Oldfield 6750 User Manual Download Page 7

7

Controls And Features

1 - 

Amplifier Input - Bright Channel:

 Connect 

your instrument with a high quality instrument 
cable to the Bright jack to use the Bright 
channel of the amplifier only. (Note - Bridged 
channel mode will not work if the instrument is 
plugged into the Bright channel jack.)

2 - Amplifier Input - Normal Channel: 

Connect your instrument with a high quality 
instrument cable to the Normal jack to use the 
Normal channel of the amplifier or to use the 
amplifier in “bridged channel” mode.

3 - Mid+ Switch: 

The mid+ switch is used to 

boost the middle frequencies of the amplifier’s 
tone.  With the switch engaged (Up Position) 
the volume will become slightly louder and the 
tone will become warmer.  This function is great 
for solos and is controllable through the foot 
switch as well as the front panel.  The panel 
switch must be in the up position in order for the  
foot switch to function correctly

4 - Channel Bridge Switch: 

With the channel 

bridge switch engaged the guitar signal is sent 
to the normal channel and the bright channel 
simultaneously.  The result is a slightly elevated 
volume and the tonal characteristics of each 
channel contribute to the overall amplifier tone.  
The instrument must be plugged into the normal 
channel jack in order for channel bridging to 
work.

5 - Bight Channel Volume: 

 This control 

determines the overall volume of the Bright 
channel.  Rotating the control clockwise will 
increase volume and increase the harmonic 
distortion of the amplified guitar signal.

6 - Normal Channel Volume:  

This control 

determines the overall volume of the Normal 
channel.  Rotating the control clockwise will 
increase volume and increase the harmonic 
distortion of the amplified guitar signal.

 7 - Treble: 

This control determines the amount 

of treble frequencies present in the amplifier 
tone. At the max setting the amplifier is at its 
brightest. This control also adds a bit of bite to 
the amplifier tone as it is turned towards max. 

8 - Middle:

 This control determines the amount 

of mid frequencies present in the amplifier tone. 
It should also be noted that as the middle 
control is turned towards the maximum setting 
the player will notice that the treble and bass 
controls have less effect on the overall tone. 

9 - Bass:

 The bass control determines the 

amount of bass frequencies present in the tone. 
Turning this control too far towards maximum 
could result in the overall tone becoming too 
muddy or boomy. 

Summary of Contents for 6750

Page 1: ...1 Oldfield Amplifiers User Guide 6750 6750 JC 67100 67100 JC...

Page 2: ...ampli fi er is built to provide you with the best tonal experience and durability available in a guitar ampli fi er As with all Old fi eld s it is hand built with you the player as the central focus o...

Page 3: ...3 Table Of Contents Important Safety Instructions 4 5 Overview 6 Panel Controls And Features 7 9 Tube Layout 10 Foot Switch Controller 11 Operation Notes 12 13 Warranty 14...

Page 4: ...a three prong grounded plug This is a safety feature If you are unable to insert the plug into the outlet contact an electrician to replace your obsolete outlet Do not defeat the safety purpose of thi...

Page 5: ...f producing very high sound pressure levels which may cause temporary or permanent hearing damage Use care when setting and adjusting volume levels during use Failure to comply with any of these safet...

Page 6: ...l as a more modern high gain tone depending on set up The ampli fi er features two channels Bright And Normal full tone stack master volume the ability to bridge channels a mid boost function and a ha...

Page 7: ...aracteristics of each channel contribute to the overall ampli fi er tone The instrument must be plugged into the normal channel jack in order for channel bridging to work 5 Bight Channel Volume This c...

Page 8: ...y and edge The amp must be in Standby mode before changing the position of this switch 18 Bias Adjust Control This control allows either the end user or a quali fi ed technician to set the idle curren...

Page 9: ...Out The Line Out jack supplies an unbalanced signal identical to what is being sent to the speakers Speakers must remain connected when using this jack 27 Foot Switch Jack Connect the supplied foot sw...

Page 10: ...A7 67100 4 x EL34 67100 JC 4x 6CA7 Replace only with a high quality matched sets of power tubes A re bias will be necessary when replacing power tubes Phase Inverter Replace with any high quality low...

Page 11: ...fi er panel switch must be engaged in order for the foot switch to work 2 Mid Selector Stomp the Mid foot switch to engage the ampli fi er s mid boost function When the mid boost function is engaged...

Page 12: ...es British invasion tone run the pre amp gains low and the master high For a more modern distortion tone run the pre amp gains high and the master low Tone Controls Start with the controls all at the...

Page 13: ...il you get the right amount of effect you want before using the presence You may fi nd that no presence is needed with certain edge control settings When turning up the presence concentrate on the eff...

Page 14: ...e Power Transformer Output Transformer And Choke These items are guaranteed for one year after date of purchase against manufacturer s defects If a failure occurs due a defect in manufacturing Old fi...

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