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Posts posted by seti
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I always wanted one for nostalgia sake. I haven't heard one in years. If it is fully functional 200 is worth a shot.
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The sun and fisher gear are real winners. You can't beat a good 2a3 amp.
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What do you think about the RCA classic dual plates versus modern production mono plates? I've tried the EH, Sovtek, and a few others. I love the history and the quality of RCA 2A3 tubes I have a bunch of them.
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22 hours ago, sunnysal said:
Brook 12a or 10C schematic was at the core of this IIRC. warm regards, T
This is a PWK design that was found in the archives circa 1946. There were some modifications but nothing that took away from the overall design. Parts have improved. Pretty interesting.
There was also a phono stage found but that is for another day...
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10 hours ago, Deang said:
You are listed as an Officer/Trustee. How are you allowed to participate?It makes more sense to raffle them again.
I wasn’t inferring anything was rigged, just that I didn’t understand the decision to buy tickets, knowing ahead of time you’re not going to keep them.
We are allowed to support the museum through the same process as everyone else. I support every fundraiser of the museum. I purchase from our visitor center gift shop when in Hope, online store, brick campaign, auctions, and also buy tickets to all our events whether I can make attend or not. I don't see a problem.. I would think it more strange if we didn't put our money where our mouth is. The museum is not rich and needs all the help it can get.
We have a new free fundraising platform for the museum that includes a digital ticket system and auction system that we have been testing. If it works out this all our processes will be much more streamlined. The feature I like best is the ability to do online streaming of classes and events from Hope. The hard part will be getting a stable connection to do this. This will be part of the testing.
To everyone who came to Hope or supported the museum through buying from our giftshops or tickets or campaigns thank you so much for all your support. The museum would not exist without you...
https://boardsource.org/resources/personal-contributions/
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4 hours ago, MMurg said:
As usual, the latest Chief Bonehead class, La Scala Reborn, was a fun and informative event. We spent the day learning about and listening to the upcoming La Scala AL6 with Klipsch Principal Engineer Roy Delgado. We also learned about what changes are coming for the Klipschorn AK7, but the prototypes were not fully assembled and there wasn’t time for additional listening. If you have a chance to attend any of these classes, you really should. They are fun and help fund the Klipsch Museum of Audio History (https://www.klipschmuseum.org/). Even if you can’t attend, consider donating to the Museum or even becoming a member to help them continue preserving Paul’s legacy and promoting STEM education. Commercial over, now onto the class information.
Here are the upcoming changes to the La Scala and Klipschorn. Remember that this is preliminary information subject to change.
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New midrange horn and driver (La Scala and Klipschorn)
The reason that the La Scala and Klipschorn are being updated at this time is because the tooling for the K-401 midrange horn is finally wearing out. Instead of making new tooling for that old exponential horn design, it was decided that it would finally be replaced with a modern modified Tractrix horn, designated the K-406. This new horn is much shorter and features a 2” throat and “mumps”. The next change is the midrange driver to go with this new horn. This is the large diaphragm, 2” exit KT-1133-HP compression driver used in the Klipsch Professional line.
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New tweeter wide dispersion phase plug (La Scala and Klipschorn)
All compression drivers will start to beam at a certain frequency as the frequency increases. The frequency at which this happens depends on the driver’s exit diameter. Once this happens the horn no longer controls the coverage pattern. A phase plug is then needed to control the coverage past this point. That is why wide dispersion phase plugs were added to the high frequency assemblies when the Heresy, Forte, and Cornwall were last updated and why the Heritage Jubilee has always had one. The La Scala and Klipsch will now join the rest of the Heritage line with the addition of a wide dispersion phase plug to the tweeters.
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Revised bass bin with horn-loaded vented system and different woofer (La Scala only)
In order to get additional bass extension from the La Scala, Roy decided to experiment with using a horn-loaded vented system design like the Jubilee bass bin. After experimenting with various port numbers, he settled on two ports. These are the same ports used on the Cornwall, Heresy and RF-7 III. Since there is only so much space on the woofer baffle, the woofer size had to be decreased from 15 inches to 12 inches. However, this is no ordinary 12-inch woofer. It is the same woofer used on the Forte IV. It has a larger voice coil (3”) than the 15. Since the ports contribute to the effective radiating area, this combination actually has lower distortion than the sealed 15. Doing this netted an extra 10 Hz of bass extension.
