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Table of Contents
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Summary of Contents for Duncan Convertible Head
- Page 2 If you're like most musicians I know, the first thing you want to do is plug-in your new amp and start playing - the last thing you want to do is read an owner's manual. Go ahead and play the amp and see what it can do for you. Once you've completed the "breaking in"...
- Page 3 Unpacking Inspect your Convertible amp for hidden damage that may have occurred in transit. Your amp was inspected and sound tested before shipment from the factory. All claims for shipping damage must be made by the receiver. Save your box and packing material for evidence of damage if it has occurred.
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Page 4: Table Of Contents
Table of Contents Front Panel Controls……………………………………………………………………Page 4-5 Rear Panel Controls..………………………………………………………………..Page 6-7 Module Arrangements………………………………………………………….………Page 8-9 Preamp Modules………………………………………………………………….…Page 10-11 Changing Modules……………………………………………………………………..Page 12 Tubes Preamp………………………………………………………………….…..……Page 13 Power………..……………………………………………………………………………Page 14 Load Resistor Plugs……………………………………………………………………..Page 15 Trouble Shooting…………………………………………………………………….Page 16-18 Blank Module Arrangements……………………………………………………….Page 19-20... - Page 5 1) LOAD RESISTOR INPUT (Combo only) Guitar pickups have different output voltages. Using the load resistor plugs supplied with your combo amp, you can match your pickups to the amp's input. STANDARD ELECTROMAGNETIC PICKUPS Convertible amps have 4.7 meg-ohm input jacks. Some players prefer using no load resistor plug because they want the brightest sound possible and 4.7 is a good match with their pickups.
- Page 6 3) AUXILIARY GUITAR INPUT: Use this input for a second guitar or other instrument. This is a parallel input to the Main Guitar Input so they will both play through the "on" channel. If you use the Auxiliary Input for a second instrument, the output volume from both instruments will be reduced.
- Page 7 When you re using "Low-Cut" modules the bass controls will have less effect on your sound because the module s rolling off much of the bass response. The 'Presence' module will be greatly affected by the treble control (See pages 10-11 Preamp Modules for other tone you can get with different modules) TREBLE TONE CONTROLS: These controls you change the high-end response of your amp Each is a high-pass passive that can reduce the signal level 0-38 db with a 6 db per...
- Page 8 The Seymour Duncan footswitch L.E D will glow only when you're playing through the top channel. Some amps produce a loud 'pop" through their speakers when channel switching The...
- Page 9 1) FUSE HOLDER: The fuse is located in the cap of the fuse holder. If the fuse fails, it must be replaced with one that provides proper current protection or you will void the warranty. The proper fuse rating for the 110-120 v.a.c. Convertible amp is 5A 250V slo blow.
- Page 10 With the Standby switch in the up position, your amp will be on With the Standby switch in the down position, Standby will be in operation and no sound will come from the amp. 4) A.C. CONVENIENCE OUTLETS: These outlets let you plug in other equipment for a.c.
- Page 11 Convertible amps are designed with Accutronics 2-spring reverbs. These are the most natural sounding reverb units available and they provide a wide range of reverb for your playing styles. 7) PENTODE/TRIODE SWITCH: This switch changes the operation of the EL-34 output tubes, which use five components inside each tube.
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Page 12: Front Panel Controls
MODULE ARRANGEMENTS Your amp was shipped with the modules arranged in the configuration drawn below. Remember your guitar signal runs in series through three modules per channel before reaching the amplifier. The modules for the red channel are in positions #1, 2, and 4. The modules for the green channel are in positions #1, 3, and 5. -
Page 20: Changing Modules
CHANGING MODULES The five factory installed preamp modules are located directly under the Quick Access module system plate on the top of the amp. Changing modules is quick and easy. Dramatic tone changes are possible just by rearranging your present module configuration. -
Page 21: Tubes Preamp
TUBES Just like all other parts in the Convertible amps, the tubes were selected for providing the most musical tones. Tubes can be temperamental, but there are things that can be done to avoid problems. Module Preamp Tubes The 1 2AX7 Tungsram tubes will give you the least amount of noise and the sweetest tone. -
Page 22: Power
SPARE TUBE There is a spare 12AU7 tube mounted inside your Convertible amp. This is a stock replacement tube for the Cascode module. We also discovered an interesting sound when replacing the standard 12AX7 tube in the Classic module with a 12AU7 tube. If you use a Classic module in the input stage (first position), try using the 1 2AU7 tube there. -
Page 23: Load Resistor Plugs
Various capacitance and resistance values are given, with a description of their overall effect on your sound. With each Seymour Duncan Convertible Combo amp YOU receive the following two (2) load resistor plugs:... -
Page 24: Troubleshooting
Seymour Duncan Service Center or call (805) 964-9610 for a Return Authorization number. Symptom... - Page 25 cable not properly cable is plugged into grounded instrument 3) EL-34 power tube 3) Replace EL-34 shorted Amp blows a fuse after 1) Wires from speaker to 1) Replace speaker cord several minutes of amplifier shorted operation 2) EL-34 or 5U4GB power 2) Replace tube tube defective 3) Return amp for repair to...
- Page 26 Return circuits factory 5) Tap the reverb tank with 5) Springs are stuck your hand. 1) Use the panel mounted Channel selector 1) Channel Selector on channel selector to set the Footswitch does not amplifier set to channel 1 amp in channel 2 (indicated change channels position by the green L.E.D.)
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