Not your average spring reverb

[Blue Jinn]

Check this out:

Hammond DR-20 Reverb Tank | eBay

I found an article for a DIY reverb in an 1950 something Popular Electronics. The project is vague on the electronics, referencing a "driver coil" with no other description. I guess this is kinda what they had in mind....

 

[jamievespa]

As far as I remember the reverb tank in a Hammond tone cab is usually bathed in oil as to provide damping for the springs, still pretty impressive

 

[mdainsd]

The early Hammond tanks were oil damped.p you could tune there performance with oil level and viscosity. Later they moved to a dry system. Both have been robbed for other (non organ) uses.

 

[mixsit]

Wow cool stuff-- oil and all
I just remember Grams' dedicated Hammond extension box, three springs hung in a 24" or so arch.
So I'd be like 12 being told not to be 'poking around in there

Damn. Early 'Hammond' experience as 'entry level toxin'