Viitalahde
Well-known member
I'm thinking of getting some EF86's and prototyping the bandpass filter from this schematic: http://www.cgs.synth.net/tube/vcf.html
The sound samples at the Metasonix site are cool and the description suggests the commercial circuits are related to this one.
Now, this circuit has been discussed previously. The moment I saw it, I knew I'd like to test it in a configuration similar to the Sontec EQ circuit: http://img.photobucket.com/albums/v240/virtalahde/MEP250a_schemo.jpg
The bandpass filter gets either straight or inverted signal depending on the EQ gain pot, thus boosting or cutting when summed back in the amplifier.
What do you tube gurus think that would be a worthy thing to experiment as the main amplifier? A tube op-amp is an obvious choice, but I'm kinda concerned of the possible gain/bandwidth limitations..? Maybe it's not an issue if/when I'm not aiming for 12dB @ 20k but..
Anything else coming to your minds? If I ever went and actually built a full-blown EQ around this one, I wouldn't see sense in more than 2 or 3 paralleled bands like this.
The sound samples at the Metasonix site are cool and the description suggests the commercial circuits are related to this one.
Now, this circuit has been discussed previously. The moment I saw it, I knew I'd like to test it in a configuration similar to the Sontec EQ circuit: http://img.photobucket.com/albums/v240/virtalahde/MEP250a_schemo.jpg
The bandpass filter gets either straight or inverted signal depending on the EQ gain pot, thus boosting or cutting when summed back in the amplifier.
What do you tube gurus think that would be a worthy thing to experiment as the main amplifier? A tube op-amp is an obvious choice, but I'm kinda concerned of the possible gain/bandwidth limitations..? Maybe it's not an issue if/when I'm not aiming for 12dB @ 20k but..
Anything else coming to your minds? If I ever went and actually built a full-blown EQ around this one, I wouldn't see sense in more than 2 or 3 paralleled bands like this.