Maxon Super Tube Pro PLUS (ST9Pro+)
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- Updated Reissue of 1980’s Super Tube Screamer
- Circuit Based on classic OD-9/OD808
- Dedicated Midrange knob to dial in amount of mid boost
- Low Boost Switch adds low end punch – great for single coils
- 9-volt or 18-volt regulated operation (switchable)
- True Bypass Switching
Bigger, Badder, Bolder – these are the best three words to describe the ST-9 Pro+ Super Tube. The latest and possibly last incarnation of Maxon’s legendary 808, the ST-9 features more output, more gain, and more tonal options for the player who simply needs – well, MORE.
Starting with a circuit loosely based on the classic 808 architecture, the ST-9 adds a Mid Enhance knob to control the amount of midrange boost. This knob functions similarly to an amp’s presence control, boosting perceived volume and gain as it’s turned up.
You may be wondering why an 808-style pedal would need more presence – allow us to introduce you to the ST-9’s Low Boost switch.
The Low Boost switch is the ST-9’s secret weapon – This unassuming switch completely changes the character of the pedal, adding beefy low end and increased saturation via a LP filter and an alternate set of clipping diodes.
If this wasn’t enough, the ST-9 also offers 9- or 18-volt operation via an internal charge pump. Run at 9 for the classic 808 sound and feel or switch to 18 for increased headroom, improved dynamics, and a bigger, chunkier tone to the overdrive.
From bluesy overdrive to diabolical dirt box, the ST-9 is a devilishly diverse pedal that can punish a clean amp or turn a dirty amp into a wall of doom.
The OD808 re-imagined with increased output level, additional saturation and a more diverse palette of tonal options.
Input signal goes to a 2SK246 jFET buffer that provides a high input impedance and low output impedance into the 1st Op Amp, a NJM (JRC) 4558D. This 1st 4558 is set up as a tweakable mid boost, with a potentiometer controlling the gain of the boost. The signal goes from the mid boost Op Amp to the second clipping Op Amp, which is set up for a 10 to 110x gain with switchable sets of diodes in the feedback loop and a switchable capacitor to boost bass.
After the clipping Op Amp the signal is routed to an 808-style tone control and unity gain amplifier, after which the signal is passed through a volume potentiometer, another unity gain amplifier (to provide low output impedance) and then the true bypass switch. The use of these unity gain amplifiers helps to preserve high end in the signal which can be lost when passing through the volume control.
The ST9 Pro+ uses an NJM2374A Voltage converter to double the 9V input to 18 VDC, providing more clean headroom before the Op Amps distort. The ST9 circuit is switchable between 9 and 18VDC via an internal switch.
The ST-9 Pro+ features Mechanical True Bypass switching via a Fujisoku 4PDT switch – the input of circuit is switched to ground when bypassed.
NOTE ON POWERING THE ST-9 Pro+ - this pedal’s voltage regulator IC requires a high inrush current of approximately 2000 mA upon startup. When using with a Power Brick such as the Voodoo Labs Pedal Power 2+, this pedal should be connected to a high current power jack when possible.
If it is not possible to connect to a high current jack, you can power the ST-9 Pro+ by leaving a battery in the pedal. Upon initial start-up, unplug the external DC power input cable, engage the pedal, and then plug the DC power input cable back in – the pedal will now power up normally off the external power supply until you power down your pedalboard.
All New products are covered by the manufacturers new warranty. Please check their website for the length of warranty and warranty conditions.
If an item you receive is faulty get in touch with us ASAP.
Second Hand products come with a 4 week warranty from us. If there is an issue let us know ASAP!
This covers normal use and does not cover accidental damage, misuse, wrong power plugged into it, modding, water damage or any other damage caused by mistreatment.
Just treat it nice and all will be good!
We send A LOT of packages every week so don't worry about the shipping side of things!
We've never lost a thing and your awesome new gear will be packed up really well to avoid any damage in transit.
If your order comes in before 2pm we will ship it same day. Most of the time we pack things up all the way to 4pm so just call if you need it to leave same day after 2pm.
We ship mainly with Australia Post but may use a courier depending on location and size of the package.
Free Post ships with Australia Post standard and expected shipping times are between 4-6 business days depending on location. It will be longer to outside of metro and rural areas.
Express Post will usually be with you next business day in metro areas of QLD, NSW, SA, VIC and TAS. WA will take 2 days to metro and extra days after that to out side metro and rural areas.
Everything we ship has a tracking number with the exception of some power cables and smaller envelope packages. You will be emailed tracking once your order has been shipped!
"LOVE IT Or Exchange It Within 14 Days"!
The item MUST BE sent back in the same condition it arrived in and have all the materials it arrived with (manual,warranty card,all accessories) and be packaged in the original box.
Items returned in undesired condition (scratched,chipped, etc) will be subject to a restocking charge of up to 30%. Modded items will not be refunded!
Postage must be paid by the purchaser to get the item returned to us and we will exchange at our discretion the amount of the products but not the postage costs.
Items must arrive here within 14 days of your order being placed.
Some items cannot be returned like Pedalboards you have already put velcro on, strings, pedalboard tape, Cables and DIY cable kits.
Please don't use the Manufacturers box as the packing box or you will automatically be charged a 30% restocking fee!
Email us BEFORE returning your items so we can resolve or sort out any problems you may have and just so we know to expect the item. You may also want to insure or register your item as we don't take responsibility for lost or damaged post.