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justinsweber

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Posts posted by justinsweber


  1. SunValley SV-Pre1616D Tube Preamp Line Stage. 

     

    Condition is New; built but never used. Was enchanted by the idea the Marantz 7 circuit done right. 

    Kit was $700 without upgrades. 

    Fantastic kit, Swapped the stock pot for an Alps Blue Velvet, all wiring was done with Silver plated copper with teflon. 

    Solder is Cardis silver. 

    Based on Marantz 7 circuit.

    Can be used with 3 AXU7s or any combination of 12AX7 or AU7 tubes. Tube rectifier, GZ34/5AR4.

    Comes with full tube set, Pre tubes are NOS, rectifier is new. 

    Its a really fantastic pre. I rub all XLR and as such it hangs out in my cabinet unused. 

    https://wallofsound.ca/misc/diy/coming-soon-sun-valley-sv-pre1616d-tube-preamp-kit/

     

    Shipped with FedEx Ground or FedEx Home Delivery.

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  2. If I can make 2 suggestions. 

    ALK ES and AP12 networks expect to see a predicted inductance of the voice coil. Meaning that it’s set for a K33/K43 woofer.  The Kappa 15C has been measured by Al and is also compatible.  If you use something different the crossover could not be expected to perform as predicted.  Maybe it wouldn’t matter. Al and only a handful of other people can do the level of calculations needed.  In short, use a k33 or kappa 15C or ask Al. 
     

    Secondly, the DE85 is lovely, is perfect especially for this application. That said. The DE750 was a monster. Bass was much improved.  It’s the same diaphragm but 2x the magnet.  

    • Like 1

  3. 5 hours ago, DizRotus said:

    They look good Justin.  Would you consider editing your subject line?  At first I thought this was a relationship thread about achieving “her” nirvana.

     

    Also, it took me a bit to realize you weren’t referring to speakers built by POTUS’s former attorney.

     

     

    How is the treble as you move about?  Are they at all beamy?  It’s been my experience that large surface area sources (can you say Magnepan?) tend to beam the highs.

     

    In any case, your workmanship is again excellent and, if you say they compare favorably to your Cornscalas, I’m impressed.

    They really sound fantastic.  Less bass then the cornscala imaging and tonal balance is incredible. Think Dynaco A25/Devore O93. At this point Id say the cornscalaa and the AN15 are my 2best speakers.  Big but not huge and incredibly impressive. 

    • Thanks 1

  4. 5 hours ago, DizRotus said:

    They look good Justin.  Would you consider editing your subject line?  At first I thought this was a relationship thread about achieving “her” nirvana.

     

    Also, it took me a bit to realize you weren’t referring to speakers built by POTUS’s former attorney.

     

     

    How is the treble as you move about?  Are they at all beamy?  It’s been my experience that large surface area sources (can you say Magnepan?) tend to beam the highs.

     

    In any case, your workmanship is again excellent and, if you say they compare favorably to your Cornscalas, I’m impressed.

    All fixed.  First time using phone to post.  


  5. Yes it was worth it.  Special thanks to Dave Harris for the design and baffles.  
    My cornscala is a truer to source output but these sound like music. I would easily place them on par with my cornscalas.  
    Though I built both and didn’t skimp at all. I would say the cornscala is still more stoutly  made. If You ever get a chance to hear the 15 take it upon yourself. I’ve had the 8 inch and heard the 10, but neither compare to the scale and detail and ease the 15 provides.  

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    • Like 2

  6. I’m not the same Justin. 
    That said, been building SET amps and modifying Klipisch speakers for 20 years.  Given that I’m 40, means I’ve been at it for a tinny but of time ;-). On all the forums I’ve always used my full name or company name. I don’t like aviators which sometimes hide identity.
     

    If you guys want some more shots of the Cit V let me know. It’s interesting. I’m getting 32watts rms with the 7581a and tube rectification but it’s very very wide bandwidth. I think the bandwidth makes amp sound much more powerful.  

    • Like 1

  7. The magic of the HK designs are that the transformers are relatively common.

    HK, complicated circuits... basic iron... UL for Cit II and Non UL for Cit 5.

    Macintosh... simple circuits, complex transformers. 

    Its very difficult to duplicate Mac Iron... HK outputs can me made for any number of great suppliers. 


  8. 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... 

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  9. If I may provide some thoughts.  
    The 510 is awesome you may need to remove all dampening, 2ndly. Bob has sold a cs500 that had HF ep for 2way setups. I had a  m2380 and hf200 with his crossover.  May just need to ask about it. 
     

    with that said, the 510 makes much much much more sense in 3 way. If you had a K77 or any horn loaded/compression driver tweeter and a ALK cornscalawal. You get the Large mid range sound stage and be able to adjust the presence of the tweeter.  You’ll be able to adjust the crossover to your preferences.  
    You can get a good copression driver for $25-$50 each and there are a wide range of horns. Happy to show you ones that you can make fit. 
     

    So... If want 2way, ask bob for crossover with eq. 
    if want 3 way. Get tweeter and cornscalawal crossover. 
     

    Lastly, feel free to call

    me and talk it over further. 
    949-636-9076 PST

    • Like 1

  10. 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

  11. 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.  

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