Jump to content

justinsweber

Regulars
 View Profile  See their activity

  • Posts

    1707

  • Joined

  • Last visited

 Content Type 

Posts posted by justinsweber

    Harman Kardon Citation II Tube Amy with Heritage

    in Talkin' Tubes

    Posted

    So Ive been working on a project for a hair over a year... Its kinda my moonshot. Its a Cit V Mono. It was an effort to make the Cit monos repeatable. My Cit IIs are incredible but the metal work is far too time consuming... to make it work the metal work had to be CNCd. 

    The hardest part of the project was the metal work. We worked on paper first, then an Al chassis... which we have spare and then linked up with a sheet metal fab shop.

    12Gage SS is a total pain to work with but the end results are incredible. 12gage, with 2 12gage mid braces, all seems are welded and ground flush... surfaces are jitterbugged. All labels are laser etched. The Chassis with its bottom plate and 2 mid braces was ~ 30lbs before any parts were installed. 

    Rather than rehabbing a Cit V, I wanted to build anew... new connectors, new turret boards and enough room to make serving for the next 50 years a breeze. 

    We like went a bit over spec on the transformers... 200% or so on the power... 8A on the filaments... think I can lightup anything and tube Rect. 

    Our measured performance was 4hz to 110khz -3db @ 1watt and 10hz to 100khz -3db @ 10watts. 32watts RMS... Not the power monster my Cit II is with KT120s but digs sooo deep with a flat fr. 

    Here are some of the pics... 

    IMG_0114.jpg

    IMG_0095.jpg

    IMG_3369.jpg

    IMG_0100.jpg

    Recently Acquired La Scalas and Upgrade Progress

    in 2-Channel Home Audio

    Posted

    If you’re still in the mood for upgrades.

    A doghouse brace with further the articulation, all around wonderful upgrade.   You can get the braces which need to be hand gotten from Greg at Volti or Dave Harris.  
    the other upgrade would be a fastrac kassala horn from ALK/Dave Harris.  Will fit existing opening if I recall? Increase size of sound stage.  Less congested mid range.  
     

    lovely room  and speakers. 

    • Like 2

    Cornscala with Fatial Horns

    in Technical/Restorations

    Posted

    Dave H did something super cool. He took a lth142 and was able to have a machine shop bore out the throat to take a 2”.  I think it was modifying the mounting ring. I think he then paired a DE85 and was very very pleased with the results.  
    ALK designed the CSW450 for me.  It’s like a AP12 450 and the cornscalawal up top.  I’ll shot a pic of it this afternoon.  
    The HF140 was the best 1.4” I could think of. 2” are so much easier to find drivers for. 
    The STH100 is super impressive. I’ve had good luck with the de10. I had wanted the parts express de250 clone with polymide but they have DC’d it and only have the titanium. 
    The DE10 crossed at 5600 on up should work nicely.  

    2nd Dayton MKBoom Build Thread

    in Technical/Restorations

    Posted

    Here are my build pics.

    Re amp board to crossovers. I desoldered the connectors off the crossover and soldered 2 of the black wires +/_ directly to the crossover PCB inlace of the red/black.

    Ive read you can add a 2nd battery, PE wasn't clear on how this is done and Ive read that you can kill the board hooking it up incorrectly.

     

     

     

    IMG_2341.jpeg

    IMG_7192.jpeg

    IMG_7707.jpeg

    IMG_8273.jpeg

    • Thanks 1

    2nd Dayton MKBoom Build Thread

    in Technical/Restorations

    Posted

    The amp/controller board was a total pain.  If they combined all the documentation in one place it would be amazing.  I like a dumass built the cab before installing the crossover. As a result. I’ll drill hole for the crossover and use nut/bolt combo. 

    Things I’d like to improve.... documentation. If it was better it would become their best seller. 

    2, it should be easier to add a 2nd batter back. There is some confusion on the site about how to make it happen... extending usable time with more batteries... esp as there appears to have room would be great.  Lastly. There is a 50watt version of the amp. Might be fun to swap in.  

    If someone takes their time (1hr to read everything and line it up) it’s pretty straightforward. Parts express could help with better/more videos of this.  Your pics are super helpful.  I just built the boards out and your pics helped me realize I forgot to install crossovers first.  

    • Thanks 1

    Cornwall, Cornscala, other? audition request

    in 2-Channel Home Audio

    Posted

    More relaxed too end.  Only one crossover point.  Easier to make sound as one unified source. 

    Bobs designs are very very well thought out.  The 1.5 is similar in size and it’s ported design to the Klipsch tangent Speakers which were well regarded. The 2 way design of it gets rid of the k700 and k77 for a modern tratrix horn.  The down size of that specific horn is that it needs to be crossed higher that the k700 or than the larger horn her uses in the cornscala d. 

     

    My smaller cornscalas are 20x30x18 and are very similar in thinking to his cornscala d.  

     

    i recently did a diy 2way heresy.  Sealed cab heresy with cornscala type d  top end. It’s as wonderful speaker but costs about what the cornscala did. Smaller size, same price, similar performance... not as deep or large as the type d.  

    • Like 1

    Cornwall, Cornscala, other? audition request

    in 2-Channel Home Audio

    Posted

    Give. The size of the living room. You might consider  bob frites CS-1.5T. It’s uses a 12” woofer like the Heresy. It’s ported... digging lower than a heresy and closer to a cornscala. The mid horn is fantastic with lots of driver choices. 

    My own diy heresy design is similar but I used a larger mid horn.  

    Lots of choices... size of speaker really determines what’s the best choice.  

×
×
  • Create New...