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2A61: Difference between revisions
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the maximum high-frequency cutoff is 300 kHz. | the maximum high-frequency cutoff is 300 kHz. | ||
The common mode rejection ratio is 50,000:1 at frequencies below 10 kHz. | The common mode rejection ratio is 50,000:1 at frequencies below 10 kHz. | ||
The input impedance at each input is 10 MΩ in parallel with 100 pF. The common mode range is +/- 5 V. | |||
The 2A61 has a line frequency filter that can be switched in our out of the signal path. | The 2A61 has a line frequency filter that can be switched in our out of the signal path. | ||
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and the parallel combination of V524 and V525 forms the other side. | and the parallel combination of V524 and V525 forms the other side. | ||
However, for purposes of thermal stability, V424 is thermally connected to V524 | However, for purposes of thermal stability, V424 is thermally connected to V524 | ||
and V425 is thermally connected to V525. The tail current in the 987-and-up version is about 16 mA and the nuvistors have a plate-to-cathode voltage of about 70V. | and V425 is thermally connected to V525. | ||
The tail current in the 987-and-up version is about 16 mA | |||
and the nuvistors have a plate-to-cathode voltage of about 70V. | |||
The second gain stage is a differential amplifier made of a pair of a pair of germanium PNP transistors. To implement the low-frequency cutoff, | The second gain stage is a differential amplifier made of a pair of a pair of germanium PNP transistors. | ||
To implement the low-frequency cutoff, | |||
the 2A61 has a large electrolytic capacitor, | the 2A61 has a large electrolytic capacitor, | ||
C437 (13,000 μF or 20,000 μF depending on serial number), | C437 (13,000 μF or 20,000 μF depending on serial number), | ||
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==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
Tek 2a61 front.jpg|Front | |||
Tek 2a61 left.jpg|Left | |||
Tek 2a61 right.jpg|Right | |||
Tek 2a61 top.jpg|Top | |||
Tek 2a61 bottom.jpg|Bottom | |||
Tek 2a61 1.jpg | |||
Tek 2a61 2.jpg | |||
Tek 2a61 3.jpg | |||
Tek 2a61 4.jpg | |||
Tek-2a61 early.png|Schematic (early version) | |||
Tek-2a61 late.png|Schematic (late version) | |||
</gallery> | </gallery> | ||
[[Category:560 series plugins]] | [[Category:560 series plugins]] | ||