STUM
Terms
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copy deck
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Essential Parts of an ATR
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Transport, Heads, Tape, Repro/Record Electronics
- Common maintenance performed:
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Cleaning, degaussing, alignment
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Order of alignment steps:
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Tape tension, head alignment, repro electrical, record electrical
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Alignment tools
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Test tape, spring scale, scope, VOM
- Method of record bias most commonly used today?
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AC bias
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The pre-emphasis and de-emphasis EQ curves compensate for these losses
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Record & Repro
- The effective gap length
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Is 10% larger than the physical gap length.
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Repro effective gap length is typically ______ the Record effective gap length
- Twice
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What causes HF loss on a magnetic tape?
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Gap length, overbias, poor storage
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Which of these operating levels shall exhibit a greater amount of self-erasure over time?
- 185 nW/m
- 320 nW/m
- 480 nW/m
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480 nW/m
- Megaphone & Wax Cylinder: When and Who?
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1877 Thomas Edison
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Gramophone
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1890 Emil Berliner
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Valve (tube) invented by who and when?
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DeForest 1907
- Who and when invented magnetic recording?
- Valdimar Poulsen 1898
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In 1909, Poulsen discovered what?
- That by adding DC bias, the s/n ratio improved.
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Who was the first developer of magnetic tape?
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Fritz Pflurr
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Who is credited with discoveing AC bias?
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Dr. Weber, in 1927
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Ampex introduced the first commericially available magnetic tape recorder in what year?
- 1947
- The five mechanical head alignments:
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- Height
- Zenith/Skew/Tilt
- Contact/Rack
- Wrap
- Azimuth
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What two types of changes occur during the magnetization process?
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- Changes in volume of some magnetic domains at the expense of others.
- Change in the direction of magnetism of the domain.
- Coercivity
- The force (current) needed to reduce the remnants of magnetism to zero.
- Retentivity
- The amount of magnetization or flux density remaining in the magnetic material after the magnetizing force has returned to zero.
- Sensitivity
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The highest output level tape can deliver before saturation. Expressed as relative sensitivity, relating to some reference, such as what is on a test tape.
- Where does recording take place?
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The trailing edge