ModWright Instruments Ambrose A30 Manual de usuario

Ambrose A30

Tube Mono Block Amplifiers

Owner’s Manual

Manufactured by ModWright Instruments, Inc.

21919 399th St., Amboy, WA 98601

USA

www.modwright.com

PLEASE READ FIRST:

General amplifier operation:

Safe Operation:

oBefore turning the amplifiers on, be sure that speaker cables are connected to the

amp and to the speakers. The output transformers expect a load (speaker). If the

amps are turned on without a load, the amps could be damaged.

Startup:

oTo power unit up, simply depress the black button on the front top face of the

amp. When you do this, the unit will turn on and the MWI logo in the face will

light up with an incandescent glow and the tubes will warm and light up also.

oIf unit does not power up at this point, check to be sure that power plug is firmly

seated and power cord is connected to mains voltage indicated on back panel of

amplifier. US/Canada 120V, HK 220V, Europe and other countries 220V-240V.

oIf the unit still does not power up, check the fuse on the rear of the amp. It is

rated for 4A slow-blow (120V), 2A slow-blow (240V).

Fuses:

oThere is one fuse per amp, installed in an external, serviceable fuse block. We do

not recommend changing the stock fuse or stock fuse value. Doing so will void the

factory warranty.

General Operation:

Note: It is always recommended that you power the amplifier on last, when powering

up your audio system. When powering your audio system down, it is always

recommended to power the amplifier off first.

Operation:

oConnect the Left RCA cable from the preamp to the amplifier serving the Left

speaker and the Right RCA cable from preamp to the amplifier serving the Right

speaker.

oConnect (+) and (-) Left and (+) and (-) Right speaker cables from binding posts

on back of Left and Right amplifiers to Left and Right speakers.

Tube Bias:

oTube bias if fixed and requires no adjustment. When replacing power tubes, tubes

should be replaced as a matched septet (6), or in matched sets of three per amp.

Specifications:

Power Ratings:

o32W @ 6 ohms (Stereo) @ .1% THD.

Technical Specification:

oBandwidth: 20Hz - 20Khz

oGain: 22dB

oInput Impedance: 100K

Weight and Dimensions:

oDimensions: 9"W x 17"D x 10"H

oShipped Weight: 55lb (47lb net weight)

Tube Complement:

oInput: (1)12AT7 tube per mono block amplifier.

oPower: (3) EL34 tubes (matched set) per mono block amplifier.

Care and Cleaning:

Wood Finish:

oThe Wood portion of the enclosure is hand crafted, oiled and polished to the

highest standard. Absolutely no detergent, cleaner or wax should be used to clean

the wood surface. Only use pure lemon oil, such as Formby’s, applied in small

amounts with a soft cloth. For regular cleaning, simple buffing of the wood finish

with a dry soft cloth will suffice.

Caution: Avoid contact of lemon oil with metal.

Transformer Cover Painted Metal Finish:

oA high quality, prismatic powder coat finish is used to ‘paint’ the transformer

covers. The finish scratches easily and as a result, we polish it prior to shipping

with a protecting coating of wax. To clean, simply wipe gently with a clean, soft

cloth. You may also apply ‘Nu Finish’ to further protect the finish. This is what

is used at the factory prior to shipping.

Anodized Aluminum Top and Bottom Plate Finish:

oThese surfaces are bead blasted, anodized billet aluminum. To clean, simply wipe

with a cloth, damp with a cleaner such as Windex. Take care to only clean the

Aluminum finish this way. Do no spray cleaner directly on the aluminum.

Thank you for purchasing a ModWright Ambrose amplifier. Each

piece is handcrafted in the U.S.A. with heirloom quality materials and

craftsmanship.

WARRANTY:

ModWright agrees to warranty product for a period of 5 years from date of purchase from

a factory authorized ModWright Instruments Dealer.

Warranty covers parts and labor for repairs due to equipment failure not related to

customer abuse and/or neglect. Customer is responsible for shipping costs to and from

ModWright Instruments or authorized service center.

There are no user-serviceable parts inside the amplifier and evidence that someone other

than a ModWright Instruments Factory Authorized service professional has opened the

product enclosure or in any way tampered with the internal workings of the unit,

including replacement of stock fuses, will void factory warranty.

Warranty is non-transferable to second party.

Contact Information:

If you have any questions about ModWright Instruments products or ModWright

modifications or products, please do not hesitate to contact us via phone, e-mail or

conventional mail.

PH: 360-247-6688

EMAIL: [email protected]

ADDRESS:

ModWright Instruments, Inc.

21919 NE 399th St.

Amboy, WA 98601

United States of America

Thank you for purchasing a ModWright Instruments product.

Dan Wright,

President, Owner

ModWright Instruments, Inc.

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