| What's going on in Pi world, eh? [message #39382] |
Sat, 07 December 2002 12:43  |
mikebake
Messages: 243
Registered: May 2009
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Grand Master |
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Who's got something cooking? Till, update The Great Flood, eh? I have yet to take delivery on the 2245H subs, Dale says he is thinking of delivering them tmrw. Good, the wife won't be home and I can sneak the monsters into the shop. They have wheels on them.
"oh, THOSE? I've had those a LONG time"
My buddies will be back for Xmas for a few days, so naturally I have to have them working by then.
MBB
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| Re: What's going on in Pi world, eh? [message #39385 is a reply to message #39383] |
Sat, 07 December 2002 20:19  |
replay
Messages: 284
Registered: May 2009
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Grand Master |
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hi wayne, the x-over is exciting. are you using a 24db/octave slope?. also will the x-over be adjustable? tubes sound cool. are you going to sell in kit or finished form? what's the anticipated retail. i don't mind being a guinea pig and testing your first sample. cheers, george
12awg concealed in garden hose and priced at $50 ft sounds best. really!!
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| Re: What's going on in Pi world, eh? [message #39386 is a reply to message #39385] |
Sat, 07 December 2002 20:42 |
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Wayne Parham
Messages: 18783
Registered: January 2001
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Illuminati (33rd Degree) |
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I've based my work on that of Steve Bench because he has extensive hands-on experience with tubes and tube designs. I am designing the filters that precede the 6DJ8 and that's really all there is to the circuit. It's two sections of a 6DJ8 tube, so two tubes are needed for stereo, and then the filter and that's basically it. There's a coupling cap on both sides, which is then really an additional VLF high-pass filter, and then there's the crossover filter and compensation circuit. It's so simple, it almost has the same low parts count of the passive crossover. The slope for each section can be made first, second or third order and the crossover point is selectable. But that's done by picking components, not by placing jumpers, or setting switches or potentiometers. One of the things that prompted the choice to use an existing design is that there is a circuit board already available which has plate-through holes for additional parts - Hopefully enough for the components needed for the π compensation circuit. I've discussed this matter with Steve, and he believes that this can be accomplished without "hacking" the circuit board. I've always hated etch cuts, jumpers and "floating" components, but it's attractive to be able to use an existing board as long as a lot of etch modifications aren't required. If extensive cuts are required and I then I may decide to have board etched instead. We'll see how much response there is.
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| Re: What's going on in Pi world, eh? [message #39388 is a reply to message #39386] |
Sun, 08 December 2002 06:53 |
billfort
Messages: 34
Registered: May 2009
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Baron |
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Hey Wayne - this is exciting stuff! This is exactly what I've been looking for for my Altec 604's. Tube crossover, 12db slopes, compensation for horn. I'm building another 300B SET amp to go with the one I already use, in anticipation of something like this. Can't wait! Keep up posted. Billf
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| Re: What's going on in Pi world, eh? [message #39391 is a reply to message #39386] |
Sun, 08 December 2002 12:40 |
DRC
Messages: 169
Registered: May 2009
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Master |
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Oh man! This is just what I'd want for the TAD/JBL/TAD monsters. Not in love with the DBX active I'm using, and would rather not do the passive with this in the wings . . . .. How long, oh how long . . . . I'll happily volunteer to be a guinea pig on this baby!
Keep your ears and your mind open.
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