Rob Flinn
Well-known member
Scenario as follows:
I have a reverb tank that was pulled from an old organ. I made the driver circuit using Craig Andertons design here
http://sendling-info.blogspot.com/2007/01/spring-reverb-design-by-craig-anderton.html
When inserting a sine wave into it I was getting bad distortion, I think because the tank was too low impedance. Because if I put a 100ohm resisitor in series it was OK, but there was practically no level.
I checked at accutronics page & was measuring around an ohm on the i/p coil which indicated that I had the 8ohm tank. So I rebuilt the circuit using this diagram for the driver with a BD135 & BD136 for the transistors
http://www.accutronicsreverb.com/drive5.pdf
Result .......... exactly the same as without the transistor buffer ???
Does this indicate the tank has a damaged primary ??? Do I need more meaty drive transistors ?? Should I give up & buy a digital reverb with a spring emulation ? Will the digital spring emulation splash if I slap the side of the box ??
I have a reverb tank that was pulled from an old organ. I made the driver circuit using Craig Andertons design here
http://sendling-info.blogspot.com/2007/01/spring-reverb-design-by-craig-anderton.html
When inserting a sine wave into it I was getting bad distortion, I think because the tank was too low impedance. Because if I put a 100ohm resisitor in series it was OK, but there was practically no level.
I checked at accutronics page & was measuring around an ohm on the i/p coil which indicated that I had the 8ohm tank. So I rebuilt the circuit using this diagram for the driver with a BD135 & BD136 for the transistors
http://www.accutronicsreverb.com/drive5.pdf
Result .......... exactly the same as without the transistor buffer ???
Does this indicate the tank has a damaged primary ??? Do I need more meaty drive transistors ?? Should I give up & buy a digital reverb with a spring emulation ? Will the digital spring emulation splash if I slap the side of the box ??