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comment from Slow Pony-- I love this circuit and have used it successfully in many L and M series organs changing resistor, pot and cap values to taste. Also worth mentioning this circuit is not a good way to hookup to a Leslie (generally need lower impedance/more volume). However I do use this circuit very successfully to pad down the organ for FX pedals to then preamp for a Leslie.
-Now here's the IMPORTANT SERVICE NOTE
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Now here's the IMPORTANT SERVICE NOTE
The older M3 Hammond's (and possibly others) with the field coil speaker design don't play well with this circuit. It will work but from my experience two field coil M3s I have seen using this design on the OBL2 have subtle issues related to how it plays with the circuit and it's grounding. If grounded to amp chassis, the circuit volume will drop severely, as will the internal speaker volume.
A solution for a different output I found for this balanced style output is to use a 10uf(?) cap and resistors (I omitted) to a STEREO potentiometer so both speaker terminals resistance to ground can be adjusted simultaneously. This gives me a balanced output which is nice and hot but can be padded down as much as needed. The design for the switched speaker/mute with an 8ohm resistor remains the same. And of course you can then use an unbalanced TS cable anyways but somehow it still sounds way better, likely due to that extra 10uf cap on the other speaker terminal wire. Thanks!
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TopicHookup
TopicModification
