Oldfield Amplifiers Marquis Thirty Owner'S Manual Download Page 10

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Page: 10

Tube Layout

This is the view from the rear of amplifier.

Tube Notes:

Please refer to the warnings section before handling tubes.

Biasing:

This amplifier is cathode biased. Replacing power tubes will not require a rebias-

ing of the amplifier. Replace power tubes only with a matched quad to achieve optimal

tone from the amplifier and avoid power tube issues.

EF86

Pentode

Triode

EL84

12A

12AX7

EF86

5R4

Summary of Contents for Marquis Thirty

Page 1: ...Page 1 Marquis Thirty Owners Guide OldfieldMarquisThirty Marquis30 Pentode Triode Top Cut 1 2 Volume 1 Volume 2...

Page 2: ...fier is built to provide you with the best tonal experience and dura bility available in a guitar amplifier As with all Oldfields It is hand built with you the player as the central focus of our effor...

Page 3: ...Page 3 Table Of Contents Important Safety Instructions 4 thru 5 Overview 6 Front Panel Controls And Features 7 thru 8 Rear Panel Controls And Features 9 Tube Layout 10 Warranty 11...

Page 4: ...oduct 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 elect...

Page 5: ...uum tubes until they have sufficiently cooled Oldfield amplifiers are capable of producing very high sound pressure levels which may cause temporary or permanent hearing damage Use care when setting a...

Page 6: ...ranked tone at higher volumes The amp is extremely responsive to your attack and guitar volume Your amp is built to last a lifetime and will give you countless hours of enjoyment whether on stage in t...

Page 7: ...ertones will mix with the tone as well Note Channel 1 and Channel 2 are out of phase with each other and can not be jumper d as a player might do with some other 4 input amplifiers 5 Treble This contr...

Page 8: ...nnel 1 and use the Top Cut control to dial in the tone for that channel The player then has the 3 tone controls available for adjusting the tone of channel 2 while leaving the Top Cut control unchange...

Page 9: ...r Jack An external speaker can be connected to this jack Note A speaker must be connected to one of the speaker jacks at all times Failure to do so will result in serious damage to the unit The combin...

Page 10: ...efore handling tubes Biasing This amplifier is cathode biased Replacing power tubes will not require a rebias ing of the amplifier Replace power tubes only with a matched quad to achieve optimal tone...

Page 11: ...ansformer Output Transformer Reverb Transformer And Choke These items are guaranteed for ten years after date of purchase against manufacturer s defects If a failure occurs due a defect in manufacturi...