Duncan Convertible Combo Owner'S Manual Download Page 1 | Manualshive

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Summary of Contents for Convertible Combo

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Page 2: ...t s in your head To provide that versatility many unique and exclusive features are built in This manual will show you the easy way of getting a wide variety of great sounds just by properly setting up the amp Enjoy it If you have any comments about the design of your amp I d like to hear from you If you have any ideas for modules or other related products please write me at the address below Than...

Page 3: ...box and packing material will be necessary for shipment These are carrier approved packing materials and they will insure safe transit back to the factory Specifications for 100 watt Convertible Amps Combo Head Weight 57 lbs 42 lbs Cabinet Dimensions 19 3 4 h 10 15 16 h 18 25 32 w 21 25 32 w 11 3 8 d 11 1 16 d Power Requirements 120 volts a c U S models Power Consumption 480 watts at full rated ou...

Page 4: ...ge 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: ...p be 10 to 20 times higher than the pick up output impedance to avoid excessive loading UNIOUE DESIGN PICKUPS LOW IMPEDANCE PICKUPS To optimize signal to noise ratio input impedance should be fairly low typically 100 to 10k ohms Try the lOk330pf load resistor plug for great tone and low noise PIEZO TRANDUCERS built in to acoustic guitars To avoid loading down Piezo pickups the input impedance shou...

Page 6: ...n counterclockwise decreases distortion Like all of the preamp controls on this amp each channel is independent You can have a clean setting on one channel and a distorted setting on the other channel 5 MASTER VOLUME This control sends the signal volume from the preamp to the power amplifier For the cleanest signal turn the Master Volume up high and keep the Overdrive low but not off For the dirti...

Page 7: ...ls let you change the low end response of your amp Each is a low pass passive filter that can reduce the signal level 0 15 db Turning the dial clockwise increases the low end response 9 REVERB These controls let you set the amount of reverberation you want in your sound Turn the reverb control clockwise to increase the amount of reverb and counter clockwise to decrease Some players prefer no rever...

Page 8: ...nd distortion that is heard only on small amplifiers Variable Power is not like typical preamp overdrives The Variable Power circuit actually controls the cutout stage of the amp When the Master Volume control is set low you will notice little or no change from the Variable Power control because you are asking the amp to give you very little wattage The higher you set the Master Volume control the...

Page 9: ...e under Fuse Failure for troubleshooting tips 2 ON OFF ON POWER SWITCH This switch is designed to turn your amp on and to allow you reverse the a c polarity If you re picking up 60 hz hum from the wall current put the ON switch in the other ON position If you re using other equipment like a P A and you get a shock when touching the microphone place the ON switch in the other ON position to elimina...

Page 10: ...s directly into effects and plug the effects into the guitar input jacks on their amps With the Convertible amp you can plug your guitar into the guitar input jack and run your effects through the Effects Loop The Send Level control lets you match the Effects Loop output to the input of your effects When the level is set too low too much hiss will come through the speaker and the volume will be lo...

Page 11: ... right increases the control of the speaker the sound is crisper and tighter Low damping turning the control to the left decreases the control of the speaker the sound is looser and fatter sounding with slightly more presence There is no recommended setting because only you can tell what s best for the sound YOU want to produce This control is effective ONLY when the speaker is connected to the Va...

Page 12: ...ositions 1 3 and 5 In this section you will find a number of different module arrangements and the sound produced from each To replace or rearrange modules follow the steps under Changing Modules Here is the way modules are arranged when Convertible amps are shipped Below are just some of the module arrangements you can try for different sounds Your dealer has a wide selection of modules for you t...

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Page 20: ...s handle 3 Insert the module to be installed through the Quick Access module system opening It may be necessary to turn the module sideways before it will fit through the module opening 4 Align the module plug to be installed over the receptacle in the module position you have chosen 5 Slowly insert the module into the receptacle Apply moderate pressure until you feel the module is seated snugly 6...

Page 21: ...tion of the two modules Classic Hi Gain For example Classic Normal Presence Just take the two Classic modules and switch their positions If the second Classic module s tube does not have microphonics you ve solved the problem 3 Polish 1 2AX7 tubes are constructed differently than the Tungsrams Although Polish tubes are noisier and harder sounding they are less subject to microphonics Radio Shack a...

Page 22: ...reduces hum and noice especially noticeable when playing quiet passages and in the recording studio You ll notice a little label attached to the base of each tube that shows current draw When you replace your output tubes make sure to ask for matched sets to keep your amp sounding like new If you re transporting your amp often and subjecting it to rough handling there are other power tubes that wi...

Page 23: ... at 1 kHz 500k Capacitance in picofarads 3300pf Resistance in ohms 10k Sound Effect Use with acoustic pickup to enrich tone 1 meg 0 1 meg Will make tone slightly smoother sounding Other plugs that you can build yourself include Load Input Value at 1 kHz 26k Capacitance in picofarads 01 Resistance in ohms 10k Sound Effect Slightly rolled off high end Use in bright sounding room or with pickups that...

Page 24: ...ltage 3 Verify power source with something you know works 4 Defective ON OFF power switch 4 Return unit to dealer or factory for repair No sound coming from speaker s No audible amplifier hum 1 Amplifier in standby 1 Place standby switch in ON up position 2 Master Volume and or Overdrive control levels set too low 2 Increase control level setting s to 2 and listen 3 Speaker output plug disconnecte...

Page 25: ...ntrol level setting 2 Defective first stage preamp module 2 Replace module with one known to operate properly 3 Speaker output wires to amplifier shorted 3 Replace speaker cord 4 Pickup instrument or connecting cable may be defective 4 Substitute cable and instrument with one you know operates properly 5 Defective speaker s 5 Verify speakers operate properly by connecting speaker plug to speaker o...

Page 26: ...r for repair 3 Defective internal channel switching in amp 3 Return amp to dealer or factory for repair Feedback ringing 1 Master Volume and or Overdrive controls set too high 1 Lower levels 2 Too many high gain type modules used 2 Use lower gain modules or play at lower levels 3 Microphonic pickups 3 Wax pot pickups 4 Microphonic tube sound 4 Use FET module in first position It is possible to use...

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