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Summary of Contents for Oldfield 6750
- Page 1 Oldfield Amplifiers User Guide 6750 6750-JC 67100 67100-JC...
- Page 2 Thank You Welcome to the Oldfield family and thank you for putting your trust in Oldfield Amplifiers. We value that trust as much as we feel confident you will enjoy your new Oldfield amplifier. Your new Oldfield amplifier is built to provide you with the best tonal experience and durability available in a guitar amplifier.
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Page 3: Table Of Contents
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: Important Safety Instructions 4~5
Important Safety Instructions Δ For your safety read, retain, and follow all instructions. Heed all warnings. Δ 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. - Page 5 Δ CAUTION: By nature vacuum tubes get very hot during operation. Do not touch vacuum tubes until they have sufficiently cooled. Δ Oldfield amplifiers are capable of producing very high sound pressure levels which may cause temporary or permanent hearing damage. Use care when setting and adjusting volume levels during use.
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Page 6: Overview
Preamp: 3 x 12AX7 Phase Inverter: 12AX7 (LTP) Power: 6750 - 2 x EL34, 67100 - 4 x EL34, 6750-JC - 2 x 6CA7, 67100-JC - 4 x 6CA7 Bias: Fixed Rectifier: Solid State on 100 watt models and GZ34 / Solid State selectable on the 50 watt amplifiers. -
Page 7: Panel Controls And Features
Controls And Features 1 - Amplifier Input - Bright Channel: Connect 5 - Bight Channel Volume: This control your instrument with a high quality instrument determines the overall volume of the Bright cable to the Bright jack to use the Bright channel. - Page 8 12 - Presence: The presence control adds capable of reducing output using the Half high frequencies to the guitar tone. Rotating Power switch. On the 6750 and the 6750-JC the control clockwise increases the tone’s high this is accomplished by running the power frequencies.
- Page 9 Controls And Features (Continued) 26 - Line 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 switch to this jack with a 5 pin midi cable.
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Page 10: Tube Layout
6750 and 6750-JC. Power Tubes: 6750 - 2 x EL34, 6750-JC 2 x 6CA7, 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. -
Page 11: Foot Switch Controller
Foot Switch Controller 1. Bridge Selector: Stomp the Bridge foot switch to engage the channel bridge function. When the bridge function is engaged the indicator light is turned on. The amplifier panel switch must be engaged in order for the foot switch to work. 2. -
Page 12: Operation Notes
Operation Tips Using the Master Volume Control - The master volume control determines the overall volume of the amplifier. That part may seem obvious. The master volume also controls other, more subtle aspects of your amplifier’s tone. As you turn the master volume up the tone will become sonically fuller with more pronounced high and low frequencies. - Page 13 Operation Tips - Continued concentrating on the edge first. Turn that control up until you get the right amount of effect you want before using the presence. You may find that no presence is needed with certain edge control settings. When turning up the presence concentrate on the effect it has with both high frequencies and low frequencies to get the tone you desire.
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Page 14: Warranty
Warranty The following warranties apply to the original owner of the amplifier. All warranty work must be performed by Oldfield or an authorized technician for the warranty to be in effect. Warranties do not cover normal wear and tear or abuse. Failure to comply with the safety precautions outlined earlier in the owner’s manual will void all warranties.
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