DizRotus

When I started the thread requesting beater networks so that I could cannibalize them for their autotransformers[1] I never expected the pristine specimens sent by forum member lost_at_c. The generosity of the members of this forum never ceases to amaze me. Now the kids in the Birmingham Seaholm High School band will have the opportunity to experience their La Scalas with upgraded networks.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> [1] http://forums.klipsch.com/forums/thread/656939.aspx

Glenn, I'm looking forward to seeing and hearing the Eico and the H-IIIs; you and Verna too. Craig's VRDs would be a welcomed bonus. Inviting the neighbors is a good idea. With the Eico and the H-IIIs you'll be be able to drown out the conversations at Dunleavey's. Craig's VRDs would expand your circle of influence into Monroe County.

Now you've done it. You've convinced me to not waste the time or money on this mod.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> My appreciation of the bass produced by La Scalas and Khorns is similar to your own. I'll gladly trade quantity for quality. If it were possible to get more bass extension from La Scalas without losing the quality of what's there originally, that would be great. Alas, there's no free lunch. Please understand that I love the sound of Cornwalls, but I wouldn't want to sacrifice the tight bass of the La Scalas to get Cornwall-like bass. To some degree the same holds true for Khorns. Many speakers go lower, but precious few sound as good doing so. Many years ago I used 4 Speakerlab SKhorns in a mobile DJ business. The bass from them when driven by a Dynaco ST-400 was very tight. One person called to book a return engagement and wanted to know if the price quoted included the drummer. She was convinced that there had been a live drummer. Thanks for the details. I would have done essentially the same and, I expect, reached the same conclusion.

In the interest of full disclosure, apparently this issue did make "a dime's worth of difference" to PWK. Bob Crites mentioned to me that the screw Klipsch typically used through the air core inductors should have been brass. He was surprised to learn that they were mild steel, but said that sometimes it happened. He then suggested brass or stainless; anything that would not attract a magnet. I already had stainless screws that worked, so a trip to the hardware store to buy brass screws seemed unnecessary. You're correct that stainless screws were not used for cosmetic purposes. It would take a lot more than a few fancy screws to make those networks look pretty.

What Bob said. The magnet wasn't attracted, so I was. And keep in mind that Klipsch used mild steel screws [edit 3/27; in these networks. See below.] to hold down the air cores twenty years earlier and the world just kept a goin'.

Those are the GE caps that Bob sells, just like the ones he sent for my son's Type E networks. You won't be disappointed dealing with Bob. BTW after the "after" photo was taken I moved the caps farther away from the air core inductors. The original screws holding down the air core inductors were steel. At Bob's suggestion I replaced the steel screws with stainless, so as to not affect the air core inductors.

Glenn- Congratulations! Will we hear it make the H-IIIs sing at the party?

Your impressions regarding the bass mod are very interesting. As I'm considering the same bass mod for La Scalas, I'd like to put your impressions in perspective. Others have repeatedly said that no one who tried the similar mod went back to unmodified. <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> Please understand that I'm not discrediting your opinion; you can't be wrong when stating personal preferences. Nonetheless, please provide the details of your modification, e.g., port length, port diameter, stuffing, etc. so that apples can be compared to apples, as much as possible, under the circumstances. Like Craig, Im not surprised that you feel the attributes of the horn loaded bass are compromised by the bass reflex loadingand unloading of the woofer. Its all about compromise. Because its a relatively simple and totally reversible mod, Ill probably do it regardless. Even so, it would be useful to know exactly how you did it so that comparisons could be made to the ways that others have done it. Its refreshing to hear someone acknowledge that the results their latest DIY mod were less than expected. Thanks for your candor.

The autotransformers and the inductors tested perfectly. From an appearance standpoint the rust on the frames is bad but it has no effect on the electrical performance.

If you have experience with OTL amps in general, or the one designed and described by Bruce Rozenblit[1] in particular, please share your thoughts. Im considering such a project.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> [1] Glass Audio, Vol. 2, No.2, 1990 and A Beginners Guide To Tube Audio Design.

After caps, etc. from BEC. Although looks weren't a factor, I also replaced the old barrier strips with new ones that aren't shown in this photo.

After refreshing a set of AA networks for La Scalas with caps from Bob Crites/BEC (see before and after photos below), I didnt hesitate to contact Bob again for the parts to refresh my sons Type E networks. $37 got me new caps, clamps and connectors. Plus youre dealing with a valuable asset to the forum.

They (KLIPSCH la scala PRISTINE- PROFESSIONALLY REMASTERED) look like they were well done, but $2,900.00?

Bill, That candy bar counts. I'm eager to hear your impressions of the newly acquired VRDs/Blueberry and your Khorns.

Is this what you're looking for?

But seriously.. one of the dumbest mistakes I made involved a double date to the Lowell (MI) Showboat c. 1966 to see Bob Newhart. <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> As a junior in high school, I thought the Lowell Showboat was a floating nightclub and that it would be a very sophisticated evening. The guys wore sport coats and ties (and pants) and the girls were dressed accordingly. Instead of a floating nightclub, the Lowell Showboat was a barge that was docked at the river bank in front of bleachers. It was a hot summer evening. We were the only guys in the audience not wearing strap-Ts. Our dates were mortified and thought we were morons. The warm-up act was a ventriloquist with a chicken for a dummy. He billed the act as, The Worlds Foulest Chicken. The jokes were blue, but Richard Pryor he wasnt. Newhart was funny and we had a pleasant time, once we ditched the coats and ties and resigned ourselves to sitting outside on bleachers, rather than at a table in a club. Sophistication and teenager are oxymoronic.

Bill That sure was a Dumas mistake, you Dickens!

I always forget how to spell d'Artagnan. Oh wait, I thought you were asking about Dumas mistakes, as in Alexandre. Never Mind.

I'm looking for a schematic for the networks in c. 80s Heresies with K-77Ms. Also, I want to replace the caps in the networks. What is a good source?

Ditto (I confess I did clear my throat).

Gilbert, There's no hurry, I'm just curious. Is the vault still headed this way? Does anyone have a photo of the vault that could be posted?

Thanks. This proves that I'm educable.

I give up! How does one retrieve PMs on this new and improved forum? The car in the Avatar is a 7 clone with a Buick 3.5 liter aluminum V8; 1800# and 200+ HP; handles like a go-kart and accelerates like a motorcycle, but comfy it aint.

Allan, I just sent you a PM.

I vote for the center one.