Mikenewport
New member
Hi all,
I have recently come into possesion of a Fretking Gordon Giltrap Mk.1. It is brand new but has been discontinued long since. P90 neck, humbucker bridge and a power bridge style acoustic pickup. I'm experimenting with pickups as the originals sound less than good otherwise I would have left well alone.
My call for help is regarding the acoustic side of the equation. I can 'read' all of the circuit until it comes to the voulume pot. The signal enters the pot on the wiper (middle tag) and leaves the pot via the left tag when viewed looking into the control cavity. I realise this is an alternative arrangement as I have seen it shown on Lollar's site. It then leads to the switch with options for passive, active or both pickups.
As the signal leaves the volume pot it passes immediatey through a 20K ohm resistor. I presume the purpose of the resistor is to attenuate the amplitude of the acoustic pickup. What I would like to do is put a 20K ohm trimmer pot in place of the resistor, so that I can better balance the passive and active circuits.
Will the trimmer pot work and how is it wired? The Bourns trimmer pot I am looking at has three tags numbered 1,2 and 3. Would it be an idea to use a multi meter to check across the tags to look for an alteration when turning the adjustment screw. Does the attenuated amplitude go to ground as in a volume pot or is it just 'squeezed' through as in a resistor.
I would be greatful for any sort of response, link or diagram.
Many thanks, Mike
I have recently come into possesion of a Fretking Gordon Giltrap Mk.1. It is brand new but has been discontinued long since. P90 neck, humbucker bridge and a power bridge style acoustic pickup. I'm experimenting with pickups as the originals sound less than good otherwise I would have left well alone.
My call for help is regarding the acoustic side of the equation. I can 'read' all of the circuit until it comes to the voulume pot. The signal enters the pot on the wiper (middle tag) and leaves the pot via the left tag when viewed looking into the control cavity. I realise this is an alternative arrangement as I have seen it shown on Lollar's site. It then leads to the switch with options for passive, active or both pickups.
As the signal leaves the volume pot it passes immediatey through a 20K ohm resistor. I presume the purpose of the resistor is to attenuate the amplitude of the acoustic pickup. What I would like to do is put a 20K ohm trimmer pot in place of the resistor, so that I can better balance the passive and active circuits.
Will the trimmer pot work and how is it wired? The Bourns trimmer pot I am looking at has three tags numbered 1,2 and 3. Would it be an idea to use a multi meter to check across the tags to look for an alteration when turning the adjustment screw. Does the attenuated amplitude go to ground as in a volume pot or is it just 'squeezed' through as in a resistor.
I would be greatful for any sort of response, link or diagram.
Many thanks, Mike