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New crossover network and optional DSP (La Scala and Klipschorn)
The original intent Roy had was to forgo a passive crossover and only do an active DSP like the Jubilee. However, some people thought that sales might suffer if buyers were forced to buy six channels of amplification for stereo when only two are required for the current La Scala. So, now the La Scala AL6 and Klipschorn AK7 will ship stock with a passive network and the DSP will be a separately purchased option. The new passive network will be fairly complicated since Roy tried to accommodate as many of the PEQs, etc. used in the DSP as possible. It’s so big that the production network had to be put on two circuit board. However, the real magic comes with the optional DSP. This allows time/phase alignment of all drivers. This also allowed the response to be really flattened out. However, this also means that the new La Scala and Klipschorn will require three channels of amplification per speaker when using the DSP.
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Upgrade kits (La Scala and Klipschorn)
The plan is to have upgrade kits for both the La Scala and Klipschorn. Any upgrade kits that might be offered would probably only be for the La Scala AL5 and the Klipschorn AK6, since only those versions have the Celestion tweeter with the front-mounted horn that will be carried over to the new versions. The kits would include the passive networks and the DSP would still be an optional purchase. The La Scala may have two versions of the kit. Since the woofer baffle has been changed, to do a full upgrade would require replacing the entire “doghouse” in the bass bin. So, there may be a kit with the doghouse and one without. If you pick the one without the doghouse, you will miss out on the additional bass extension but still get all the other improvements.
How do all these changes sound? Well, we began the listening session with the La Scala and the passive networks. These sounded good. You could definitely hear the extended bass and the smoother midrange. You could be happy with these without a sub, depending on your musical tastes. The hint of shoutiness from the K-401 mid-horn is completely gone. However, there was little of the magic I heard back in March when we only heard the ones with the DSP.
Once Roy switched the setup to the tri-amp DSP configuration, the improvement was astounding. The bottom end sounded even fuller, the speakers sounded smoother, better integrated, and more like single sources. The improvement is as dramatic as when I head the comparison of the Underground Jubilee and the Heritage Jubilee. The sound was as close to the Heritage Jubilee sound as I’ve heard from any other Heritage speaker, just at a smaller scale and without the ridiculously deep bass of the Jubilee. These are not your grandfather’s La Scala. I imagine the improvement will be similarly dramatic with the Klipschorn as well. Purchasing the new La Scala or Klipschorn without doing the tri-amp DSP setup would be a monumental mistake in my opinion. The sound with the DSP is so much better. I can’t wait for these new versions to be released.
The event was capped off by an evening at the Klipsch Museum Victor Center of enjoying Roy’s famous grilled fajitas and chicken and live music with the Dusty Rose Band.
Edit: I forgot to mention that Klipsch is currently planning to launch the new La Scala and Klipschorn at the end of February of next year (2025).
I was going to do the same thing but you did such a great job there isn't anything left to say. Thank you so much for coming down. Thank you so much for your support of the museum. It is people like you that keep the museum going. You rock. Thank you!
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New midrange horn and driver (La Scala and Klipschorn)
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1 hour ago, mark1101 said:
I admit communication for those not in attendance could have been a little better. But the museum events are staffed and run on volunteerism. I can't overemphasize how hard the volunteers worked to prepare the Visitors Center, the food and refreshments, the stage and PA for the band, the lab and class, and cleanup. I'm sure I'm missing a whole lot here.
Roy not only spent the whole day teaching about the new AL6 Lascalas and with no lunch, afterward came to the Visitor's Center and grilled steak and chicken for everyone.
Thank you Mark for coming all the way to Hope and for your help and time. It was great to see you again. We have been coming to these events for years now. I think we met in 2007? 2004?
For those of you with poor comments, I challenge you to work with a nonprofit any nonprofit. It is hard work buy a few people who do it to further a cause they care about. We donate hundreds of hours a year. We aren't perfect but we love our mission and what we do. BTW I bought tickets as well and I would have done the same as Bill. I am also a paying member of the museum PWK started so many years ago.
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On 10/21/2024 at 6:23 AM, tube fanatic said:
Can you post the schematic?
Maynard
I don't know if my friend wants me to post it if he says yes I will post here.
The curves we saw for the 6J11 turned out a bit different from what we were seeing in the amplifier. It is still being dialed in but so far very stable.Compactrons are cheap and still plentiful.
