* All specifications are subject to change for improvement without notice or obligation. Power Voltage: DC9 V (Battery) / DC10 V (AC-adaptor)Ĭurrent Consumption: 17 mA (9 V) / 19 mA (10 V)ĪC Adaptor: AC210N (option) Input: AC120V Output: DC9V/200 mA Center - / Sleeve +)ĭimensions (whole): 74 mm (W) x 124 mm (D) x 54 mm (H)Īccessories: 9V Manganese dry cell battery (S-006P) x 1 Power Supply: 9V Manganese dry cell battery (6F22) or special AC adaptor Switch: Normal/Effect (true bypass configuration), Filter LP/BP/HP, Drive Up/Down, Range High/Low Residual Noise: -95 dB or less (input shorted IHF-A weighted)įilter Frequency: 100 Hz 2 KHz (Low) / 200 Hz 4 KHz (High) Output Jack: 1/4 inch standard phone jack The AF-9 features Mechanical True Bypass switching via a Fujisoku 4PDT switch. After the filter network the signal is run through a unity gain buffer to provide a low impedance output. The AF-9’s Range is selected by changing the gain structure of the filters. These filters are triggered by the CdS cell side of the previously mentioned photocouplers. The effected portion of the circuit split goes into a three Op Amp filter network that is almost identical to the Mu-Tron’s, right down to the Low Pass, Band Pass, and High Pass switch that selects which portion of the filter network is used. ![]() This control signal then travels to a series of two photocouplers. The control circuit is shaped by the Sensitivity pot and amplified by an Op Amp. The AF9 starts with a unity gain buffer Op Amp and then splits the signal into control and effected circuits. These items aside, the basic structures of the two circuits are very similar. In addition, the III had a Gain pot which controlled the output level of the pedal as well as the Threshold of the Filter – this was an awkward design, as it prevented increasing the filter sensitivity without raising the output volume of the pedal. The biggest difference between the two circuits is that the AF-9 runs on a single 9V supply while the Mu-Tron ran at 18V. The AF-9 is Maxon’s version of the venerable Mu-Tron III envelope filter circuit (original version, not HAZ reissue). It is really special and you can hear it on tons of my recordings." - Marty Friedman (Solo Artist, ex-Megadeth, Cacophany) TECH TALK: This really helps you give your playing a human voice without sounding like you just stepped on an effects pedal. " The Maxon Auto Filter is one of my favorite "go-to" pedals. Three selectable filter types (Low Pass, Band Pass, and Hi Pass) and a frequency range of 100 Hz – 4 kHz allow the AF9 to function with virtually any instrument or input signal. Threshold and Peak sliders control the degree of effect while Range and Drive switches determine range and direction of the filter sweep. Opto-coupler circuitry produces the shimmering, watery filtering of legendary vintage units. ![]() The Maxon AF9 Auto Filter takes the most desirable auto-wah and swept filter effects and offers them up in a compact, user-friendly package. While change may be inevitable, if it ain’t broke, then don’t fix it. So, you can expect the latest version of this classic quacker to stand up to the original. While these changes may have been necessary, Maxon saw no reason to update the AF-9’s classic, watery, 3-dimensional filtering that so many players have to come to count on over the years. This change was made out of necessity due to the discontinuation of the fader pots that had been used on this model for nearly 40 years (original release date was 1981). Specifically, the Sensitivity & Peak faders have been replaced by rotary pots and the slider switches are now toggles. You may have noticed that the Maxon AF-9 Auto Filter has undergone a facelift.
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