioning set of LST's might be the true gold standard.
  7. “ AR-LST, after Forty Six Years of Use”

    One of those stacks is listing to starboard....
  8. “ AR-LST, after Forty Six Years of Use”

    I've never had my paws inside of an LST, but I have compared the sound of an AR-3a against a stock AR-91, and my little AR-91/AR-3a project from a couple of years ago, and I can say that I can definitely hear differences between these three systems. I've always loved the sound of the 3a, and by extension the rare LST, but I have a preference for the characteristics of the AR-9 series systems, which generally seem less reticent, to coin a descriptor. And I think ra.ra's caution to go slowly is advisable, and Frank should consider if he'd be happy with LSTs that have AR-9 DNA in their high end, as well as consider the cautions regarding the AR-9 tweeter's ability to properly cross over to the LST's mids with a newly-capped, but still stock network. In a nutshell, I think that with this change, there'd be a good chance that they would not sound exactly like brand-new LST's, nor even what Frank has grown accustomed to over the years. Also, does an "intermittent thump" sound like a speaker problem? If it's shared by all of the LSTs, I'd think that it was a source issue.
  9. “ AR-LST, after Forty Six Years of Use”

    Just a thought, but how about keeping one pair of LST's in their present condition, while working on the other set? Simultaneously restoring four of these speakers, especially under less-than-perfect conditions is asking a lot. And if I could make one suggestion, it would be to find as dedicated a work space as possible - basement, garage, spare room, etc. - some place that will allow both room to work, store your tools & parts, and provide a stable platform for these heavy speakers.
  10. “ AR-LST, after Forty Six Years of Use”

    This is an excellent point. The 3-way AR-91 crossover is at 7500 Hz.
  11. “ AR-LST, after Forty Six Years of Use”

    This sounds like a terrific project, Frank - please take many photos along the way! To the best of my knowledge, the tweeter is identical in the AR-9/90/91, but one difference in the AR-9 tweeter is that it doesn't have the dispersion characteristics of the AR-LST/3a model - it tends to be more directional in nature. I also think that Larry is correct that this tweeter will have more output than the original LST tweeter. Stimpy's suggestion of Mundorf caps sounds like a winner, especially with a superb speaker like the AR-LST.
  12. Kutztown?

    We've loved going to Kutztown over the years - the radio collectors are maybe a little less fanatical than vintage audio buffs, but they're still a lot of fun to be around. Many of them happen to know a quite a bit about our hobby, too. Renninger's has tightened up on early admissions by restricting the area to "Dealers Only" on Thursday; civilians used to be able to infiltrate on set-up day, and get early access & deals. One my favorite Kutztown memories is buying a pair of AR-90s from a guy who had just purchased them from a dealer only moments before - he hadn't even tried to move them, yet. I offered him twice what he'd paid ($75), and he thought about it for maybe five seconds, and then stuck out his hand. The dealer couldn't believe what had just happened!
  13. Bought one pine early AR3a.....

    Well, that just looks fantastic - very impressive! That natural, unstained look is really appealing.
  14. Good workout for the 3A

    Dyna had a very distinctive appearance, from the original brass/painted front panels of the tube preamps and tuners, through to the champagne and then silver flanged aluminum panels of the later models - it was a great look. Their optional walnut cabinets were also beautiful, and well-made. The IC-150 is on the large side....Crown produced a lot of equipment for industrial/professional use, and pretty much everything they built had rack-mount dimensions.
  15. Good workout for the 3A

    The ST-150 power supply is really robust - it might have been some trickle-down from Dyna's ST-400 super-amp. Like Kent's technician, I've always felt that the 150 was Dyna's best-sounding solid-state design. My Significant Other's old college system was a pair of Advents driven by the little Advent receiver, and we wound up using the receiver as a preamp for the Stereo 150, with excellent results for years & years. When I bought the ST-150 kit, the shop offered me a terrific price on an assembled PAT-5 preamplifier. I had one friend who'd built his own PAT-4, and I flipped it to him. He also had a very slight hum problem with his PAT-4 that he could never fully resolve, and wound up really liking the PAT-5. The Crown IC-150 is another preamplifier from that same era, and was as dead-quiet a front end as I'd ever heard. If you can't resolve the PAT-4 issue, maybe take a peek at the Crown. Ken Rockwell did an excellent write-up on the IC150, which can be seen here: https://kenrockwell.com/audio/crown/ic-150.htm
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