piezo-one™ P1-2 (Telecaster® ashtray style barrel style saddle replacement)
Operation and Installation:
P1-2 Saddle Operation & Installation
Brenner piezo-one™ gang guitar saddles are designed for simple, reversible installation that is non-destructive to the instrument. The design features string supports that are machined for maximum sonic engagement with the piezo elements. This electro-mechanical arrangement produces a stronger output, frequency response, and dynamic range in comparison to other piezoelectric transducer saddles. Machined-in compensation is optimized for both intonation and low action when using commonly incremented “unwound G” string sets. The saddles are compatible with all preamplifiers designed for piezo transducer use.
The P1-2 model is our “barrel” saddle design, for installation on guitars with vintage Telecaster ashtray style bridges having 3 barrel type saddles. Measure center-to-center distance of outermost compensation screws or plate holes Bridges having 1.686” (42.8mm) -1.730” (43.9mm) spacing are compatible. Insure that tuned intonation points on your guitar are approximately HIGH E = ⅞” and LOW E =23/32” measured from the back edge of the bridge. Standard saddle stud length provides additional ⅛” (3.2mm) of adjustment.
Piezo transducers have very high impedance, and produce very little current. Passive volume/tone controls degrade the signal strength. It is for this reason that the best piezo transducer systems implement a preamplifier stage followed by volume/tone control. Some onboard preamps are capable of blending piezo and magnetic signals in both mono and stereo modes. Blended mono output combines magnetic and piezo sound into one signal. The best sounds will always be produced in stereo mode with magnetic pickups sent to a conventional guitar amp, and piezo signal routed to an acoustic amp or PA system having 2 or 3 way speakers. A stereo cable is typically used to output both signals from the instrument. The cable’s plug tip and ring will carry the magnetic and piezo signals respectively. A stereo splitter optimally separates the signals into two mono outputs for guitar amp, and full range system.
Our outboard PIEZO-PRO-V preamp/splitter/vol-control unit combines piezo preamplifier, signal splitter, and post-preamp volume control into one stage friendly device. Blend signals much faster by using existing guitar control with PIEZO-PRO-V foot control. The PIEZO-PRO-V eliminates the need to install expensive onboard piezo preamps in each guitar or alter existing pickup wiring.
It is possible to add passive volume control to the instrument, but some tone and signal loss will occur as mentioned previously. Losses can be minimized by selecting components that best match the input impedance of the piezo preamplifier. A .0003 mf capacitor and 300K ohm resistor series wired across the input and output lugs of a 500K potentiometer work nicely with the PIEZO-PRO-V (volume treble bleed circuit). Components will vary for optimal sound with other preamps. Stacked or concentric potentiometers offer a great solution for adding piezo volume control without the need to drill additional holes into the instrument.
The following instruction describes piezo-one™ installation for magnetic/piezo hybrid guitar without passive control or onboard preamp. If choosing to install an onboard preamp, refer to the manufacturer’s documentation for additional steps.
Installation: The BrennerUSA website includes a gallery of installation photos that may help in planning installation. Remove strings. Measure and note dimensions on outer most strings (guitar high E, and low E strings) for height above the bridge plate. Measure and note the distance from the back of the bridge to the outer string intonation points (string /saddle contact point at the front of each saddle). Remove string saddles. Identify magnetic bridge pickup height adjustment screw for wire guide installation (shown on front picture). Place wire guide nearby. While holding the magnetic bridge pickup in position, remove the screw. This will keep spring in position under the plate. Put wire guide on screw and reinstall as pictured. Remove the bridge assembly. Pull up on the magnetic pickup to raises screw heads and wire guide for easy wire installation. Thead piezo wire through the slot underneath the wire guide and through the pickup hole along side the of the magnetic pickup. Pull the wire through leaving slack for proper saddle position and adjustment. Adjust magnetic pickup height adjustment screws and wire guide as desired.
DO NOT remove jam nuts securing the threaded intonation rods to the back of the piezo saddle. Remove intonation adjustment nuts from the intonation rods leaving springs in place. Slide intonation rods through corresponding holes in bridge plate. Attach saddle by replacing intonation nuts. Remove electronics and jack plates. Run the piezo wire to the location of the guitar output jack. Reposition the piezo wire to leave some slack for saddle adjustment. Re-mount bridge assembly before adjusting intonation. Piezo-one saddles are equipped with three height adjusting set screws. String height should be established using outer set screws while center screw is backed off. The center screw is provided for center support after height is established. Adjust intonation nuts and height screws to properly position the P1-2 saddle to previously noted dimensions. It may be necessary to notch the pickguard or pickup ring to accept the piezo wire on other guitars. You may prefer to save the integrity of original parts and purchase a replacement ring or pickguard for this purpose.
Identify and note colors of magnetic pickup signal wire (attached to the jack “tip” connector), and ground wire (attached to the jack “sleeve” connector) on existing TS jack. Connect these wires to corresponding “tip” and “sleeve” connectors on the new stereo TRS jack supplied. The piezo output wire is a coax type cable with a center signal wire separated from a surrounding braided shielding wire. The plug end is used in some onboard preamp installations, and factory testing. Cut the plug end off. Strip and peel back the braided shield wire to expose the signal wire. Strip the signal wire for solder connection. The piezo cable’s outer shield wire automatically connects to ground when the saddle is mounted on a metal bridge plate that has been grounded (typical on most electric guitars). Grounding can be testing between the bridge plate and jack sleeve (ground) tab with continuity tester or multimeter. The piezo pickup’s shield wire may be combined with the guitar jack’s ground connection, but this may result in noise or “hum” from a ground loop condition. The piezo pickup’s shield wire must be connected to the jack’s “sleeve” connection for installation on instruments with non-metallic bridges, or on instruments without magnetic pickups. The shield wire can be peeled back a bit, and covered with shrink tube or electrical tape in most cases. The piezo signal wire should be connected to the “ring” connector on the TRS jack*. Reinstall electronics and jack plates. Insert an audio cable plug into the jack to insure that it is able to go in all the way. On some Strat style jack plates – the stereo jack may be slightly longer and cause the plug tip connector to hit the wood. If this happens, try rotating the jack to a new position. If this doesn’t solve the problem, It may be necessary to carve some wood at the point of obstruction. Install strings. Recheck noted dimensions and make sure center height screw is snug for support only. Loosen strings when adjusting intonation.
The guitar will now function as before with a mono cable inserted – magnetic pickup(s) only.
With a stereo cord inserted, the guitar outputs magnetic signal through the tip, and piezo signal through the ring of the stereo plug.
* the piezo signal wire can be connected to the jack’s “tip” connector for guitars with piezo only (including nylon string guitars).