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PWK Designed 1946 Push Pull 6A5G With Electronic Crossover


seti

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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-)

 

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Early in the testing process.

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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....

 

 

 

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

 

297557529_PWKPaperCrossover1.thumb.jpg.040e2a89807734017c7838327230eac8.jpg

1911045148_PWKPaperCrossover2.thumb.jpg.60471f5d4409bb625f5e01190c728da9.jpg

 

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.

https://images.squarespace-cdn.com/content/5f6b5b7d43287661f06340bd/1600895631848-ZPHWZF09F2Y8VEUCO3WW/image-asset.jpeg?format=1000w&content-type=image%2Fjpeg

 

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9 hours ago, seti said:

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

 

297557529_PWKPaperCrossover1.thumb.jpg.040e2a89807734017c7838327230eac8.jpg

1911045148_PWKPaperCrossover2.thumb.jpg.60471f5d4409bb625f5e01190c728da9.jpg

 

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.

https://images.squarespace-cdn.com/content/5f6b5b7d43287661f06340bd/1600895631848-ZPHWZF09F2Y8VEUCO3WW/image-asset.jpeg?format=1000w&content-type=image%2Fjpeg

 

I like this kind of stuff, thanks. 

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