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[[File:181_PC_ISO.jpg|thumb|350px|right|181, early version]] | |||
The '''Tektronix Type 181''' is a time mark generator [[introduced in 1955]]. There is a benchtop version, | The '''Tektronix Type 181''' is a time mark generator [[introduced in 1955]]. There is a benchtop version, | ||
the 181, and a rackmount version, the RM181. MOD 110 substitutes a oven-stabilized | the 181, and a rackmount version, the RM181. MOD 110 substitutes a oven-stabilized | ||
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A 181 with the OCXO mod is a "181 S1". | A 181 with the OCXO mod is a "181 S1". | ||
==Manuals == | |||
* [[Media:070-292.pdf|Tektronix 181 Manual (sn 6917, color schematics, PDF)]] | |||
* [http://w140.com/mmm/tek-181.pdf Tektronix 181 Manual (PDF)] | |||
==Internals == | |||
Internally, the 181 is similar to the [[180A|180]]. | Internally, the 181 is similar to the [[180A|180]]. | ||
The oscillator drives a chain of synchronized monostable multivibrators. | The oscillator drives a chain of synchronized monostable multivibrators. | ||
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the reference oscillator. | the reference oscillator. | ||
The power supply of the 181 produces +300 V and | The power supply of the 181 produces +300 V and −150 V regulated voltages and | ||
+400 V, | +400 V, −8 V, and −25 V unregulated. The voltage reference is a [[5651]] tube. | ||
The output tubes for both regulators are [[12B4]] and the feedback amplifier | The output tubes for both regulators are [[12B4]] and the feedback amplifier | ||
tubes are [[6AU6]]. The 181 does not contain a fan or a [[thermal cutoff]]. | tubes are [[6AU6]]. The 181 does not contain a fan or a [[thermal cutoff]]. | ||
==Pictures == | |||
<gallery> | <gallery> | ||
Tek 181.jpg|181 | |||
Tek rm181.jpg|RM181 | |||
181_PC_ISO.jpg|181, early version | |||
181_PC_Front.jpg|181, early version, front | |||
181_PC_Left.jpg|181, early version, left side | |||
181_PC_Right.jpg|181, early version, right side | |||
Tek co181.jpg|CO181 oven-stabilized oscillator | |||
Tek 181 block.png|Block diagram | |||
Tek 181 oscillator and multiplier.png|oscillator and multiplier | |||
Tek 181 frequency dividers.png|frequency dividers | |||
Tek 181-switching detail.png|switching detail | |||
Tek 181 power supply.png|power supply | |||
Tek rm181 1us output2.jpg|Output waveform of RM181 set for 1 us period | |||
Tek 181 later style rounded case.jpg|Later style case, rounded corners | |||
Tek 181 left internal on.jpg|Left internal view, powered up | |||
Tek 181 late internal.jpg|Internal view, late version | |||
</gallery> | </gallery> | ||
[[Category: | [[Category:Time mark generators]] | ||
[[Category:Introduced in 1955]] | [[Category:Introduced in 1955]] | ||