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2A60: Difference between revisions
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The Tektronix 2A60 is | {{Plugin Sidebar | ||
before being renamed 2A60 at serial number 820. | |manufacturer=Tektronix | ||
compensated attenuator and | |series=560-series scopes | ||
pentodes. The differential signal is then applied to a cathode-follower stage which drives the output stage. | |type=2A60 | ||
|summary=1 MHz amplifier plug-in | |||
|image=Tek 2a60 front.jpeg | |||
|caption=2A60 front view | |||
|introduced=1962 | |||
|discontinued=(?) | |||
|manuals= | |||
* [[Media:070-263.pdf|Tektronix 2A60 Manual]] | |||
* [[Media:Tek type 60 irb.pdf|Tektronix Type 60/2A60 Instrument Reference Book]] (OCR) | |||
}} | |||
The '''Tektronix 2A60''' is a 1 MHz, single-channel amplifier plug-in for [[560-series scopes]]. | |||
It was designated "Type 60" before being renamed 2A60 at serial number 820. | |||
The V/div positions of the 2A60 are somewhat unusual among Tektronix plug-ins. | |||
Most plug-ins use the 1−2−5 scale factors, e.g., 10 mV/div, 20 mV/div, 50 mV/div, 100 mV/div, etc. | |||
The 2A60's V/div positions are multiples of ten: 50 mV/div, 500 mV/div, 5 V/div, 50 V/div. | |||
This unusual feature was presumably a cost-cutting measure. | |||
The 2A60 was the one of the least expensive amplifier plug-ins for [[560-series scopes]]. | |||
(The [[59|Type 59]] was even cheaper, at half the price of the 2A60.) | |||
The 2A60 is similar to the [[3A75]], but the 3A75 has the standard 1−2−5 V/div positions and 4 MHz bandwidth. | |||
The linearization trick of diodes bypassing the cathode resistor (discussed below) is also used in the 3A75. | |||
In the [[Tek_Catalogs|1963 Tektronix catalog]], both models were listed. The 3A75 was 1.7× the cost of the 2A60. | |||
{{BeginSpecs}} | |||
{{Spec | Bandwidth | 1 MHz }} | |||
{{Spec | Rise time | 350 ns }} | |||
{{Spec | Deflection | 50 mV, 500 mV, 5 V or 50 V per division, plus variable adjustment }} | |||
{{EndSpecs}} | |||
==Links== | |||
{{Documents|Link=2A60}} | |||
==Internals== | |||
The input signal passes through a compensated attenuator and then into the input amplifier, a differential amplifier formed from two [[6AU6]] pentodes. | |||
The differential signal is then applied to a cathode-follower stage which drives the output stage. | |||
The output stage is a differential amplifier formed from both halves of a [[6DJ8]] dual-triode. | The output stage is a differential amplifier formed from both halves of a [[6DJ8]] dual-triode. | ||
To help linearize the output stage when it is making large positive or negative excursions, | To help linearize the output stage when it is making large positive or negative excursions, | ||
a pair of germanium diodes is placed in parallel with the resistor that connects the cathodes of output triodes. | a pair of germanium diodes is placed in parallel with the resistor that connects the cathodes of output triodes. | ||
The effect is that when the signal swings far in either direction, the gain degeneration (negative feedback) | The effect is that when the signal swings far in either direction, the gain degeneration (negative feedback) is reduced. | ||
is reduced. This helps keep gain stable across the range of signal voltages. | This helps keep gain stable across the range of signal voltages. | ||
==Pictures== | |||
<gallery> | <gallery> | ||
Tek 2a60 front.jpeg | |||
Tek 2a60 front4.jpg | |||
Tek 2a60 front.jpg | |||
Tek 2a60 1.JPG | |||
Tek 2a60 2.JPG | |||
Tek 2a60 3.JPG | |||
Tek 2a60 early.png|Schematic (early) | |||
Tek 2a60 late.png|Schematic (late) | |||
Tek 2a60 right.jpg | |||
Tek 2a60 left.jpg | |||
Tek 2a60 diodes.jpg|diodes for linearization | |||
</gallery> | </gallery> | ||
==Components== | |||
{{Parts|2A60}} | |||
[[Category:560 series plugins]] | |||