RMC - GK 13 pin Sub Filters

Started by Elantric, January 04, 2018, 10:10:59 AM

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Elantric

I encourage reading on why GK 13 pin Sub Filters were created

RMC Interview
https://www.vguitarforums.com/smf/index.php?topic=8187.0
QuoteVG-8 Input Modification

The modification I suggested for the VG-8 is a change of capacitor values in the analog "front-end" of the unit that attenuates subsonic frequencies which can otherwise enter freely and upset the performance of the overdrive and pitch shifter in some cases. This can be accomplished by a competent electronic repair tech.

The VG-8 modification is for removing the subsonic content of the separate string signals, which helps the unit perform more cleanly and without puffyness especially when using the detuning (pitch shifting) functions.

Once the driver selection and setup is done correctly, the tonal differences of the piezos (with respect to the GK-2) doesn't do anything objectionable in the circuitry. Obviously, the subsonic sensitivity of the VG-8 is more apparent when using piezos than when using a GK-2 which is a magnetic pickup slammed against the bridge where there's almost no bass to detect.

The VG-8 modification consists in changing some electronic components & testing the modified unit for function, and can be completed within 48 hours of receiving the unit. By changing 12 electrolytic capacitors in the analog front end, [frequencies] 25Hz and below don't pass much and the low-frequency saturation symptoms go away. The cost of the modification is $50. plus shipping.

There aren't any negative side effects to this mod. Everything works the way it should, only better. Subsonic filtering is like what you probably have in your stereo for the turntable preamp. It removes the weird stuff that comes with the sound and releives the circuitry of a lot of useless work. So the result is cleaner attack transients.

VG-88V2 Subsonic Input Filtering? (for RMC)
https://www.vguitarforums.com/smf/index.php?topic=916.msg12711#msg12711

RMC V9SF-001 - VG-99 Internal Subsonic Filter board
https://www.vguitarforums.com/smf/index.php?topic=568.0

RMC OPT-01 - GR-55 Internal Subsonic Filter board
https://www.vguitarforums.com/smf/index.php?topic=3236.0