speaker Driven Reverb

[jon]

Been thinking about a speaker driven reverb, like the old Hammond AO-44 and AO-35 set ups, or the Gibson GA1RT or the Ampeg ES-1. My real question is how do I set up the input off the speaker so I don't bow the reverb tank with high powered amps?

[passfan]

Here ya go Jon

http://www.webphix.com/schematic%20heav ... 10-121.pdf

[jon]

Do we know the tank number

[rdjones]

The Champ 12 used speaker signal drive for the reverb.

http://www.thevintagesound.com/ffg/sche ... _schem.gif

reddog

[rooster]

reddog, damn, I never realized this about the Champ 12. I have worked on a few of those amps over the years and never caught that. I did think the verb sounded lame but I never bothered with why. Ha! Now I know why, thank you.

Man, talk about a verb tail! It doesn't get much later than this! You made my day.

[rdjones]

reddog, damn, I never realized this about the Champ 12. I have worked on a few of those amps over the years and never caught that. I did think the verb sounded lame but I never bothered with why. Ha! Now I know why, thank you.

Man, talk about a verb tail! It doesn't get much later than this! You made my day.

If the reverb sounded lame you may not have been playing loud enough ;->

rd

[jon]

Ok so using the schematic from the AO-35 Hammond amp, I assembled the volume limiter. The tone of the reverb is nothing short of spectacular. I love the way my dry signal is not altered by having a device in front of my amp or in its loop.

Now, I think I want to build a dedicated combo amp for this.something that would be good stand-alone (sans reverb) or as the satellite.

I was originally thinking about a Gia with a special reverb input.

[Bob-I]

Ok so using the schematic from the AO-35 Hammond amp, I assembled the volume limiter. The tone of the reverb is nothing short of spectacular. I love the way my dry signal is not altered by having a device in front of my amp or in its loop.

Now, I think I want to build a dedicated combo amp for this.something that would be good stand-alone (sans reverb) or as the satellite.

I was originally thinking about a Gia with a special reverb input.

Oh yea, old Laurens hammond was an amazing engineer. I have a 1962 Hammond a-100, same organ as the B3 but with internal amps and speakers. The AO-35 reverb driven off the speaker sounds amazing, not to mention the organ tone. The only single part that's been replaced since this organ was born in 1962 is the reverb tank.

[jon]

You should hear the Vibrato unit I made using parts from a AO-41 organ amp.

[Bob-I]

You should hear the Vibrato unit I made using parts from a AO-41 organ amp.

Have you ever seen Hammond's vibrato unit? It's amazing and combines true vibrato with tremulant. It's based off a rotating capacitance bank.

I'm truly amazed at Hammond's engineering. Even Hammond SN 1 built in 1934 is still a working although it's sitting in the Smithsonian and no one plays it.

Vid of the scanner internals.

http://www.youtube.com/watch?v=DXYe3BcD4oI

Demo of the various tones. Note there's no adjust for speed because everything in the Hammond is based on 60Hz motors. It's still the only musical instrument that never needs tuning.

http://www.youtube.com/watch?v=JwavpcKS5O8

[jon]

You mean like this

[IMG:600:800]http://i82.photobucket.com/albums/j250/ ... G_1657.jpg[/img]

[IMG:800:600]http://i82.photobucket.com/albums/j250/ ... G_1658.jpg[/img]

[Structo]

You should hear the Vibrato unit I made using parts from a AO-41 organ amp.

Have you ever seen Hammond's vibrato unit? It's amazing and combines true vibrato with tremulant. It's based off a rotating capacitance bank.

I'm truly amazed at Hammond's engineering. Even Hammond SN 1 built in 1934 is still a working although it's sitting in the Smithsonian and no one plays it.

Vid of the scanner internals.

http://www.youtube.com/watch?v=DXYe3BcD4oI

Demo of the various tones. Note there's no adjust for speed because everything in the Hammond is based on 60Hz motors. It's still the only musical instrument that never needs tuning.

http://www.youtube.com/watch?v=JwavpcKS5O8

Man that is something!

I wonder if making an electro-mechanical Leslie type effect could be made like that?

I guess it does sound like a Leslie but the speed cannot be changed.

[Bob-I]

You mean like this

[IMG:600:800]http://i82.photobucket.com/albums/j250/ ... G_1657.jpg[/img]

[IMG:800:600]http://i82.photobucket.com/albums/j250/ ... G_1658.jpg[/img]

Not even close

I don't see any spinning scanner which is the key to the Hammond vibrato.

[Bob-I]

Man that is something!

I wonder if making an electro-mechanical Leslie type effect could be made like that?

I guess it does sound like a Leslie but the speed cannot be changed.

No, there's a pretty dramatic difference with some Leslie cabs. Leslie had many types of cabs, the ones we're used to hearing are the 122s and 147s which have the spinning horn. Leslie also made cabs with spinning oval speakers on drums, rotosonic, for more classical organ tones.

YouTube hammonds and Leslie's, really interesting technology. The Hammond additive synthesis is nothing short of amazing.

[jon]

Anyone Know what a #12 bulb is? I was using two #44's for the volume drop but I just blew them both when I dimed my Small Special 100.