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Summary of Contents for almarro A318B
- Page 1 OPERATIONAL MANUAL A318B SET Integrated Amplifier almarro 3489-24 Kitagata. Iida-shi, Nagano 395-0151, Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com...
- Page 2 Operational Manual Please, take the time to read through the entire manual before operating the amplifier. At Almarro we believe that each of our products has its own personality – it is a signature of its unique sound. However to fully enjoy the remarkable and captivating sound of this amplifier you have to understand the product.
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Page 3: Table Of Contents
Important Safety Instructions (Read me First!) Technical Summary and Features Amplifier (Front View) Amplifier (Rare View) Specification Installation and Operating the Amplifier Maintenance Guide xxviii Warranty xxxix 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com... -
Page 4: A Little Bit Of History
“going back to the future” by reinventing people are finding out about and attest to. technology and returning to it’s original roots! Each Almarro product is fully tested to ensure that it is the best it can be. 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan... -
Page 5: Important Safety Instructions (Read Me First!)
Keep children and pets away from the unit. In case of the unlikely event when the amplifier needs service have the amplifier serviced by qualified personnel approved by Almarro Products service centers. 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com... - Page 6 Keep the amplifier away from direct Sun light. Always use a correctly grounded power outlet to ground the chassis of the amplifier. Do not modify the amplifier. 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com...
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Page 7: Technical Summary And Features
Operational Manual Technical Summary and Features The A318B amplifier utilizes a one 6SL7 ( 6H9C) Single -Ended Class A. tube on the input, one 6SN7 (6H8C) dual triode as second-stage anode- follower, driving one pair of The Almarro A318B is an integrated single- 6C33C output tubes. - Page 8 Power (Output) Tubes Because of its sonic characteristics and low internal resistance this tube was the best choice for The most interesting aspects of the A318B are the A318B amplifier. Russian 6C33 output tubes. A version of these rugged power triodes was applied in MIG-25 fighter aircraft.
- Page 9 The graph shows the output characteristics of 6C33C. The 6C33C has a high current capability and low internal impedance. This characteristics of the 6C33C helps to improve bass performance. 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com...
- Page 10 Optimum bias provides the best balance of tube life The sound quality of the tube is the best indicator and sound quality of tube performance. The 6C33C-B output Tubes in the A318B amplifier require manual bias setting (Refer to the Bias Adjustment Procedure in this manual)
- Page 11 The Feedback was traditionally used to lower distortion Almarro A318B transformer has output taps at 4, 8 of an amplifier. To overcome interaction from the ohms allowing it to match to a wide variety of loudspeaker that causes distortion and impacts the speakers.
- Page 12 M33A) will sound best on the 8 Ohm taps. speakers have impedances as 6 or even 5 Ohms. Fig. 1 The diagram illustrates schematics of the A318B amplifier (Only Right channel is shown) 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com...
- Page 13 Build The amplifier is finished on all sides in solid wood. The 318B amplifier is hand-made in Japan Almarro amplifiers are laid out logically with an from start to finish by experienced economical signal flow. This kind of construction professionals who adhere to critical have the advantages of being easy to repair, because considerations—such as keeping signal wires...
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Page 14: Amplifier (Front View)
Amplifier (Front View) Fig. 2 6C33C-B Output (Power) Tube Power Switch Volume Control Input Select 6SL7 (6H9C) input tube 6C33C-B Output (Power) Tube 6SN7 (6H8C) second-stage (cathode follower) tube 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com... -
Page 15: Amplifier (Rare View)
Fig. 3 Output Transformer Power supply choke Left Speaker Terminals 8 Ohm-0-4 Ohm Output Transformer Fuse Right Speaker Terminals 8 Ohm-0-4 Ohm Power Socket Input RCA Connectors 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com... -
Page 16: Specification
Less then 5.4 dB Hum Level (mV AC) 0.5mV at minimum volume 1.2mV at half volume Power consumption: 240w Dimensions: W37cm x D28cm x H20cm Weight: 18.0 kg 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com... - Page 17 Operational Manual Important Recommendations for the System Setup Like any other high quality amplifier the A318B amplifier is designed to produce superior sonic characteristics when used in the appropriate The standard Hi-Fi audio system consists of a few acoustic conditions. The acoustical conditions...
- Page 18 All Almarro speakers provide an excellent impedance match with the A318B SET amplifier. We always recommend working with our authorized dealers and determine the right speakers for you during listening sessions (tests).
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Page 19: Installation And Operating The Amplifier
Page xiv-xxv Bias Adjustment (Maintenance) Page xxx-xxxiv Playing Music Page xxvi Break In Page xxvi 6C33C-B tube requires manual bias setting. (See the Procedure in this Manual) 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com... -
Page 20: Install The Tubes Page
(Pages xx- xxiii). If you find damages or problem, please call Almarro distributor and keep everything as it is. Distributor will claim insurance and investigator may visit you. Before shipping, the tubes are given a full operational check and are quality tested. - Page 21 Fig. 4 Power Supply Chock Output Transformer Power Transformer 6C33C-B 6C33C-B 6SN7 6SL7 (6H8C) (6H9C) 6C33C Bias Trims A318B SET INTEGRATED AMPLIFIER LAY OUT 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com...
