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The Tektronix 2A60 is | {{Plugin Sidebar 2 | | ||
before being renamed 2A60 at serial number 820. | title=Tektronix 2A60 | | ||
summary=1 MHz amplifier | | |||
image=Tek 2a60 front2.jpg | | |||
caption= 2A60 front view | | |||
introduced=1969 | | |||
discontinued=(?) | | |||
series=[[560-series scopes]] | | |||
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., | 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: | 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. | 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== | |||
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 | ||
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 |