drc
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Posts: 11 
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Post by drc on Feb 28, 2018 14:11:42 GMT -6
Not that I am even thinking of pulling this off myself - but I have always wondered if a pair of decent preamps on both sides of an accutronics reverb tank for input and makeup gain can do this for a reasonable price? I have a Demeter RV-1 which is pretty good. But after reading so many CAPI threads about opamp swapping and transformer choices, it got me thinking about how this approach would work with springs.
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Deleted
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Post by Deleted on Mar 1, 2018 2:06:25 GMT -6
I once had a Zerotronics Mini-LE, and very much regret letting it go. Best spring reverb I've ever heard.
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Post by johneppstein on Mar 1, 2018 11:13:19 GMT -6
Not that I am even thinking of pulling this off myself - but I have always wondered if a pair of decent preamps on both sides of an accutronics reverb tank for input and makeup gain can do this for a reasonable price? I have a Demeter RV-1 which is pretty good. But after reading so many CAPI threads about opamp swapping and transformer choices, it got me thinking about how this approach would work with springs. You'd need an accutronics tank with the correct input impedance to work with the driver preamp but other than that it should work. A lot of the newer cheap to midpriced guitar amps are driving tanks with TL074 chips... I don't think a traditional Fender tank would work as those are transformer driver with an input impedance of 4 ohms, if I remember correctly. The newer ones, like in the Hot Rod series, are IC driven. |
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drc
New Member
Posts: 11
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Post by drc on Mar 7, 2018 15:18:15 GMT -6
Thanks for the input fellas. It's just something I was knocking around as I'd like to have a spring reverb in my live rig that sounds as good as it does in my DC-30 Reverb or most of the Supers I have played. The idea of having effects return to a small mixer with an extra send on each channel so I could blend a little analog delay into the reverb with the dry signal would be ideal. It sounds like overkill most of the time but for those really quiet numbers that build up the sound of a completely dry delay repeat with a drenched original signal sounds goofy. The Demeter works but I need to run a buffered signal through a Radial XFMR box before the reverb and another one on the outputs. Sounds good but doesn't have the same quality as the reverb in my combos.
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Post by jimwilliams on Mar 7, 2018 15:52:49 GMT -6
I used to build those back in the early 1980's. I used four type 9 tanks with medium decay times, two per channel. Accutronics will do custom work. I had them reverse polarize two of the return coil magnets. Then I connected the two tank return coils in series, that created a hum cancelling design and it was very quiet with a low noise preamp.
I also reverse wired the drive coils and wired them in series. They were put into the feedback loop of the drive amp for constant current drive. In-series the tanks cancelled much of the fundamental frequency and eliminated the "sproing" surf music sounds. It sounded more like a nice plate reverb.
The last circuit was a variable 1/2 to 2/1 expander/compressor circuit wired to a single knob. Straight up was no effect. The expander decreased the reverb time, the compressor increased it. That was the variable reverb time knob.
Then I bought a lexicon.
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