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The P-Retro is simple but flexible active/passive bass preamp equaliser which offers huge tonal variation to one of the most
popular styles of bass of all time, without the need to permanently modify the instrument itself. P-Retro features two stacked
knobs each with a pull switch, class A FET input stage and a high quality relay for pure passive bypass. Power is provided
by an internal rechargeable battery.
The normal volume control becomes the Volume/Tone Stack and works in exactly the same way as the P style bass original
controls, passing the passive signal directly to the jack. When the volume control is pulled up, the active circuit is switched
in, post passive tone control, and adds 2.5dB of gain, with a flat response. Additionally, the upper knob allows either a mid
boost, or a combined bass/treble boost. The lower knob sets the variable frequency points for either mode.
Summary of features for the P-Retro:
• Two Stacked knobs, both with Pull Switches.
• Original pure P style bass controls fully retained via passive path, using a high quality relay bypass.
• Class A FET input stage.
• Flat response active setting.
• Variable frequency mid boost mode.
• Variable frequency combined bass/treble boost mode.
• Deep boost switch with four frequencies, set via internal switches, and Bright option.
• Deep boost level set via internal preset trimmer.
• Rechargeable internal Li-Pol Battery, giving up to 40 hours use per charge.
• Battery charging is achieved using an AC/DC Adaptor, which plugs into the jack.
• Auto passive bypass if the system runs low on power.
• Easy to fit using screw terminals, with no solder connections to the P-Retro.
• Instrument can be returned to stock condition since there are no physical modifications to the bass.
• P-Retro Active circuit board approximate dimensions: L50.0 X W27.0 D15.0 mm (2.0" X 1.07" X 0.6")
• P-Retro Volume/Tone & Li-Pol battery approximate dimensions: L50.0 X H29.0 X D19.0 mm (1.6" X 1.15" X 0.75")
Active/Passive Retro-Fit for P-Style Basses
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Summary of Contents for East P-RETRO 01
- Page 1 Active/Passive Retro-Fit for P-Style Basses The P-Retro is simple but flexible active/passive bass preamp equaliser which offers huge tonal variation to one of the most popular styles of bass of all time, without the need to permanently modify the instrument itself. P-Retro features two stacked knobs each with a pull switch, class A FET input stage and a high quality relay for pure passive bypass.
- Page 2 Active/Passive Retro-Fit for P-Style Basses • OPERATIONAL DESCRIPTION The P-Retro is based on a novel dual mode circuit which has a flat response setting, a conventional variable frequency mid range boost, as well as a combined bass/treble boost. A ‘deep’ setting is available too, as well as a bright option. NOTE: With regard to knob rotation: CW = Turning a knob up towards maximum or clockwise ACW = Backing a knob off, turning it anti-clockwise or counter-clockwise...
- Page 3 Active/Passive Retro-Fit for P-Style Basses • ACTIVE WITH A FLAT RESPONSE CENTRE CLICK • Setting active mode when the Upper Knob (Upper knob) (active stack) is set in its central click, adds a little boost with a flat response. • There is an option for a slightly brighter sound by setting an internal switch to on.
- Page 4 Active/Passive Retro-Fit for P-Style Basses • VOLUME TONE STACK Works purely passively at all times and is designed to function exactly as the standard Volume and Passive Tone in a P Style Bass. This is in order that the wonderful stock sounds are always available, with no compromise. • VOLUME IN PASSIVE (Upper Knob Pushed Down) When the upper knob is in its down position, the system is bypassed via a high quality relay with gold plated contacts.
- Page 5 Active/Passive Retro-Fit for P-Style Basses • First plug the Special Jack Charger Adaptor into the guitar jack socket. • Then plug the connector on the end of the charger output lead into the Special Jack Charger Adaptor. • Lastly, plug the charger into an AC Mains socket and switch on. •...
- Page 6 Active/Passive Retro-Fit for P-Style Basses normally a black ground wire connected to the bridge which is soldered to the jack ground, and there may be others, depending on the age and type of instrument. • Once the pickguard has been separated from the bass, move to a surface where it will be protected while you work on it.
- Page 7 Active/Passive Retro-Fit for P-Style Basses • FITTING THE P-RETRO CIRCUIT TO THE PICKGUARD Note: Do not have the rechargeable battery pack plugged into the P-Retro during the installation. • Remove the top nut and washer from the P-Retro Active circuit board (the one with the jack attached), leaving the back nut and washer on the pot thread.
- Page 8 Active/Passive Retro-Fit for P-Style Basses • WIRING THE PICKUP & OTHER CONNECTIONS • Take the flat 4 way Flexi-Wire and push the pins on one end into the 4 way socket on the P-Retro Active circuit board. Make sure it is pushed in straight, fully home, taking care not to bend or fracture any of the pins. •...
- Page 9 Active/Passive Retro-Fit for P-Style Basses • ACCESS FOR INTERNAL SETTINGS The internal switches and trimmer, which set up the Deep parameters, are positioned in order that they are accessible when the strings are in place. • Refit the pickguard screws except the 6 on the ‘control tail’ surrounding the jack and controls. Tighten the other screws but not so they are fully down.
- Page 10 Active/Passive Retro-Fit for P-Style Basses • SETTING THE DEEP BOOST FREQUENCY & LEVEL The Deep Boost is a gentle peaking curve with the maximum boost at the frequencies specified. But being a gentle curve, it will have a significant effect on frequencies above and below the chosen frequency. Take care when choosing the setting, as differences are much magnified when going from a quiet set-up at home, to a rig in a boomy venue.
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Page 11: Care And Safety
• Do not allow this unit to get wet or expose it todamp conditions. GUARANTEE • Your East product is guaranteed to be free from defects in materials and workmanship for a period of one year from the date of original purchase.
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