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7A13: Difference between revisions
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===Repair issues=== | ===Repair issues=== | ||
The 7A13 uses twelve miniature relays similar to those used in the [[7A11]]. These are very rare. | The 7A13 uses twelve [[miniature relays]] similar to those used in the [[7A11]]. These are very rare. | ||
The [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_amplifier/amplifier_7A11.htm 7A11 repair report at amplifier.cd] | |||
describes a possible replacement with a modern component. See also the IK1ZYW link below. | |||
Early 7A13 plug-ins were made with a mechanical counter for reading out the comparison voltage. | Early 7A13 plug-ins were made with a mechanical counter for reading out the comparison voltage. | ||
The plastic gears in this counter don't age well. | The plastic gears in this counter don't age well. | ||
The plug-in can still be used when the counter fails, by using an | The plug-in can still be used when the counter fails, by using an | ||
external voltmeter to monitor the comparison voltage, | external voltmeter to monitor the comparison voltage, V<sub>c</sub>. | ||
Later 7A13 plug-ins use an LED readout instead of the mechanical counter. | Later 7A13 plug-ins use an LED readout instead of the mechanical counter. | ||
The LED readout is much less problematic. | The LED readout is much less problematic. | ||
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* [http://www.barrytech.com/tektronix/tek7000/tek7a13.html Tek 7A13 @ barrytech.com] | * [http://www.barrytech.com/tektronix/tek7000/tek7a13.html Tek 7A13 @ barrytech.com] | ||
* [http://www.radiomuseum.org/r/tektronix_differential_comparator_unit_7a13.html Tek 7A13 @ radiomuseum.org] | * [http://www.radiomuseum.org/r/tektronix_differential_comparator_unit_7a13.html Tek 7A13 @ radiomuseum.org] | ||
* [http://ik1zyw.blogspot. | * [http://ik1zyw.blogspot.com/2007/09/tektronix-7a13-broken-relays.html Tek 7A13 broken relays @ IK1ZYW Labs] | ||
* [http://www.pa4tim.nl/?p=5755 Repairing 7A13 relays @ PA4TIM] (how to take relays apart, inside photos) | * [http://www.pa4tim.nl/?p=5755 Repairing 7A13 relays @ PA4TIM] (how to take relays apart, inside photos) | ||
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<gallery> | <gallery> | ||
Tek 7a13 front.jpg | 7A13 older version, front view | |||
Tek-7a13-left.jpg | 7A13, left side | |||
Tek-7a13-right.jpg | 7A13, right side | |||
7a13-dials1.jpg | closeup of mechanical V<sub>C</sub> display in operation | |||
7a13-dials2.jpg | Three light bulbs above the digit dials for decimal point indication | |||
7a13-gears1.jpg | Gear mechanism | |||
7a13-gears2.jpg | Gear mechanism. If the leftmost display digit is misaligned with respect to the switch position, the left pair of bevel gears seen here need to be rotated relatively to each other. | |||
</gallery> | </gallery> | ||
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<gallery> | <gallery> | ||
7a13a-front.jpg | 7A13 newer version, front view | |||
7a13a-left.jpg | 7A13 newer version, left interior | |||
7a13a-right.jpg | 7A13 newer version, right interior (some non-original relays) | |||
</gallery> | </gallery> | ||
[[Category:7000 series vertical plugins]] | [[Category:7000 series vertical plugins]] | ||