one step ahead a brand of ENG Vista, Inc. m o d el i 3 4 Integrated Tube Amplifier User’s Manual http://www.vista-audio.com/ 1 Rev.
Dear Customer We at ENG Vista want to take this opportunity to thank you for purchasing the model i34 Integrated Tube Amplifier. The people that stand behind your amplifier draw on more than a decade of professional electronics design and manufacturing experience. We are committed to providing our customers with the high quality sound at affordable prices. We have achieved this goal through modern design, quality parts, expert components sourcing and efficient manufacturing.
SAFETY PRECAUTIONS IMPORTANT SAFEGUARDS PLEASE READ CAREFULLY ALL THE FOLLOWING IMPORTANT SAFEGUARDS THAT ARE APPLICABLE TO YOUR EQUIPMENT CAUTION! TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE SCREWS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. SAFETY 1) Read the User’s Manual and refer to it frequently during use of this product - All the safety and operating instructions should be read before the product is operated.
ENVIRONMENT 1) Water and Moisture - Do not use this product near water - i.e. near a bathtub, ash bowl, kitchen sink or laundry tub; in a wet basement; or near a swimming pool or the like. Damp basements should be avoided. 2) Heat - The product should be situated away from heat sources such as radiators, heat registers, stoves or other appliances that produce heat. Also avoid putting the unit in the direct rays of the sun. 3) For indoor use only.
Getting Started - About Your Amplifier Your model i34 amplifier was designed to provide a significant value based on a high performance to price ratio that will exceed the sonic quality of good solid state amplifiers with its musical accuracy. The model i34 uses 2 sets of matched pairs or one matched quad (total of 4) of E34L power output tubes and two ECC832 preamp tubes. The model i34 is designed to work in class AB and deliver up to 35W of clean power.
E34L V1 E34L E34L E34L ECC832 V4 ECC832 V2 V3 V6 V5 model i34 Figure 1: model i34 tube layout Never use excessive force when inserting the tubes into their socket. Controls and Their Functions Front Panel Selector Switch – The three position selector switch can be used to select the active audio source. Volume control - This control is used to adjust the output volume level. Turning the control knob clockwise increases the sound level and turning it counterclockwise decreases the sound level.
Operating Procedure 1. Make sure that you read instructions before attempting to operate your unit. 2. Attach the audio sources and speakers (refer to the picture below). Never run the amplifier without speakers connected since that may damage the transformers. Speaker’s minus terminal should be connected to the speaker terminal marked as zero (0) and positive terminal should be connected to the terminal that corresponds to the speaker’s nominal impedance (4 or 8 ohms).
Only matched pairs of output tubes should be used for each channel. Before you start replacement you should make certain that the unit is turned off and disconnected from the AC outlet and that the tubes have cooled down. Allow sufficient time, minimum 30 minutes, for tubes to cool down and internal capacitors to discharge. Before inserting a new tube, inspect the tube for cracks and physical damage. Make sure that the pins are straight.
3. Even though you are using matched tubes, they are likely to have somewhat different bias voltages. By rotating bias control adjust bias on the tube with higher reading. The bias should be adjusted to approximately 350mV (0.35V), any value between 340 and 360mV (0.34 to 0.36V) is acceptable. For actual bias current divide measured voltage by 10 to get current in mA (350mV=35mA). Check the bias reading on the other tube and it may not be identical, but should not be lower than 290mV (0.29V).
Technical Specifications: Integrated tube amplifier Maximum output power: 35W Class of operation: AB THD: 0.3% max (1W/1kHz) Bandwidth: 15Hz-35kHz Input sensitivity: 0.
LIMITED WARRANTY 1. Chassis and transformers: 2 years plus 10 days (from the date of shipment) 2. Electron tubes: 6 months plus 10 days (from the date of shipment) Who is covered by this warranty? Your Vista-Audio warranty protects the original consumer owner of this Vista-Audio product. What is covered? Except as specified below, this warranty covers all defects in material and workmanship in this product occurring during the above warranty periods.