Oldfield 6750 User Manual Download Page 4

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Important Safety Instructions 

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 For your safety read, retain, and follow all instructions. Heed all warnings. 

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 Only connect the power supply cord to an earth-grounded AC receptacle.  This amplifier is designed to 

operate on standard North American 115V AC and should only be plugged in to a receptacle meeting 
those specifications. 
  

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WARNING: 

To prevent damage, fire or shock hazard, do not expose this unit to rain or moisture. 

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 Unplug the power supply cord before cleaning the unit exterior (use a damp cloth only). Wait until the 

unit is completely dry before reconnecting it to power. 

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 Maintain at least 6 inches (15.25 cm) of unobstructed air space behind the unit to allow for proper 

ventilation and cooling of the unit. 

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 This product should be located away from heat sources such as radiators, heat registers, or other 

products that produce heat. 

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 This product may be equipped with a polarized plug (one blade wider than the other) or 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 this plug. 

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 Protect the power supply cord from being pinched or abraded. 

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 This product should only be used with a cart or stand that is recommended by the manufacturer. 

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 The power supply cord of this product should be unplugged from the outlet when left unused for a long 

period of time, or during electrical storms. 

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 This product should be serviced by qualified service personnel when: the power supply cord or the plug 

has been damaged; or objects have fallen, or liquid has been spilled onto the product; or the product has 
been exposed to rain; or the product does not appear to operate normally or exhibits a marked change 
in performance; or the product has been dropped, or the enclosure damaged. 

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 Do not drip or splash liquids, nor place liquid filled containers on the unit. 

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CAUTION: 

No user serviceable parts inside, refer servicing to qualified personnel only.  Do not expose 

the circuit of the amplifier under any circumstances. 

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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