Instruction/ maintenance manual of the product 1 Vista
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M M o o d d e e l l 1 1 E E x x p p e e r r i i m m e e n n t t e e r r ’ ’ s s S S E E A A u u d d i i o o A A m m p p l l i i f f i i e e r r U U s s e e r r ’ ’ s s M M a a n n u u a a l l 500-0001MR4 http://audio.
Dear Customer We at ENG Vista want to ta ke this opportunity to thank you for purchasing the Model 1 Experimenter’s SE Audio Amplifie r. The people that stand behind y our amplifier draw on more than a decade of professional electronics desi gn and manufacturing ex perience.
SAFETY PRECAUTIONS IMPORTANT SAFEGUARDS PLEASE READ CAREFULLY ALL THE FOLLOWING IMPORTANT SAFEGUARDS THAT ARE APPLICABLE TO YOUR EQUIPMENT SAFETY 1. Read the User’s Manual and refer to it frequently during your experimenting. 2. Retain the User’s Manual for future reference.
17. Unplug this product from the wall outlet befor e making any changes. Wait until tubes have cooled down. 18. When using replacement parts, be sure to use parts with sufficient voltage and power rating and adequate current carrying capability.
GETTING STARTED The Model 1 amplifier kit was designed to provide: 1. a universal tube amplifier suitable for every day listening to the music from your PC or portable music source, or as a guitar amplifier easy to overdrive; 2. a headphone amplifier; 3.
ASSEMBLING THE KIT If you purchased an unassembled kit, you will have all the parts, including tubes and printed circuit board. Parts are in marked bags, with referenc e numbers and value written on a bag. Reference numbers are the ones printed on t he PCB, so locating parts positions should be very easy.
CONNECTIONS NOTE: Before you turn the amplifier on, make sure the speaker connections are properly hooked up, or that headphone selector switch is in the headphone position. Never run the amplifier without speakers or headphones, since this may damage transformers.
8 Vf PHONES Vf4b R82 220k/0.5W 202-0001 Vf4a C132 10u/350V 100-0001 R252 27R/2W 206-0002 R51 1k 200-0003 J102 161-0001 1 2 3 4 R290 0R N/A R22 *1k* 200-0001 Vf3a R201 *1k* 200-0003 C111 **220u/35V** 1.
BOARD LAYOUT AND DIMENSIONS: The following Figure shows the component layout and dimensions of the board (in mils – 1mil=0.001inch), mounting holes and locations of tubes, potentiometers, switch and headphone connector, as well as locations of input jacks.
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CONFIGURATION JUMPERS – MODE OF OPERATION: The Model 1 has four groups of jumpers intended for setting a mode of operation – Pentode mode (P), Ultralinear mode (UL) and Triode mode (T). Ultralinear mode can only be used with output transformer that have additional terminal for UL operation.
CONFIGURATION JUMPERS – NEGATIVE FEEDBACK SELECTION: The Model 1 has optional negative feedback connecti on provided by jumper J161 (J162) – FBK. By moving the shorting block horizontally across the two lower pins, the negative feedback will be engaged.
CONNECTING POWER: As any other vacuum tube amplifier, Model 1 needs two voltages for proper operation: (1) Plate, or Anode voltage, Va and (2) Heater, or filament voltage Vf. Plate voltage should be brought to the terminal block J80 and filament voltage to J90.
CONNECTING OUTPUT TRANSFORMERS: For basic model, the output transformers should be designed to provide 5k Ω primary resistance. For the full pack, the primar y resistance should have 2.5k Ω rating. Rating of the secondary winding should correspond to the impedance of your speakers (4, 8 or 16 Ω , typically).
Again, for best stereo image, they should be connected in phase. The second harmonic distortion is common with single ended amplifiers (i t gives them specific, rich sound), and air transports sound with some degree of the second harmonic distortion too.
UPSIDE - DOWN ASSEMBLY The Model 1 printed circuit board (PCB) was designed with top to bottom symmetry. This symmetry enables building a tube amplifier with “tube audio look”, where tubes are mounted on top of the chassis.
FINAL WORDS Once again, thank you for your purchase. We hope that the Model 1 will give you hours and hours of fun and have you experience a multitude of diffe rent qualities of the “tube sound”.
PARTS LIST Parts with asterisks in the VALUE column are used in the Full-Pack assembly. Item Qty Reference EPN Value 1 2 R41, R42 N/U 2 14 R11, R12, R51, R52, R121, R122, R141, R142, R181, R182, R231, R232, R241, R242 200-0003 1k 3 8 R21, R22, R61, R62, R201, R202, R391, R392 200-0003 *1k* 4 2 R71, R72 202-0001 *220 k/0.
An important point after buying a device Vista 1 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Vista 1 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Vista 1 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Vista 1 you will learn all the available features of the product, as well as information on its operation. The information that you get Vista 1 will certainly help you make a decision on the purchase.
If you already are a holder of Vista 1, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Vista 1.
However, one of the most important roles played by the user manual is to help in solving problems with Vista 1. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Vista 1 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
