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previous: jeff does anyone have any schemas' etc .... -- 1/19/2000 3:18 AM

Re: Fender NORMAL as distortion "pedal" ?

1/19/2000 10:58 PM
Scott Swartz	Re: Fender NORMAL as distortion "pedal" ? The basic concept of the Boogie Mark I was an additional gain stage in front of the normal Fender blackface circuit, similar to what Doc describes above - cascaded preamp gain stages with careful component selection to provide good voicing. Just using the two stages probably isn't enough; You need to have at least three stages and a master volume, maybe a way to switch it in and out, etc. In Dan Torres book he shows a circuit for an extra gain stage that is selected by which input jack you plug into. You probably need a master volume to go along with the extra gain stage. Here's an option to think about. In between the first triode of the "Vibrato" preamp and the tone controls have a switch - one position as normal, the other routes the signal to the wasted tube. The wasted tube can be voiced for overdrive and the "Normal" channel tone controls can also be optimized for overdrive. There would be no reverb on the distortion channel. The switch could be a relay or done with LDRs. How far are you willing to mod the amp? This is a lot of work and ruins the resale value.

1/19/2000 10:58 PM

Scott Swartz

Re: Fender NORMAL as distortion "pedal" ?

The basic concept of the Boogie Mark I was an additional gain stage in front of the normal Fender blackface circuit, similar to what Doc describes above - cascaded preamp gain stages with careful component selection to provide good voicing. Just using the two stages probably isn't enough; You need to have at least three stages and a master volume, maybe a way to switch it in and out, etc.

In Dan Torres book he shows a circuit for an extra gain stage that is selected by which input jack you plug into. You probably need a master volume to go along with the extra gain stage.

Here's an option to think about. In between the first triode of the "Vibrato" preamp and the tone controls have a switch - one position as normal, the other routes the signal to the wasted tube. The wasted tube can be voiced for overdrive and the "Normal" channel tone controls can also be optimized for overdrive. There would be no reverb on the distortion channel. The switch could be a relay or done with LDRs.

How far are you willing to mod the amp? This is a lot of work and ruins the resale value.

Replies:

jeff thanks Scott,this amp will ... -- 1/22/2000 6:32 AM