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Discussion in 'Pickups & Electronics [BG]' started by xaxxat, Dec 24, 2012.
Anyone have any drawings/pics of G&L's Passive Bass Treble circuit?
If you're talking about the passive bass and treble controls common to G&L basses, that's nothing more than a standard tone control, plus a capacitor in series with the signal path, with a 1M pot parallel to the capacitor.
There is a schematic of it somewhere. I'm on my phone, so I'll have to search for it later.
Here you go.
I ran across this pic. Is it not a L-1000? It looks quite different from that schematic.
This one is different too.
Both schematics are, from C3 to the output, functionally the same. To change how the bass sounds when the treble control is fully open, use a 250K VR3 for a vintage one with less treble, and a 500K VR3 if you want a modern tone with more zing.
C3 is probably there to give a bit more growl to the tone (a lower resonant frequency) even with VR3 fully open, and R1 gives it a generally brighter tone with more resonance (a higher peak). As for the SW1/C2 combination, that gives the series mode slightly less muddiness.