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The Tektronix 2A60 is an single-channel amplifier plug-in for 560-series scopes.  It was designated the "Type 60"
{{Plugin Sidebar 2 |
before being renamed 2A60 at serial number 820. It has a bandwidth of 1MHz.  The input signal passes through a
title=Tektronix 2A60 |
compensated attenuator and the into the input amplifier, differential amplifier formed from two [[6AU6]]
summary=1 MHz amplifier |
pentodes.  The differential signal is then applied to a cathode-follower stage which drives the output stage.
image=Tek 2a60 front2.jpg |
The output stage is a differential amplifier formed from both halves of a [[6DJ8]] dual-triode.
caption= 2A60 front view |
To help linearize the output stage when it is making large positive or negative excursions,
introduced=1969 |
a pair of germanium diodes is placed in parallel with the resistor that connects the cathodes of output triodes.
discontinued=(?) |
The effect is that when the signal swings far in either direction, the gain degeneration (negative feedback)
series=[[560-series scopes]] |
is reduced.  This helps keep gain stable across the range of signal voltages.
manuals=
* [http://w140.com/tek_2a60.pdf Tektronix 2A60 Manual (PDF)]
}}
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.  
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., 10mV/div, 20mV/div, 50mV/div, 100mv/div, etc.
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: 50mV/div, 500mV/div, 5V/div, 50mV/div.
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.
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 2A60 was the one of the least expensive amplifier plug-ins for [[560-series scopes]].
(The [[59|Type 59]] was half the price of the 2A60.)
(The [[59|Type 59]] was even cheaper, at half the price of the 2A60.)


The 2A60 is similar to the [[3A75]],  
The 2A60 is similar to the [[3A75]], but the 3A75 has the standard 1-2-5 V/div positions and 4 MHz bandwidth.
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 above) is also used in the 3A75.
The linearization trick of diodes bypassing the cathode resistor (discussed above) is also used in the 3A75.
In the [[Tek_Catalogs|1963 Tektronix catalog]], both models were listed.  
In the [[Tek_Catalogs|1963 Tektronix catalog]], both models were listed.  
The 3A75 was 1.7x the cost of the 2A60.
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}}
 
==Internals==


* [http://w140.com/tek_2a60.pdf Tektronix 2A60 Manual (PDF)]
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.
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.
The effect is that when the signal swings far in either direction, the gain degeneration (negative feedback)
is reduced.  This helps keep gain stable across the range of signal voltages.
 
==Pictures==


<gallery>
<gallery>
File:Tek 2a60 front2.jpg
File:Tek 2a60 front2.jpg
Image:Tek 2a60 front.jpg
File:Tek 2a60 front.jpg
File:Tek 2a60 1.JPG
File:Tek 2a60 1.JPG
File:Tek 2a60 2.JPG
File:Tek 2a60 2.JPG
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/20012"

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