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Tube active low pass crossover
Tube active low pass crossover
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Old 31st October 2006, 08:30 PM   #1
Diy martin is offline Diy martin  Netherlands
diyAudio Member
Join Date: Apr 2003
Location: papendrecht
Question Tube active low pass crossover

Hello Diy members,

I am looking for a schematic of a tube active crossover .
I am only going to use the Low pass output ,crossover frec. is 160Hz
Steve Bench has a nice design based on the 6dj8-ecc88
has anyone any experience with this design? Or has anyone built something similar?

All info is welcome.
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Old 2nd November 2006, 11:09 AM   #2
Peter M. is offline Peter M.  Norway
diyAudio Member
Join Date: Jan 2005
Location: Østfold
Some interesting links


Note to myself: Never again use fingers to check if there still is voltage left in a capacitor...
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Old 2nd November 2006, 05:48 PM   #3
Diogenes is offline Diogenes  United States
diyAudio Member
Join Date: Jun 2004
Location: WA
I found the following schematic for a 50Hz lowpass tubed crossover (12dB/oct slope) somewhere on the internet a while back. I'm not certain, but I believe the frequency can be changed via the component values by back calculating using the formulae here.

Click the image to open in full size.

I've dug around the Marchand site some and looked at their manuals. From what I've seen, their tubed crossovers appear to be basically two of the same circuit chained together to create the 24dB LR slope.

- JP
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