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  1. J

    Simple Attenuators - Design And Testing

    Yep, screw on outside. My thought is if that box is a tight fit and screw heads are popping out it could present a challenge unless they were countersunk. They also look better IMHO.
  2. J

    Simple Attenuators - Design And Testing

    Mounting on the side would free up a lot of room but with the side vents it may only be possible to fit one or two. I recommend countersunk screws! If it were my build I would put all the HOT resistors (R1's) directly in the path of the fan and spread out the other stages between the switches...
  3. J

    Simple Attenuators - Design And Testing

    I love that box. I was thinking of putting the Lotus in that but the added machine work was a lot.
  4. J

    Simple Attenuators - Design And Testing

    That's exactly the idea.Still working on final design but the idea is to get the plan plenty of smooth power without overpowering it.
  5. J

    Simple Attenuators - Design And Testing

    0.47 on the coil is fine! I am guessing it's a 2x12 DeVille? I would recommend a fan and beefing up the reactive stage to 100w spec. @JohnH and I have been discussing and revising the fan circuit from half wave to full wave rectifier with a huge reservoir on the filter cap. The schematic below...
  6. J

    Simple Attenuators - Design And Testing

    She plays a Firebird V!, obviously you are a great dad.
  7. J

    Simple Attenuators - Design And Testing

  8. J

    Simple Attenuators - Design And Testing

  9. J

    Simple Attenuators - Design And Testing

    Update: JohnH has Lotus M2 #1 and I think he likes it. We have been working on the M4 version of the Lotus and wanted feedback/comments on the planned design before I start the layout for the PCB. Many thanks to @JohnH for his help on this schematic. Features: - 120w version in 4Ω, 8Ω, and...
  10. J

    Tone King Ironman II or Fryette PS-2

    We used to be neighbors!! the M4 will be bigger than the M2, 160x160x53mm vs 160x120x53mm, but still a lot smaller than everything else that can handle that much power.
  11. J

    Tone King Ironman II or Fryette PS-2

    I'm nearly finished with the design for a 120w M4 that will include the initial 3.5db stage, transformer balanced/unbalanced out and optional footswitch for 3.5db boost/cut. There will be a 16Ω, 8Ω, and 4Ω, model.
  12. J

    Simple Attenuators - Design And Testing

    So this gives me some thoughts. The Lotus is 60w, I thought about doing a 30w version but didn't make sense economically as it would retail for about $30 less than the 60w. Lotus is still less expensive than the Ironman II 30W and sounds better IMHO. The 120w version will have the initial...
  13. J

    Simple Attenuators - Design And Testing

    It may be all good depending on how hard you push the amp but a 16ga coil is a lot less expensive than a new OT, set of power tubes and service/time to replace the screen resistors and grid stoppers.
  14. J

    Simple Attenuators - Design And Testing

    That would fall under custom built by Gene category, even if I was willing my design doesn't make it feasible on a PCB. It's a hard no from me. That being said the 120w M4 will have a min attenuation of -3.5db (Halves the first stage) and the -3.5db step downline could be foot-switchable as a...
  15. J

    Simple Attenuators - Design And Testing

    Not gonna happen. Switching to bypass while the amp is running is kind of like putting your car in reverse on the freeway. @Gene Ballzz will make a PTP with bypass but he recommends against it as well for the above mentioned reason.
  16. J

    Simple Attenuators - Design And Testing

    DM'd
  17. J

    Simple Attenuators - Design And Testing

    M4 version is in design, it will be 120w in 16Ω, 8Ω, and 4Ω versions. It will have the initial -3.5db, balanced/unbalanced line out. Bass resonance, etc. It will be in a larger enclosure as well and most likely have two fans. There is a lot that could be added such as IR loader, etc but then it...
  18. J

    Simple Attenuators - Design And Testing

    #1 is on its way to JohnH, here is a video from @MasterEvan07 of an 8Ω into a Princeton AA1164 circuit at -21db.
  19. J

    Simple Attenuators - Design And Testing

    Lot's of ways to run 2 fans, separate diode/cap/resistor, series, parallel, etc. I decided to keep my design as simple as possible with one fan.
  20. J

    Simple Attenuators - Design And Testing

    The model of the fan doesn't matter much, just get a DC brushless fan, currently I am using 40mmx10mm 12v DC brushless fan from Amazon, prices vary between$5-$10. If you get a 3 wire fan don't use the yellow lead.

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