Spring reverb surprise.

[Tony Allgood]

Hi all,

I had a few busted spring line reverb tanks stashed away, and today I
managed to get one working one from all the good bits in each one. Its
the first time I have played around with these things for myself. I
heard Steve Ridley's Accessit reverb some time ago and promised myself
to build one up. I am really was quite surprised how good it actually
is. My previous experience with springlines is hum ridden, noisy units
in guitar amps. With a decent driver and signal recovery circuit, they
really are very good. Mine will now be going in the base tray of my
Soundcraft Delta mixing desk as a permanent feature. I used a 5534 as
the driver with the coil in the feedback loop, to give V-I conversion.
This will give a better H.F. response than the usual voltage drive, as
seen on most git amps. I had to hack the phono sockets on the tank
though, Accutronic's had grounded one of the terminals to the case, this
is bad. The pick up amp was another 5534 with a gain of 100 at pass
band, LF cut off at about 250Hz and H.F. roll off at 16KHz. Building the
amps right onto the tanks case ,star earthing and grounding the tank's
enclosure produced a very quiet unit. Super.

Regards,

Tony Allgood, Cumbria, UK

Rack mounted moog filter and the TB3030 SuperBassline projects:

http://aupe.phys.andrews.edu/diy_archive/schematics/oakley/