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The Klipsch Audio Community

Technical/Modifications

Talk about updating & modifying older speakers and other technical/electronic information here.

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  1. Jubilee Schematic for passive crossover 1 2

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  2. LaScala tear down

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  3. Heresy HDBR 1 2

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  4. La Scala build 1 2

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  • Recent Posts

    • I also use a class D amp with Forte 3. NuPrime IDA 8, actually a class AD. Sounds absolutely magnificent. I heard tubes in all kind of setups and was never impressed, didn’t really get what the fuss is about. Those glowing tubes sure give a warm and fuzzy feeling, but sound wise...hmmm...
    • Sadly all that made no difference. I corrected the LF response even further by adding 1uF below the 8k shunt feedback capacitor, to reduce the gain to unity at DC and from about 10Hz down, which is how I think it should really be, but that didn't help either.   So I am presently considering the good old silicon rings around the 6SN7s. Curiously enough there is a brand of these called Cary ...   I also rolled off the HF response by adding 22pf (or possibly 220pF pF, can't remember) in shunt at the input, 10K grid stoppers between the volume pots and the V1 grids (instead of the wires, easy enough), and 15pF across the 100K feedback resistor, which should all help with the AM reception while still keeping it reasonably wideband at 100KHz (was nearly 1MHz). AM break-in only happens at the customer site so I can't verify that at present.   To document the gain arithmetic above: the gain of the grounded-grid stage is given by 100/4.7 ~= 21, divided by 2 because of sharing the cathode resistor with V1A, which halves the current and therefore the plate voltage swing, so about 10.5,  or ~20.5dB. This is A in the general formula for gain: A/(1+beta*A), which is used when where A is not large enough to ignore, so taking beta as 8/100 this yields closed-loop gain of ~5.7 or 15.18dB. This is still a little high for the customer's equipment, so I actually increased the 8K resistor to 10K, which yields gain of 5.14 or 14.24dB.
    • If all the other system components are identical between his and yours then it matters little which path you follow.     I'd bias the scales toward the later method, probably, in the event of actual sameness of drivers and xover coil / cap values.  If the reason they'd changed wasn't merely cost-cutting it would stand to reason to be the better choice. 
    • A client and I were talking audio a few days ago  He said that I need to have a listen to one if his favourite artists  Blues genre - R.L. Burnside     
    • I am starting to add some more records.  Buy all the records below for $30 shipped US Media Mail.   Ringo Starr - Ringo SW AL 3413 includes booklet nice VG/VG $6   Ahmad Jamal - Happy Moods ARGO LP-662 1" long, 1/2" high "TAPCD" written on top right corner, name & 1964 written on back cover VG/VG $4   Ahmad Jamal - Jamal a the Penthouse CADET LP 646 VG+/VG+ $8   Bawdy Songs and Back Room Ballads Vol. 1 Sung by Oscar Brand Audio Fidelity AFLP 1906 NM/VG+ (small SLOANE written lower left corner $6   Milt Jackson & Ray Charles - Soul Brothers Atlantic SD 1279  (green & blue label) nice VG/VG+  (foil "STEREO DISC" on cover) $8   The Best of Duke Ellington and His Famous Orchestra Capitol  SM 1602  (re-issue, yellow label) NM/VG+ $4   Cannonball Adderley with Sergio Mendes - Quiet Nights of Quiet Stars Pickwick SPC3255 VG/NM open shrink) $4          
    • So now they both amazing, right?  Button them up and rock on!
    • Saw it twice in the UK and three shows on the West Coast. Front row in Vancouver, The two guitarists are very good.  
    • Really?  Interesting.  What are their dispersion patterns, then?
    • US 129 " The Tail Of The Dragon " out of Deals Gap NC . The hectic nature of 318 turns in 11 miles just puts me in a happy place . My favorite place in the world so far .  
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