mike stehr Posted November 10, 2001 Share Posted November 10, 2001 Howdy! Dear Al K., I received the Chorus II Schematic today. Yup, there is a 68uF cap parallel wired after the 3.5mH choke for the woofer. Then a 6uF cap before a 20 ohm 12 watt resistor (series wired) going into tap 5 of the autoformer, (T5A(6dB). Tap 3+ and 0 (grnd) go to the Mid-horn,(K-61-K). After the autoformer a 1.75mH choke is parallel wired in the mid circuit.(Between mid and autoformer). A pair of 2uF caps,(a blue film foil type) are series wired to the (K-79-K) tweeter, with a 160uH choke parallel wired between the two 2uF caps. (I'm pretty sure that's micro henries, could be a typo maybe). Whats strange, is the hot path from the input of the tweeter circuit. It has the caps in that path, but goes to the negative tap on the tweeter. (like the tweeter's polarity is reversed). The mid-horn must have some pretty high Impedance. Pretty simple X-over, really. Can a guy get a polyprop that big? I guess you could stack smaller values.(Cascode)? 3.5mH's, that seems like a pretty common value. This won't be to tough a project. Mobile, I gotta admire your gear, I never heard any tube gear yet, But I know that all the audio valve maniacs on the net rave on the single-ended 2A3 route. I'm ignorant to valves, but I'll take stab at it. This design evolved way back in the teens or twenties and is real simple. It used the 300B or E Western Electric tube. (Which the old classic original tubes are prized). I think Western Electric made this design. And technically is a distortion device, but the distortion has different harmonics or higher harmonics, I geuss. Most folks don't notice, fools your ears maybe, but they love the sound anyway. This design is low powered and requires very sensitive Horn Loudspeakers. These old designs where used with PIO caps. And why valve folks more than likely prefer Jensen PIO capacitors. This is maybe why Exotic polyprop's and such do not work so well in a classic Single-ended 2A3 setup with horn Loudspeakers. This could be be why some SS amps do not sound too thrilling on horn Loudspeaker's more catered for tube gear, or like using valve's for Scan-Speaks. (These speakers benefit from high-order X-over networks with the high quality caps). More of a speaker for solid state, I guess. This is maybe why JohnsO2 likes Al's Crossovers with his Rotel Gear. Maybe Al's crossovers work better with SS. Maybe it depends on the equipment one uses. But you gotta admit, changing a electrolytic cap for a Solen is better than leaving it. (Whats the life, 5,10 years, before they dry out? MIKE LINDSEY! I just asked Matt At Klipsch To EMail me a Schematic pdf file. I have a flatbed scanner, but I'm not sure how to format it or how it would come out on your side. I'm kind of ignorant to PC's too. If you have a hard time from them, I'll see what I can do, but you should not, there good guys, very helpful. Or call. Did you ever try rope-caulking your chorus II mid-horns yet? I'm curious if it will do any damping with a plastic horn. I'm goin' to bed. THANX! Mike. Quote Link to comment Share on other sites More sharing options...
Mike Lindsey Posted November 10, 2001 Share Posted November 10, 2001 Mike, With your scanner, there should be some software that allows you to Print or Save what gets scanned in. When you select Save, it should create a jpg file and that's what you send to me. If it doesn't work, I'll give Matt a call and have him send me one. I haven't gotten around to rope caulking the Chorus's yet but may still end up doing it one day... Mike ------------------ My Music Systems Quote Link to comment Share on other sites More sharing options...
John Warren Posted November 10, 2001 Share Posted November 10, 2001 Christ! I must be stone deaf......I can't hear the difference between oil or electrolytics, wire or even chokes. You guys are down to preferences in network caps and chokes!! very impressive Jumpin-Geezus!! I can't even tell the difference between tubes and solid state half the time. HEll, I've got a mother EV T-350 sitting atop a Patrician IV and I realized about two weeks it had a broken voice coil lead wire. I only found out because the wife wanted to remove the 3" of dust on it. You guys must be real audiophiles, I admire all of you. This message has been edited by John Warren on 11-10-2001 at 04:29 PM Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted November 10, 2001 Share Posted November 10, 2001 John, Welcome to the club! My General Radio 1608A impedance bridge and I salute you! ;-) Al K. Quote Link to comment Share on other sites More sharing options...
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