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On 10/20/2024 at 4:28 PM, derrickdj1 said:
What exactly is a compactron amp compared to a regular SET amp? Is it the tubes, size, transformer, etc.?
Conpatron was the last in tube design. We just used all compactron tubes in this build. They were tv tubes sweep tubes. They are cheap and quite good.
Here is a good article on them..
https://www.junkbox.com/electronics/CompactronTubesIndex.shtml
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80% complete all compactron SET amplifier which should end up around 5-10 wpc. 6HJ5 wired as a triodepower tube, 6J11 driver, and two 6ax3 rectifiers. This thing is so heavy. This will have side rails and a front plate. The is the HF amplifier. The LF is yet to come but it will all be mounted in a 5ft ham radio cabinet. An ode to ham radio craftsman ship... Still a few small issues to iron out but fun build. Thanks to my friend Chris for all the deisgn work. I am but a solder monkey...
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On 10/8/2024 at 12:48 PM, babadono said:
@seti white noise? or pink? I would think white noise would lead one to attenuate the high frequency channel maybe more than it should be. I am no expert by any means but curious.
Sorry for the delay I use pink noise, then i use a sweep, and then I listen finish by ear.
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I use a an spl meter while I play white noise through the system and adjust the crossover gain controls till they are the same switching between amps. I have them marked with tape in case I move them.
Currently building amplifiers specifically for them the HF will be an all compactron SET amp 5-8wpc with a 6HJ5 not sure what will be LF.
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On 9/2/2024 at 8:34 PM, Travis In Austin said:
You have me stumped. @seti would know.
I was thinking horn loaded a$$? It was a marketing sales team shirt and I do not know the significance. That being said I could not help but put it on a shirt...
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On 8/20/2024 at 7:17 PM, babadono said:
@seti can you maybe help this Gent out?
Sorry I was MIA. I'm not sure I'd have gotten it right.
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Big speakers small room better than small speakers small room 8-) I love using big speakers as headphones. If the room is a compromise why compromise the speaker.
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As Tidal just dropped master tracks I am looking for something new.
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A friend bought one off ebay years ago for around $600 which he restored to like new condition. I saw another sell at an auction at Klipsch during a pilgrimage for about $300. A local Klipsch fan has a three-way system with two shorthorns and a model t in the middle. It sounds better than I thought possible. They are rare and important part of history and a cool addition to any collection. Do you have documentation that says they are a prototype? Would love to see the docs! These did see production for a short time?
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New out of the box. Updated. Reset. I have the app installed.
They charge unevenly.
One won't charge all the way.
When I use them both won't play reliably one keeps dropping. Haven't been able to listen longer than 5 minutes.
Any fixes?
Please advise!
**support replaced 8-) **
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It was a smaller group but very high quality. There are discussions ongoing for making changes for the next get-together.
A BIG THANK YOU to Ginny for stepping up and taking command of the visitor center and taking care of the day-to-day business. She is the local we desperately needed. The new gift shop is growing and getting many different products. Thank you Ginny!!!!!!!!!!!
Thank you Roy and Jim for the classes and tours.
The hardest working group we have is of course Craig and his crew. It is amazing to see the progress every time we go back.
For all the members thank you so much because without you the PWK Museum wouldn't exist and the events would never happen. If you aren't a member please consider it https://www.klipschmuseum.org/membership
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5 hours ago, CWelsh said:
It is the big can caps that really scare me. They are buried under a rat's nest of wires and have multiple wires connected to them. I recapped my Marantz 1060 and even replaced a few transistors, but everything is mounted on boards and is clean and easy. If it wasn't such a nice amp, I would try it. I just don't want to mess it up when I know someone with experience could restore it to better than new condition. I've even got all the new caps and am including them in the sale price.
If you get exact duplicate can caps made from HeySeed you just take really good pics so you get everything right and make sure you get everything on the right value. Don't do anything you aren't comfortable with but it isn't bad if you get the right parts and document properly.
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Caps don't look leaky. Maybe a nice cleanup and fresh wires for cosmetics if ya feel the need. If they work leave them. Mine were physically oozing or I wouldn't have touched them.
Inherited these and wondering which amp to try with the Klipschorns
in Technical/Restorations
Posted
Still be hard-pressed to beat a good 2A3 amp, especially with some fully horn-loaded Klipsch. Classic combo.