- Page 22 Verify that the tubes are fully inserted in the socket and that they are in a vertical position. Bakelite base xxii 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com...
- Page 23 If a tube appears to be dislocated, press down gently using a glove or clean cloth. The picture shows the base plate socket of the 6C33C-B tube. xxiii 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com...
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Page 24: Connect Speakers
Placement of the Amplifier Using the RCA interconnects connect output terminals of the sources to the RCA inputs on the A318B amplifier is an open tube design. The rare panel of the amplifier. amplifier should be placed on a flat and firm... - Page 25 Volume Control Switch TIPS: Rotate the VOLUME Control clockwise to increase Keep the input selector switch at the Mute the volume. position and turn on the power switch. 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com...
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Page 26: Playing Music
Due to capacitors break-in the amplifier will sound bring the amplifier to its best performance. better after a certain period of usage. The break-in period for the A318B is about 100 hours when the amplifier is first used. During this period the sound quality will improve. -
Page 27: Connecting The Amplifier
Operational Manual Fig. 5 Connecting the Amplifier Diagram 4/8 Ohm Speaker 4/8 Ohm Speaker CD-Player Turntable Phono Stage xxvii 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com... -
Page 28: Maintenance Guide
Operational Manual Maintenance Guide The Almarro A318B amplifier is designed to keep maintenance to a minimum. In some cases, however the owner can perform simple maintenance. 6C33C-B tube requires manual bias setting. We recommend checking and adjusting the bias voltage after the first 30 minute of operation every time when using the amplifier. (Read Output tubes Bias Adjustment Procedure carefully). -
Page 29: Bias Adjustment
Please do not touch it under any circumstances. The high voltages inside the amplifier chassis can be LETHAL xxix 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com... - Page 30 Rev 1.0 April, 2008 WHY DO WE NEED TO ADJUST BIAS? The 6C33C-B tube employed in the A318B amplifier requires manual bias adjustment due to its electrical characteristics and stability. Each of the 6C33C-B tubes has individual trimmers that are used to adjust each output tube's bias voltage.
- Page 31 The Multi-meter comes with some basic instructions. Read them first. If your multimeter is digital, it will require a small battery to operate. If it is analog, it does not need a battery to measure voltage. xxxi 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com...
- Page 32 Set the meter to read 'millivolts' DC or use the 2 Volt scale. The voltages you are looking at are 0.18V. Each 6C33C-B tube has two bias adjustment points under its ceramic plates (“ + “ and “-“ in picture below). xxxii 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com...
- Page 33 Don't go overboard when pressing the probes against terminals Turn on the A318B. Warm up the amplifier for 30 minutes. (Remember that the A318B amplifier employs a relay- controlled timer to allow the tubes time to warm up and stabilize. This will start the amplifier’s 2...
- Page 34 These adjustment dials are located on the front panel of the amplifier. The picture below shows two dials hidden inside the small holes. xxxiv 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com...
- Page 35 You should never force-turn one of these trimmers. Front View (Facing to the Amplifier) Left Tube (Bias Adjustment Dial) Trimmer Right Tube (Bias Adjustment dial) Trimmer xxxv 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com...
- Page 36 We recommend keeping bias voltage at 0.18DCV. This way the amplifier will produce enough power and tube life will be extended. DISCLAIMER: ALMARRO PRODUCTS WILL TAKE NO RESPONSIBILITY FOR ANY INJURIES OR DAMAGE SUFFERED BY ANYONE AS A RESULT OF THE MISINTERPRETATION OR MISAPPLICATION OF THE INFORMATION CONTAINED IN THIS PROCEDURE. PROPER HIGH-VOLTAGE SAFETY PROCEDURES AND PRECAUTIONS MUST BE FOLLOWED AT ALL TIMES WHEN SERVICING VACUUM TUBE AMPLIFIERS.
- Page 37 Operational Manual xxxvii 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com...
- Page 38 Operational Manual xxxviii 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com...
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Page 39: Warranty
All returns to the factory must be in the original packing, (new packing will be supplied for no charge if needed), accompanied by a written description of the defect, and must be shipped to Almarro Products via insured freight at the customer's own expense. Charges for unauthorized service and transportation costs are not reimbursable under this warranty. - Page 40 Operational Manual 3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com...
- Page 41 RCA RC-30 Receiving Tube Manual, 1970 “All about Wiring”, Web Article (Guitar Amplifier) By Dave Hunter, February, 2008 6 Moons Audio Review. “Almarro A318B, June, 2007, Srajan Ebaen” Disclaimer: This manual is not intended for sale or any type of commercial distribution or reproduction.
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