John Warren Posted October 5, 2015 Posted October 5, 2015 Ok. After how many years? A new autotransformer? And why? For those of you that are in to this sort of thing, I've decided to design and source a new autotransformer. This is uglier than the ones offered by my friends but it is no less capable. It was a design job for a customer and decided to work it into a new network (I own the design and sourced the supplier). There are some advantages over resistor pads but that's another topic for discussion. It's bi-filiar wound and pretty stout. Link to page. http://www.northreadingeng.com/baffle_insert/R2_Klipschorn_baffle_insert.html 4
jwc Posted October 5, 2015 Posted October 5, 2015 John. I had no idea you work on vintage mac!!!. This is great. I have sent stuff to Terry Dewick for years as well as many of my audio buds. I was at Terry's last fall. He is moving very slow.....physically. He gets way behind on work too. It is nice to know of another option for the vintage stuff. I'm gonna spread the word..... great website BTW. ---------------------------- VINTAGE McINTOSH SOLID-STATE AMPLIFIER SERVICINGAlthough vintage McIntosh amplifiers are a well made and durable many of the components in the circuits are life-limited, having lives that depend on hours of use and operating temperature. As parts "field-age" in service, they degrade and the symptoms of degradation manifest themselves as buzzing sounds, mains "hum", noise (distortion) and "loose" bass response. POPULAR VINTAGE MODELS WE SERVICE:AMPLIFIERSMC2105MC2100MC2505MC250MC100 MC50INTEGRATED AMPLIFIERSMA5100MA6100PRE-AMPLIFIERSContact us to discuss your specific needs.TUBE AMPLIFIERSContact us to discuss your specific needs.
John Warren Posted October 6, 2015 Author Posted October 6, 2015 (edited) Thank you sir! Mr. Dewick is a real gentlemen and skilled technician. He's been at it for quite some time. There's really no better way to understand how something like an autotransformer works than to design and test one! My supplier is a transformer company and although they've been winding coils for years, this sort of thing was new to them. Fun stuff! Edited October 6, 2015 by John Warren
DeanG Crossovers Posted October 6, 2015 Posted October 6, 2015 Man, wouldn't it have been easier just to reverse engineer the ones I sent you? Why are you smearing poop on your caps.
Guest David H Posted October 6, 2015 Posted October 6, 2015 (edited) Why are you smearing poop on your caps. LOL Calvin??? Edited October 7, 2015 by GotHover
DeanG Crossovers Posted October 6, 2015 Posted October 6, 2015 Good for killing mechanical vibration. Another one of those things -- are film and foils microphonic? That's why I use oil filled caps, I don't have to worry about it, and no poo!
John Warren Posted October 6, 2015 Author Posted October 6, 2015 Now here's your chance to get into a good technical discussion related to network design and how it works with the horn assembly you take the discussion to the gutter. Nice. Besides, they're sitting in a pair of Klipschorns just outside of Portland, OR so not much I can do about it now.
John Warren Posted October 6, 2015 Author Posted October 6, 2015 Man, wouldn't it have been easier just to reverse engineer the ones I sent you? Because they weren't what I wanted. And what fun would that be, seriously?.
DeanG Crossovers Posted October 6, 2015 Posted October 6, 2015 Nice to know that someone can take a ribbing without melting down like a two year old. Feel like telling us anything about it. I am curious about that material John, does it solidify somewhat, like rubber?
John Warren Posted October 6, 2015 Author Posted October 6, 2015 I am curious about that material John, does it solidify somewhat, like rubber? Dear God man it's just RTV (Dow Corning 732) Black (Christ, next time I'll use Grey).
CECAA850 Posted October 6, 2015 Posted October 6, 2015 I am curious about that material John, does it solidify somewhat, like rubber? Dear God man it's just RTV (Dow Corning 732) Black (Christ, next time I'll use Grey). I'm of the less technical here so bear with me. Is this structural, to reduce vibration or have some other purpose?
John Warren Posted October 6, 2015 Author Posted October 6, 2015 I am curious about that material John, does it solidify somewhat, like rubber? Dear God man it's just RTV (Dow Corning 732) Black (Christ, next time I'll use Grey). I'm of the less technical here so bear with me. Is this structural, to reduce vibration or have some other purpose? It's just to keep them from rubbing, buzzing together. The Silicone rubber can be removed without trashing the caps. I don't like parts rubbing into each other when handled or shipped. 1
babadono Posted October 6, 2015 Posted October 6, 2015 I am curious about that material John, does it solidify somewhat, like rubber? Dear God man it's just RTV (Dow Corning 732) Black (Christ, next time I'll use Grey). I'm of the less technical here so bear with me. Is this structural, to reduce vibration or have some other purpose? Its got to survive the KHorn good vibrations
John Warren Posted October 7, 2015 Author Posted October 7, 2015 (edited) This is the baffle insert that the network was designed for. It's a swap out of the factory Klipschorn assembly. The Selenium horn is a nice unit and reasonable cost. I noticed Bob Crites is selling a replacement tweeter based on a B&C driver. I think that tweeter would be a nice, lower cost option to the Faital unit shown in the photo. Edited October 7, 2015 by John Warren 1
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