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About ra.ra

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  1. Yeah, I haven't yet tried those Bulgarian or Russian rheostats yet, but they appear to have a very good build quality and thusfar, performance reviews have been positive. My favorite project using a version of these controls is in this 2ax restoration by xmas 11. http://www.classicspeakerpages.net/IP.Board/index.php?showtopic=7994 Meanwhile, I will report back after I dig into these A-P pots a bit more.... I tend to think this is probably true, but I can't recall ever seeing a pic of an Ohmite or L-pad with the typical green oxidized corrosion crust we've all seen with the A-P pots. Since they are all exposed to interior cabinet atmospheres with some humidity present and possibly some off-gassing from stuffing, isn't this corrosive problem largely a result of the specific metals used in these control devices? And with regard to the open-back issue, I'll agree that being covered is probably a preferred installation, but I am not aware of any stated problems resulting from crossovers like these early AR-2 variants.
  2. Re-veneering requires much more skill than the spackle-sand-paint approach, and as much as I've grown to appreciate the beauty of the raw pine finish, if I were to tackle a re-veneer project, my choice would be to select a species with a bit more panache than utilitarian pine. Re: black finish, I really like genek's four-step prescription.
  3. It's a lot of work, but my 4x's had a very heavy layer of paint that took three applications of chemical stripper with plastic scraper before I finished up with random orbital and/or palm sander. And still, if you look very closely, there are faint traces of a residual "whitewash" appearance. With such nice grilles and badges (and working drivers?), that's beginning to become an attractive price. Not sure about the pine 5's, but this (birch) face trim on the pine 4x's is very thin so you need to proceed with care. Please....NO!!!...... Don't even think about resurrecting that terrible idea. Yes, I remember this idea from a previous thread. All I can say is you are far more industrious and optimistic than I am - - your color example looks like it might be oak, and I doubt you'd get a similar effect with the pine, but then I have little experience with dye finishes. If you attempt this solution, be sure to first experiment with plenty of sample panels on pine plywood. Next time I have a solid pair with with difficult cosmetic challenges, I'll probably try to make it an easy re-finish and emulate the rare black-and-linen finish that was offered on LST's - - - sort of like this pair of AR-4x's.
  4. Before disassembly, all of them had good physical movement throughout the entire sweep. Electrically, however, although five of them read close to 15 ohms across 1 - 2 tabs, only three were initially showing a fairly smooth progression from 0.5 or 1.0 ohm minimum up through the maximum. I had been hopeful that all six might perform flawlessly right off the bat, but not so.....yet.
  5. No breaking news here, but I just wanted to share some pics of this half dozen new old stock (NOS) Aetna-Pollak potentiometers that I recently found in a vendor's junk parts bin. This is the first time I've encountered this type with the heavy wiper and spring, and I presume these have never been used since there is no evidence of solder on the wire terminals and no real evidence of abrasion on the moving metal parts. Two items of interest. First, even though these have never been used, some of the metal has still developed some degree of corrosion due to 50 years of varied atmospheric exposure, I presume. Second, I was slightly surprised to see that each pot had a small blob of nearly petrified grease near where the base of the shaft meets the spring - - - its purpose was ........??? And just taking an initial resistance reading between the 1 and 2 tabs (15.0, 14.7, 40.7, 15.2, 15.1, and 14.9), the results were as expected except for this one oddball outlier at 40 ohms. Not quite sure yet how I will attack the clean-and-restore tasks, but I expect I should be able to salvage at least two good pairs from this bunch. Thoughts, questions, comments appreciated.
  6. Grilles look good, cabinets are solid, all paperwork intact, but that dark stain really is a shame. It took substantial effort for me to resuscitate this pair of pine 4x's, but I doubt you could ever remove all of that stain that seeps deep into that softwood.
  7. Yeah, that certainly was a steep price. By all appearances, they seemed to be an exceptional pair of AR-3's, but the posting did not even include a pic to verify the drivers or a description to attest to their functionality or performance. What struck me was the contrast between that sale and this other auction that occurred during the same week.
