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teknofossil

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  1. After the Watco stain is applied the manufacturer recommends a 72 hr drying period before applying a poly type finish. I am probably next going to replicate the grill cloth frames. I have all of the parts including new transistors for the equalizer. I am hoping to not replace to funky water tower shaped transistors, but if I have to I have 20 fresh stock, all from from Mouser. I am going to try polishing the RCA's and treating them with Cramolin contact cleaner and preservative. -Tom
  2. https://deercreekaudio.com/products/eq901b-v-vi-bose-901-equalizer They program the MiniDSP with the response curve that duplicates the Series 5 or 6 equalizer. Disadvantage is there is no adjust-ability which allowed the user to better integrate the system with their room. Of course you could add some other type of equalizer to do this but then you'd likely be over the price of a real replacement equalizer.
  3. Happy New Year all! I finally got to start to apply the finishes. After trying various stains I have around here I settled on a blend of Watco oil stain. I used about 2/3 black walnut and 1/3 mahogany. Watco suggests flooding the surface with the stain using a brush, letting it soak the wood for a while and then rub off the stain until the wood appears dry. Then apply another coat and doing the same. Below is the "real" 901 cabinet with "wet" Watco. Next is both cabinets and finally the equalizer cover. Not sure what the final finish will be. Either wiping poly or oil. Both have their pluses and minuses.
  4. Hello, the link below should give enough information for the basic material from which to make the frames and the dimensions for creating grill frames. http://www.classicspeakerpages.net/IP.Board/applications/core/interface/file/attachment.php?id=10828
  5. I understand your point about the burlap. I am keeping an eye on the web for something more suitable. I bought a couple yards of the burlap since it is dirt cheap. I am thinking about doing a test on one of the 901 drivers with my Omnimic, without any grill, with the original grill and then trying different types of grill material. Just curious. about the result.
  6. Update on the 901 project. Cabinet veneer work is complete except for finish sanding, staining of the walnut and whatever I decide upon for a finish. I read somewhere Watco Danish oil was used. Can anyone confirm that? All of the 901 original and series 2 seemed to have a dark stain applied. Almost a mahogany like color to the walnut. Later 901s seemed to have only a dull clear finish resembling the natural unfinished color of the walnut veneer I purchased from Woodcraft. Also, the equalizer, which has a walnut veneered cabinet had deep scaring and water stains on it so it gets the Full Monty treatment as well. In case anyone hasn't noticed, I took artistic license here and mirror imaged the front baffle of the clone speaker cabinet. Grill cloth. No luck finding any "official" grill cloth. Closest thing is beige burlap. Bose put a fine black mesh between the (outer) grill cloth and the Masonite frames. Not sure what the logic there was. -T
  7. Below is an image of two of the 901 drivers I have. On the left is from the one "authentic" 901 (so called series 1) and the series 2 is on the right. I have recently seen some images of different series 2 drivers. Cabinets were marked series 2. Drivers had round magnets but the diaphragms were black (like the series 1). As you can see my drivers have the Bose logo printed on the cones. I have also seen the same CTS looking drivers sporting blue cones with out the Bose logo printing. These drivers had dust caps embossed with Bose in the dust caps. No idea if this was decorative or there were performance enhancements.
  8. Does anyone have any idea who supplied the grille cloth for the original 901 systems. I know this is a "stretch" for someone to recall something trivial like this. I have the original grilles but to help match something but I'm looking to narrow my search.
  9. I had a set of Ohm Model G used from a strange fellow who had a used audio shop in Northampton MA. Had a lot of bass with the upper ranges tilted downward, balance wise. I had the equalizer which actually compensated for this sonic effect, decreasing the bass and increasing the upper ranges using a 3 position slide switch. A friend in Wilbraham MA bought them from me in the early 80's. I recently asked him about them. Apparently the foam surround rotted and they made rattling sounds. He jokingly said I can have them back if I want to dig down through 20 feet of trash in the local land fill.... As my wife's English nurse says: "Bugger"
  10. Ok, I am a fan of long gone original New England audio manufacturers. After all, I'm a New Englander so there is some "home team pride" that has it's hooks into me .(FYI I am a techno geek of sorts and have little interest in Red Sox, Patriots, Celtics, the Big E and so on...only audio / historical cool stuff like Springfield made Indian motorcycles, Gee Bee race planes, Rolls Royce cars, one of the first commercial radio stations, WBZ in the US, all those computer and electronic companies). I have been a fan of the Bose 901 (along with 3 way AR's and Allisons) for a long time. No, I don't believe it is "the best" as some early adverts from Bose would suggest but they were a cool concept, still are actually and despite the nay sayers when set up as recommended, when operated within the power capabilities of the amplifier and the equalizer is operating properly and in spec they sound impressively good. A few years back while poking about on Ebay I spied an original Bose 901 equalizer. Bid low and won it, thinking I'd maybe do something with it and a pile of series 2 drivers I had siting in my storage room. But all of it ended up collecting dust as other projects came up. Moving on a few years this past October I saw a single original 901 with a few dead drivers for 50 bucks. So, I have decided to copy the cabinet, utilize the series 2 drivers, restore the equalizer and then perhaps give the completed system to my brothers son who is somewhat of a retro tech guy. Below is the original system with the drivers removed. With a set of verniers and gauge blocks I determined the original 901 cabinet side walls were 1/2" plywood. Angled rear panels are also 1/2" plywood. Front panel is 3/4" ply. Top and bottom panels are 3/4" total thickness, veneered particle board, both sides of each panel. Linen covers the front and rear of the fiberglass filling inside the cabinet. Turns out the equalizer is very early production. Some indications of this are Philips head screws to hold the RCA jack assemblies to the chassis, date codes on some of the caps appear to show 1967 mfg dates and the transistors are the early 2N3393 types (later were 2N5088). There were 2 versions of the original 901 circuit board according to the Rainy City Audio website. Below is the initial production board per their info. More later...
  11. My concern would be that since these were crushed by impact with some object-surface, was there damage to the voice coils / formers ? No way of knowing by looking at them. Personally I'd be asking for a refund and my money back unless the seller was willing to return a serious amount of cash. Considering what it would cost to put these systems right. Just look at the prices of Allison tweeters on Ebay.
  12. Carl helped me out with a few projects over the past few years and rescued me when I couldn't log into my Classic Speaker Pages account. I visited him a couple times in the last few years to listen to some of his projects and adopt his AR3a's that were used to develop his own upgrade to that model AR. I will miss him. GOD speed Carl. -T
  13. So the internal crossover of the stock AR1 and the crossover built into the Janszen module compliment each other? -T
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