tomlang
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Posts posted by tomlang
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There absolutely are some differences! The appearance is different...the chassis color is gold not silver, and there are several misspellings...including the brand name as I pointed out.
But the circuit is 100% identical...it uses exactly the same parts with the same values and behaves the same way as the original. But you certainly don't have to believe it. Just because you don't think it is the same doesn't make it not so...especially since you have taken no effort on your own to disprove it.
And why would Customs seize it? It is a old tube circuit that was patented in 1949. Nothing about the intellectual property here is proprietary anymore.
Carry on.
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The clone is 100% the same circuit as the original. In fact, bench tests suggest the clone outperforms the original.
I have both an original here and am building a clone using the same parts included in the finished clone except for the power transformer.
https://audiokarma.org/forums/index.php?threads/mcintosh-mc275-clone-build.1032698/#post-16483826
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For pickup in Augusta, GA only. $250.
Here is the thread where these started out. http://www.audiokarma.org/forums/in...similar-to-classic-3d-model-and-build.380361/
These are "corner" versions of the University Classic speakers. They sit on a roll around cart and can be taken off of the cart. These have Eminence Legend CB15 woofers, Beta 8A mids, and CDX1-1010 compression drivers on horns. They are complete and the crossovers are inside. These are large speakers each about the size of a refrigerator. The bass bin simply sits on top of the rolling carts. I have no room for these in my new house in Asheville, NC.Here are the measurements in inches:
height with stand: 50
height without stand (just spkrs): 31
depth: 26
width: 38
They require a large room. They are definitely 'far field' speakers and the more space between you and the speakers the better they sound. These were my garage speakers and I usually powered them with a 35 wpc tube amp. One time I put 300 watts thru them. We heard them several blocks away.
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A 5814 is a 12AU7 variant, not a 12AT7.
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Message sent, I have a MC225 for sale.
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Horatio, excellent research and summary! If you get the Crites, I will anxiously await what you discover!
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The bass is kick in your chest kind of bass, not home theatre low but low enough for music it seems to me. At least as low as some Altec Valencia's I once had.
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I had good luck with the Eminence Legend CB15 in my University Dean (not a Classic, but very close) build. As noted in the link of the build below, I used an extreme slope crossover from the woofer to midrange. I lack measuring equipment but the amount of "highs" coming out of the horn through the Eminence woofer was substantially more before attenuating them with the 600 Hz crossover.
http://www.audiokarma.org/forums/showthread.php?t=380361&highlight=university+dean
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What is a Golden Jubilee -- a factory built Jubilee?
One thing I noticed with the University Dean speakers I built -- one 15 inch woofer, no passive is the incredible amount of pressure generated inside the doghouse. If you set the panel on real loose or leave out any of the screws it will either rattle like hell or send alot of air in and out of the holes.
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Yikes, my aching back! Just what do you suppose that Monster weighs with all the drivers etc in it? I'm guessing north of 150 lbs!
Nevertheless you can always climb in it and use it as the sign suggests...
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Lord of the Rings
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Heli, PM sent. On a related note, have you given any consideration to your mid and/or hi drivers at this time?
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If you like I can cut those spacer rings out in a few minutes on my CNC machine and send them to you. I need ID, OD, and if you want the holes drilled the spacing for those also.
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If you got the space (sounds like you will when the shop is done) I may be able to bring the University Deans I am finishing up to compare. I'm about 3 hours from you so not too bad.
What are you using for HF units? I cannot recommend highly enough the midrange and HF unit combo from QSC as used on the SC-2150 http://www.qscaudio.com/products/speakers/dcs/dcs_sc2150.htm. The crossover is dead simple also.
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1. Excellent job!
2. I will have to order a Kreg today.
3. Will you finish this one and test and/or modify before starting the second one?
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Glad to hear from you again, it sounds like the project is coming along nicely. Frankly, I think posting this over at Audiokarma would generate alot more responses than here. Sure, they may be more generic over there along the terms of horn speakers, etc. but I think it would serve your project better.
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I'm really looking forward to seeing this project come together. I hope you post a few pics (jpgs) of the CAD files so we can get an idea of what it will look like. Is there a 3d model?
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I probably should have posted my Dean build here but I hate having to post multiple places. Here is the link to it on AK. It involves a 3D model I did in google sketchup and then machining it with a Shopbot CNC machine. All panels interlock with another via slots. I added a central reinforcment panel as recommended that also supports the mid/high horn.
http://www.audiokarma.org/forums/showthread.php?t=380361&highlight=university
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Nice work. Am I seeing screws holding the wood panel to the spoilboard? Are the parts now loose or did you leave "tabs" to cut manually? Will this have a "curved" front?
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Hello Tom and welcome. Please do not be offended as this is not my intention at all. I know this may sound odd, but I am not really at liberty to discuss the plans and wish to respect that. I do not believe these to be "standard" plans floating around out there. I will say that I did use full corner reflectors as seen in the pictures.Could you take a minute and discuss the plans you used? Did you use the "standard" plans floating around the web? Did you put full corner reflectors at the first corners (looks like you did). Any other hints and kinks of the build?
One thing I will say is one would obviously want the work/assembly surface to be as dead on flat as possible. Just one joint out of square(especially an early, interior one) would compound itself into becoming un-manageable as you work your way outward during assembly. Nothing anyone has not thought of but worth mentioning nonetheless. I picked up a used 4'x8' assembly table from a local cabinet shop. The surface was very uneven when I put it in my garage. Before I leveled it, during dry fit the cabinet would have been twisted almost 3/8" from one side to the other. Just try and install a top and bottom on THAT cabinet.Thanks alot for your perspective. I totally understand and am glad you posted this awesome build. Thanks again.
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Could you take a minute and discuss the plans you used? Did you use the "standard" plans floating around the web? Did you put full corner reflectors at the first corners (looks like you did). Any other hints and kinks of the build?
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Best price I found on the BMD-750 is here at $119. http://www.loudspeakersplus.com/product/BMD750.8/P-AUDIOBMD7508/
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Old Thread Alert! -- sorry to revive this old thread but I can't leave the idea of building a set of University Classic's alone, and furthermore, can't seem to find a more recent thread anywhere that goes into as much detail as this thread.
1. Were any University Classic's or Dean's built, either as stock plans or with the revised reflector angles?
2. Were any revised plans or CAD drawings made public?
2. Was it ever determined if the University Dean approximated a curved horn and, therefore, did not need any reflectors?
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I went through the same research and concluded the same you did. However, I found it curious I could NOT find any JBL 4525 horn info on their website or historical archives...
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Why buy a Mc 275 when you can have one of these!
in Talkin' Tubes
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You are correct again. These are copies of the McIntosh transformers made in china, at least they were shipped from there.
There have been many companies making exact copies of old tube transformers. Dynakit, Magnetic Components to name two.