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Posts posted by seti

  1. This is the article that started it all. Thanks to Jim Hunter.





    Then there was this PWK schematic that was related to the article. It isn't secret it iwas wall art at Klipsch in Hope. We were the first to build it 8-) since PWK in 1946. My friend Chris made some minor changes here and there. PWK's electronic crossover and this schematic is what we did. You could do similar with traditional outputs. Ain't nuthin stopping ya 8-) It could easily be a 2A3 version..Since there was no power supply we went overboard.


    This was on the wall at the museum... Been looking at it for years.



    • Like 3
  2. On 1/20/2023 at 2:37 PM, henry4841 said:

    Now that is an old one for sure. I have 6 or so old scopes but none that old. My repairs of old scopes has been hit or miss. Most times it is a power supply problem though. 


    But getting back to reforming old caps, unless the equipment is decades old I do not go through the trouble myself. Does not hurt to be too careful though. To answer the how question, slowly bring the power up to approximately 60V's and hold it awhile there then slowly bring it up to line voltage from there. 


    I have a stack of 40's HP gear IT IS HUGE!


    I bring them up very slowly but yeah the culpret is usually a cap somewhere. Never leave tantalum caps always replace..


    I think I replaced 1000 caps in a stack of Sound Technology test gear but hey it all works now.





    • Like 1
  3. Here is what I used to setup as curve tracer. Being able to step through caps and parts while in circuit is invaluable tool.


    Here is a terrible pic of mine.



    It is also fun to restore scopes of course it helps to have one as a curve tracer to start with....


    Check your craigslist I bet there are a handful to choose from.


    • Thanks 1
  4. 9 minutes ago, tigerwoodKhorns said:


    Yea, I am updating my electronic tools lately as I have several amps that are due for caps and refresh and I need to brush up on my skills with these. 


    So any scope? 





    Yeah there are some cool ones out there I have HP, Tektronix, and a sencore. The sencore is cool because it can measure voltage at the same time but  you wouldn't want to tie up that scope for one purpose. I really like the tektronix scopes. There are lots of them and they are affordable.


    I am rebuilding my workbench from scratch which should be fun.... lol scary.....

    • Like 2
  5. On 1/20/2023 at 10:32 AM, babadono said:

    So I think JWC built the snails before my tenure here...but basically they are a non bifurcated Jub. bass bin?


    There are cool build threads somewhere on this forum.


    Snailhorn curve I found  inside corner-3feet-micoffgroundon onaxis-K31-smoothed.

    Also a mid construction pic.






    • Like 2
  6. This is a tough one to post. 


    I need some space and some funds for a project.  JC built all these and they are all amazing I have tons of hours on these and have had them for many years in multiple configurations. I don't want to part with them but they need to sing and I need a little cash.


    Pair Tractrix horns 60hz-600hz straight. Black needs a fresh coat of paint and some clean up. There is a crushed corner on the dog house but it came like that I never fixed it. These come with four Eminence Delta Pro-12A 12" Cast Frame drivers. These horns sound amazing.....


    Pair Snail Horns you can load these with anything from 12" to 18" woofers. These come with four Klipsch K31 drivers. Pretty  low up to about 300-350hz


    Pair of mid Tractrix Horns no drivers and need to do your own mounting plate. I have 4 different mounting adapters you can have two jbl and two not sure but could be helpful.


    I have a pair of round tractrix tweeters but they are offered to a local diyer for free. If he turns them down I'll offer them for free as well.


    6 horns

    8 drivers


    $1000 for all of it and


    They are dusty and need cleaning up I just didn't have time.


    Pickup only Little Rock










    • Like 8
  7. 1 hour ago, henry4841 said:

    Really nice and cool looking. I would be proud as I am sure you are. Five watts are all that is needed with our speakers. 


    This amplifier will only work on the #1 Klipschorn in the museum WE555 on the HF and the first khorn sported a Jensen A12PM in the LF. PWK designed the electronic crossover for this speaker specifically....




    • Like 3
  8. Finally 99.6% completed. There are only two things I would change so not too bad. This was a hard learning experience and I will never build exactly like this again 8-) Here is the recap. Built this mono tube amplifier for the Klipsch Museum with the much help from Chris Hornbeck and Intact Audio. It was a found schematic from the Klipsch archives for the #1 Klipschorn from 1945/46. It is a push pull triode 5 watt amp with built in electronic crossover. It is made specifically for the first klipschorn. The first khorn bass horn featured a Jensen A12PM and the HF a prototype horn with a Western Electric 555… Amazing. This is a gift it to the #1 Khorn and Klipsch Museum for PWK's birthday in  March so maybe next years birthday we will be able to listen to the #1 khorn as they did at a party to celebrate the end of WW2. Not sure how long this build took but it was worth it. BTW it is a 5wpc and it does go to 11 as did the orginal in 1945/46… 


    Dave Slagle of Intact Audio studied PWK's electronic crossover design and donated all the transformers. The top plate and front plate are from Front Panel Express. Jim Hunter found the an early PWK signature and Matt Sommers made that into a logo.


    We still have some final adjustments and some testing to do but it is largely done. I love the old HAM chassis and buy them as I see them. A great way to wrap up a project.


    It is DIY so it ain't perfect. Hope @Chief bonehead approves 8-)













    Early in the testing process.







    • Like 10
    • Thanks 6
  9. 22 hours ago, OO1 said:

    a few of us have a picture of the lamp  , but being it's PWK's house ,  we should respect the Privacy of Paul and Valerie Klipsch , in their Absence 



    Valerie invited us all into her home to take pictures with us and talk PWK several times. Celebrating anything PWK related made her happy. Of the things that would have annoyed her pictures were not on the list. Ask Colter 8-)





    • Like 1
    • Thanks 1
  10. 23 hours ago, henry4841 said:

    It appears the Chinese do not have the ability, at least Psvane, to produce really low noise, matched internally for dual triodes, tubes consistently as the giants in tube manufacturing era did years ago. 




    I have a hunch most modern tubes especially rectifiers can't hold a candle to originals.



    • Like 3
  11. 4 minutes ago, mike stehr said:



    It's the static display version.

    A guy ditched on me at an audio meet and greet.


    It used a couple of filament transformers to light up the heaters to the tubes for display.

    Then it had a plastic hammond case inside mounted on the front, with a Velleman LED control PCB inside, and a couple 9-volt batteries. (with 2004 date codes)


    There was a little switch on the back for the LED display.

    The knobs on the front are fake...like cabinet knobs screwed in with Allen bolts.

    The switches are real, but not connected to anything.


    If anything, I scored two dozen fresh input jacks, and ten good tube sockets.

    The wood chassis is actually solid Bubinga. 

    I'm pondering the idea of using the aluminum chassis plate and Bubinga base for an amplifier project.

    But maybe shorten the plate and base for a smaller profile.


    Interesting piece for the Poverty Audio scrapyard...



    That is funny. There was an article years ago with the Foxgate tube surround sound he built for his own use. It looked pretty close to that.



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