Joe,
Absolutely not a problem. You can use a tube in follower configuration and build a Sallen-Key filter around it (the cathode is the + input). More elaborate topologies are possible, too, if you want to make a really fierce-looking circuit.
Try www.tubecad.com for some nifty tube crossovers or roll your own. The stuff in the Xenover thread can be adapted, although it might be easier to visualize with the stuff I put in the earlier crossover thread a year or two ago, as I was using followers to illustrate the S-K hookup.
Grey
Absolutely not a problem. You can use a tube in follower configuration and build a Sallen-Key filter around it (the cathode is the + input). More elaborate topologies are possible, too, if you want to make a really fierce-looking circuit.
Try www.tubecad.com for some nifty tube crossovers or roll your own. The stuff in the Xenover thread can be adapted, although it might be easier to visualize with the stuff I put in the earlier crossover thread a year or two ago, as I was using followers to illustrate the S-K hookup.
Grey
burnedfingers said:Brett
I have had a 24db per octave low pass electronic crossover in place for the last 15 or so years. Since I'm into tubes now it seems like Blasphemy to even consider using it now.
So, I'm hardly Mr Sandamp, and I use them there. It still works really well. Just don't run the high pass signal through it.
Sand has it's places, and <100Hz is one of them.
Quote:
So, I'm hardly Mr Sandamp, and I use them there. It still works really well. Just don't run the high pass signal through it.
Sand has it's places, and <100Hz is one of them.
Thank you Brett for your opinion, however as I stated I already have a custom built crossover made with "sand components". To be exact it is a mono summing circuit followed by a 6th order 24db per octave high pass filter at 27hz followed by a 24db per octave low pass filter set at 80hz.
If I had wanted to continue using this I would. As stated in a prior post it is my intention to build a filter using a tube based design, Why? Because I want to.
Joe
So, I'm hardly Mr Sandamp, and I use them there. It still works really well. Just don't run the high pass signal through it.
Sand has it's places, and <100Hz is one of them.
Thank you Brett for your opinion, however as I stated I already have a custom built crossover made with "sand components". To be exact it is a mono summing circuit followed by a 6th order 24db per octave high pass filter at 27hz followed by a 24db per octave low pass filter set at 80hz.
If I had wanted to continue using this I would. As stated in a prior post it is my intention to build a filter using a tube based design, Why? Because I want to.
Joe
Hi,
Hopefully this may help you, Joe:
http://www.marchandelec.com/xm26.htm
http://www.bonavolta.ch/hobby/en/audio/filter.htm
http://www.enjoythemusic.com/tubecros.htm
http://members.aol.com/sbench101/#Electronic
Cheers,
Hopefully this may help you, Joe:
http://www.marchandelec.com/xm26.htm
http://www.bonavolta.ch/hobby/en/audio/filter.htm
http://www.enjoythemusic.com/tubecros.htm
http://members.aol.com/sbench101/#Electronic
Cheers,
A few more tube XOs
http://www.t-linespeakers.org/tubes/xos.html
some of them are redrawn from the Enjoy the Music link.
dave
http://www.t-linespeakers.org/tubes/xos.html
some of them are redrawn from the Enjoy the Music link.
dave
Hi Joe
I´m a new member to this forum since 10 minutes! I just wish to say that i´m using a tube crossover for sub and it sounds lovely. It is US made but i cant tell the name of it since i am at work. It is old though guess made in the 60s. It has variable crossover from 0,01Hz to 2kHz by combine a couple of switches and two pot´s, one for low cut freq. and one for high cut freq.
Best regards
Kalle
I´m a new member to this forum since 10 minutes! I just wish to say that i´m using a tube crossover for sub and it sounds lovely. It is US made but i cant tell the name of it since i am at work. It is old though guess made in the 60s. It has variable crossover from 0,01Hz to 2kHz by combine a couple of switches and two pot´s, one for low cut freq. and one for high cut freq.
Best regards
Kalle
Hi,
Not that wise but enjoying helping out the "jonkies" nonetheless...
Now, promise me that you have learned Ohm's law by heart...
Just kidding, Joe.
And welcome to Kalle of course!!
Take care,
There are a number of very wise ones here that enjoy helping and guiding.
Not that wise but enjoying helping out the "jonkies" nonetheless...
Now, promise me that you have learned Ohm's law by heart...
Just kidding, Joe.
And welcome to Kalle of course!!
Take care,
Hi again
A little late answer it is but i have been out of order, so to say (catch a cold).
Joe, i am sorry i don´t have any drawings on the filter. I wish i had. But it is a Krohn-Hite model 330-A "Ultra-Low Frequency Band-Pass Filter" made in Cambridge Mass. If that is to any help.
Regards
Kalle
A little late answer it is but i have been out of order, so to say (catch a cold).
Joe, i am sorry i don´t have any drawings on the filter. I wish i had. But it is a Krohn-Hite model 330-A "Ultra-Low Frequency Band-Pass Filter" made in Cambridge Mass. If that is to any help.
Regards
Kalle
burnedfingers said:I should be able to track the schematic down now.
If you scare one up let us see... be interesting to see if they do anything special. Their amps have quite a rep.
dave
fdegrove said:BTW, did the Krohn-Hite use tubes?
Yes. They were noted for their incredibly low measured distortion. I have chatted with a fellow in New Zealand who uses them with a set of IMF monitor clones and he loves them, and with another fellow in Calgary who builds & repairs amps -- he verifies their measured performance & says they are one of te worst sounding tube amps he has come across.
These amps were designed to be measurement amps in test kit.
dave
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