User manual FENDER SERIES 3000

[. . . ] Channel Two is like owning a second, modern hot-rodded amp with more soaring gain than previously found in a Fender tube amp. The CLASSIC Fender tube reverb sound is there too and is switch assignable to Channel One, Channel Two, or both. Finally, a master PRESENCE control allows you to "dial-in" just the right amount of highend sparkle. Special effects will interface to the Effects Loop easily and with no guesswork on levels. [. . . ] REVERB -- Adjusts the amount of reverb present in Channel One and Channel Two. When the footswitch is connected, the reverb can be turned on and off remotely. Also see the "REVERB SELECT SWITCH" in the "Twin Amp Rear Panel Functions" section of this manual. PRESENCE -- This is a true vintage-style PRESENCE control that affects the way the power amplifier responds to upper high frequencies. As the control is turned clockwise, the power amplifier (in interaction with the speaker load) enhances upper highs, giving the Twin's overall sound a "sparkling" quality. PILOT LAMP -- When this lamp is illuminated, the amplifier is receiving power. Should the lamp burn out, turn off the amplifier and unplug it from its power source, unscrew the red jewel, and replace the lamp with type T47 light bulb. Twin Rear Panel Functions (Fig. FUSE -- The fuse is in the AC supply of the amplifier and will protect the amplifier and the operator in the event of an electrical fault. Fig. 2 If a fuse blows, it should be replaced only with a fuse in accordance with the listing at the fuse holder. If the amplifier repeatedly blows fuses, it should be checked out by a qualified technician. UNDER NO CIRCUMSTANCES should a fuse of a different type or higher rating, or a fuse bypass be used, as this could damage the equipment and present a serious safety hazard. BIAS TEST POINTS -- Used to measure output tube bias and balance with a digital voltmeter. See Output Tube Bias Adjustment Instructions below. CH. OUTPUT BALANCE ADJUST -- Used in conjunction with the BIAS TEST POINTS (item K) to set the balance between the push/pull tube sections of the power amp. See output Tube Bias Adjustment Instructions below. Output Tube Bias Adjustment Instructions -- 1. Turn on the amplifier and let it warm up for at least two minutes with the STANDBY SWITCH (item C) in the ON position and the OUTPUT SWITCH (item D) in the OUTPUT HIGH position. With a digital voltmeter set to its most sensitive DC voltage scale, measure the voltage between the two BIAS TEST POINTS (item K) labeled "BIAS" and adjust the OUTPUT BIAS ADJUST control (item J) for a reading of . 08 VDC (80 mVDC). Connect the digital voltmeter to the two BIAS TEST POINTS (item K) labeled "BALANCE" and adjust the OUTPUT BALANCE ADJUST control (item L) for 0 VDC. Make bias and balance adjustments only when necessary. If you are unsure about setting bias and balance, it is best to LEAVE THIS FEATURE ALONE, as it is pre-set at the factory. For optimum sonic performance, set bias to . 08 VDC, then set balance. [. . . ] This is done by removing the inner two 6L6GC tubes (the 2nd and 3rd large tubes, counting left to right), and setting the IMPEDANCE SELECTOR SWITCH to one-half of the total speaker load; e. g. , with a total speaker load of 16 ohms connected, the OUTPUT IMPEDANCE SWITCH should be set to 8 ohms. (Remember -- half the tubes, half the impedance. ) This will produce 60 watts RMS in the OUTPUT HIGH setting, and 15 watts RMS in the OUTPUT LOW setting. LINE CORD Your amplifier is equipped with a grounding type supply cord to reduce the possibility of shock hazard. Be sure to connect it to a grounded AC receptacle. [. . . ]