Guided Tour - Model 3500 Front Panel
1345789101112
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MODEL 3500 350 WATTSHartke Systems
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GRAPHIC EQUALIZERTransient Attack
INPUTPRE AMP30Hz64Hz125Hz250Hz500Hz1KHz2KHz3KHz5KHz8KHzCONTOURMASTER
AB+15+15
PASSIVE456456456+12IN+9+63373737+3+25535537o0303456
28 28280-20101101010218
9 1919-3151515159
-6
OUT0100100 -9-18+18-18+18010
ACTIVE-15-15-12
TUBESOLID STATECOMPRESSIONLOW PASSHIGH PASSVOLUMEPOWER
30Hz64Hz125Hz250Hz500Hz1KHz2KHz3KHz5KHz8KHz
2613
1. Passive Input jack- If your bass guitar has passive circuitry, connect it to
the Model 3500 here. This standard 1/4� unbalanced jack provides a high
impedance (100 k Ohms) input sensitivity of 20 millivolts.
2. Active Input jack- If your bass guitar has active circuitry,* connect it to the
Model 3500 here. This standard 1/4� unbalanced jack provides a high imped-
ance (100 k Ohms) input sensitivity of 60 millivolts.
3. Pre-Amp A (Tube) control - This determines the amount of preamplification
being provided by special circuitry which simulates the sound of a classic tube
amplifier (this circuitry actually includes a real tube!). Note that when both
Pre-Amp knobs are used at equal settings, the amplifier will be twice as loud as
when only one is used. Avoid setting both Pre-Amp knobs on maximum (O10�),
since the result will almost always be undesirable distortion.
4. Pre-Amp B (Solid State) control - This determines the amount of preampli-
fication being provided by special circuitry which simulates the sound of a solid
state amplifier. Note that when both Pre-Amp knobs are used at equal settings,
the amplifier will be twice as loud as when only one is used. Avoid setting both
Pre-Amp knobs on maximum (O10�), since the result will almost always be
undesirable distortion.
5. Compression LED- Provides a visual indicator of the status of the
compression circuitry. When lit steadily green (for example, when the
Compression knob [see #6 on the next page] is set to OOff�), no compression is
being applied. When unlit, compression is being applied to the incoming signal
at a ratio of approximately 2:1. When flashing red, the compression ratio is
approaching infinity (limiting is being applied to peak signals). When lit steadily
red, the entire signal is being limited. This LED Ofollows� the incoming signal,
changing continuously as different amounts of compression and/or limiting are
being applied. For more information, see the OAbout Compression� section on
page 15 of this manual.
* Bass guitars that have active circuitry normally require a battery for the
circuitry to be functional.
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