6DJ8 Tube Crossover [message #39688] |
Thu, 02 January 2003 02:51 |
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Wayne Parham
Messages: 18787 Registered: January 2001
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Illuminati (33rd Degree) |
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I've put the Spice model online for the π implementation of the 6DJ8 tube crossover. You'll need OrCad's version "PSpice" to run this model, and you'll need to install the libraries contained in the distribution file. It's a pretty big distribution, to tell the truth, but it has the advantage of allowing you to work directly with the schematic. OrCad was originally written for PCB layout, so you can layout a circuit board and have fiberglass made with it too.
First, download "PSpice" and install it, and then download the 6DJ8 crossover model. Inside the crossover distribution file, you'll find another archive called "Tubemods.zip" which must be installed and configured before the model will work.
Active implementation of π compensated crossover using 6DJ8 tube
First, second and third order networks can be formed by configuring the circuit to use one, two or three poles. Components R15/R16 and C10 are similar to R1/R2 and C1 on the π passive crossover networks. This is the HF compensation section of the circuit, and values may be modified for different amounts of compensation. You'll also notice the addition of resistor R17 in the LF circuit, which damps the filter and improves response. All other component designations follow those used by Steve Bench in his crossover circuit.
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Re: 6DJ8 Tube Crossover [message #39689 is a reply to message #39688] |
Thu, 02 January 2003 03:11 |
spkrman57
Messages: 522 Registered: May 2009
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Illuminati (1st Degree) |
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Wayne, Would like to see if anyone out there will provide kit form or finished built product for those of us who don't have the time to build. Sounds like a good thing though. Keep us informed. Regards, Ron
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Wayne.... [message #39697 is a reply to message #39696] |
Thu, 02 January 2003 12:27 |
Garland
Messages: 269 Registered: May 2009
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Grand Master |
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At some time would you be able to specify the components on Gary Kaufman's boards for use with My Theater 4's. I'm fair at soldering but no good at working with computers, downloads, etc. Dave Cope and I are ordering a batch of boards from Gary and hope to have something working in the not too distant future. (That is, "with a little help from our friends") G.
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Re: Four π implementation [message #39794 is a reply to message #39703] |
Wed, 08 January 2003 16:30 |
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Wayne Parham
Messages: 18787 Registered: January 2001
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Illuminati (33rd Degree) |
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Here are lists of component values: For an Altec 811 or other horn with collapsing directivity: R1 - 1M R2 - 1M R3 - 1M R4 - 91K R5 - 100K R6 - 100K R7 - 22K R8 - 1M R9 - 89K R10 - 18K R11 - 1.3M R12 - 1.3M R13 - 22K R14 - 1M R15 - 3.3M R16 - 3.3M R17 - 220K C1 - 0.22uF C2 - 2200pF C3 - 0.01uF C4 - 270pF C5 - 0.22uF C6 - 2200pF C7 - 2200pF C8 - 2200pF C9 - 0.22uF C10 - 15pF For a Peavey CH-3, Eminence H290 or Martinelli horn: R1 - 1M R2 - 1M R3 - 1M R4 - 75K R5 - 83K R6 - 83K R7 - 22K R8 - 1M R9 - 150K R10 - 33K R11 - 2.2M R12 - 2.2M R13 - 22K R14 - 1M R15 - 3.3M R16 - 3.3M R17 - 220K C1 - 0.22uF C2 - 1600pF C3 - 6800pF C4 - 200pF C5 - 0.22uF C6 - 1000pF C7 - 1000pF C8 - 1000pF C9 - 0.22uF C10 - 10pF The response curves look good so give those values a try and let us know how it sounds.
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