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are used as a ramp-compare ADC. Card Q (Voltmeter) contains a 1MHz crystal oscillator. | are used as a ramp-compare ADC. Card Q (Voltmeter) contains a 1MHz crystal oscillator. | ||
The counters (Card A) are made of flip-flops made of 2N1754 Germanium PNP transistors. | The counters (Card A) are made of flip-flops made of 2N1754 Germanium PNP transistors. | ||
The 6R1A differs sightly from the 6R1. | |||
One difference is the how the 0% zone is determined. | |||
In the 6R1, the 0% zone is always the leftmost major division of the | |||
trace. The 6R1A allows the 0% zone to be set arbitrarily. | |||
When a 6R1 is used in a 567 with a [[3T77]], the horizontal sweep signal is | |||
generated by the staircase generator circuit in the 3T77 and from R184 in the | |||
staircase generator, the sweep signal is sent to the horizontal amplifier circuit | |||
of the 3T77, where it enters the sweep mode switch. Assuming that the sweep mode | |||
switch is in the NORMAL or SINGLE DISPLAY positions, the sweep signal is sent out | |||
through R318 to pin 20 on P22, the connector on the rear of the 3T77. The 567 carries | |||
the signal to pin 8 on P32 of the 6R1. Within the 6R1, the sweep signal is carried | |||
to pin 7 of the 0% zone card. On the 0% zone card, the sweep signal is buffered by | |||
V43, a Nuvistor cathode-follower, and the buffered sweep signal is sent out from | |||
pin 10 of the 0% zone card. On the 0% zone card, the sweep voltage is compared with | |||
a fixed voltage, putting D43, a 2mA tunnel diode, into the high voltage state whenever | |||
the sweep signal is above about 5 V. The sweep signal goes from 0 V to 50 V for a | |||
complete sweep, so 5V corresponds to point 1 major division from the left edge of the display. | |||
[http://w140.com/tek_6r1_schem.pdf 6R1 Schematics] | [http://w140.com/tek_6r1_schem.pdf 6R1 Schematics] |