  8. Sorry I couldn't help more with tweeter disassembly - - the pic was not my own work, just an image I cribbed from another thread. And if you've now replaced with a KLH tweeter, not sure I can help there either since I'm not familiar with that model - - it's quite possible it might "work" OK, but it also might be best served with a crossover modification of some sort.
  9. All of these KLH model numbers confuse me, but those two appear to be virtually identical from the exterior. Maybe, just maybe, there might be a slight revision on the inside?.....but enough to necessitate a change in model number? Despite your suspicions about the stenciled "A" on the back plate, the serial number sticker also features the "A", so there is some yet-to-be-determined differentiation between the two. You'll probably have to take a peek inside - - meanwhile here are a few threads which might offer some ideas. From this first link, I suspect what you have is the original grille cloth. http://www.classicspeakerpages.net/library/klh/klh_22_klh_model_twenty-two/klh_22_photos/klh_22_front.html#previous-photo http://audiokarma.org/forums/index.php?threads/klh-22a-speaker-score.720273/
  10. Thanks much for that second AR-4 review - - - I've always been under the impression that the AR-4 debuted in '64, so it's interesting to see that the review in Audio was published one month before HF's review, thereby issuing their commentary before the annual wall calendar was replaced with the 1965 pin-up girls. This review is also a fair assessment, even with the multiple reality-check comparisons with AR's "senior systems". When I read these comments, I have to remind myself that the hi-fi world considered AR's acoustic suspension products as compact (yes, even the 1, 2 and 3 series), and the press was still gushing about the audio performance emanating from these small sealed boxes. Whenever I see the descriptor of a speaker as "listenable", I am unable to decipher whether this is lazy faint praise or the ultimate compliment. Nonetheless, it is enjoyable to see this reviewer's claim that the AR-4 sounds better as the volume control gets cranked clockwise, and I chuckled, and agreed, when I saw mention of 15 watts RMS as being a suitable power requirement. This is a great comment. Many magazines from this era were very sophisticated - - not only in the quality of the text, but also the layout, graphic styling, ad copy, and photography.
  11. Thanks for reply - - my concern was about mostly preserving the dust cap. Would this test tone method also be the least intrusive procedure for re-glueing a loose masonite ring at the spider location?
  12. Kudos for two great instructional pics in this thread from Klaus and Larry. With the 2a cloth woofers, once you've detached the ring, cleaned basket edge and are re-glueing masonite to metal, what technique is used to ensure that the voice coil remains centered as the new glue sets up?
  13. Yeah, these old mags can be a lot of fun to flip through. Not only are they packed with info for gear junkies - - product reviews and advertisements, mostly - - but they are loaded with such an awareness of recording processes and musical performances and are full of great graphics. On the heels of the AR-4 review, the February 1966 issue featured this piece on the AR-4x, along with the 2ax in the same review. And occasionally, they will feature something like this cover article (HF Feb 64) on integrated decor, featuring sliding panels, turntables on trays, and built-in speakers. This is the archive page that is available. http://www.americanradiohistory.com/High-Fidelity-Magazine.htm
  14. Someone with more surgical experience than me should be able to assist, but here's the only pic I have of this driver disassembled. It is very common for the paper cone perimeter to come loose from the metal face plate (see typical line of rust in pic), but I'm not sure how the electrical connection is transferred from the green/yellow wire terminals to the voice coil.
  15. Posting here for general interest - - I just happened to find these pages from January 1965 issue of High Fidelity, featuring my beloved AR-4's. The review is brief, and fair, and praiseworthy. Also attached is an ad from the same issue - - this must have been the original debut of the 3-1/2" tweeter, since it also contains text about the brand new AR-2x and AR-2ax models which employ the same driver. These old magazines are a gas to look through - - it seems like every issue from this period begins with several pages of full-page ads by Fisher and then Pickering, even before the table of contents. This particular issue featured something I had never seen before: a tape recorder made by Dynaco. http://www.americanradiohistory.com/Archive-High-Fidelity/60s/High-Fidelity-1965-Jan.pdf Happy birthday, America!