I have a Biamp SR-240 spring reverb that is my go too for anything requiring that type of thing. However, it's always had a bad 60cycle (and associated harmonics) hum. I usually filter it out with a noise reduction plugin but want to start using it outside the box with my tape machine and I'd love to get that hum down.
Not sure where to start.
I have very little use for the EQ, wet dry blend and input limiting functions. I can achieve all of this with ouboard gear and plugins. Also, I never plan on selling it so I'm all for function over form in thus case. I've considering nuking all of the extra circuitry and just rebuilding the drive and recovery circuit based on the schematic and adding balanced I/O but that just seams mean.
I should probably try and rule out a simple fix first.
My gut says (in this order):
1. Replace power supply electrolytics and try a different power supply. Try moving the power supply to external enclosure.
2. Replace all electrolytics.
3. Play with tank input wiring, shield grounding, routing etc...
4. Try bypassing the EQ and Input Limiting sections.
5. Replacing pots and/or opamps
Does anyone have any insight into what else I might try?
Schematic and Manual attached.
Any help is mucho appreciated
Not sure where to start.
I have very little use for the EQ, wet dry blend and input limiting functions. I can achieve all of this with ouboard gear and plugins. Also, I never plan on selling it so I'm all for function over form in thus case. I've considering nuking all of the extra circuitry and just rebuilding the drive and recovery circuit based on the schematic and adding balanced I/O but that just seams mean.
I should probably try and rule out a simple fix first.
My gut says (in this order):
1. Replace power supply electrolytics and try a different power supply. Try moving the power supply to external enclosure.
2. Replace all electrolytics.
3. Play with tank input wiring, shield grounding, routing etc...
4. Try bypassing the EQ and Input Limiting sections.
5. Replacing pots and/or opamps
Does anyone have any insight into what else I might try?
Schematic and Manual attached.
Any help is mucho appreciated