another doubt from the trenches
1. the 12ba4 datasheet notes that pin 4,5 are heater pins and pin 3 is the heater center tap. do i omit pin 3 or do i use pin 4,5 as a floating heater circuit and ground to Power supply ground (center tap on high voltage power supply)?
2. pins 2,7 are both grid pins. do i tie them together or just use one of them
thanks in advance :
1. the 12ba4 datasheet notes that pin 4,5 are heater pins and pin 3 is the heater center tap. do i omit pin 3 or do i use pin 4,5 as a floating heater circuit and ground to Power supply ground (center tap on high voltage power supply)?
2. pins 2,7 are both grid pins. do i tie them together or just use one of them
thanks in advance :
If you have 6.3v available, then link pins 4 & 5, and connect one side of your 6.3v to that, and the other to pin 9.
If you have 12.6v available, connect one side to pin 4 and the other to pin 5. Ignore pin 9.
Use either pin 2 or pin 7, or both to connect to the grid. Sometimes it's convenient to connect the grid leak resistor to one pin, and the signal in, to the other.
If you have 12.6v available, connect one side to pin 4 and the other to pin 5. Ignore pin 9.
Use either pin 2 or pin 7, or both to connect to the grid. Sometimes it's convenient to connect the grid leak resistor to one pin, and the signal in, to the other.
If you intend to use 6.3V heater voltage, tie 4 and 5 together and feed 6.3V to 3 and the 4-5 joint.
If you use 12.6V, feed 4 and 5, leave 3 floating.
You can use either of the grid pins or tie them together. If you use grid stopper resistor, tie one resistor to each grid pin.
If you use 12.6V, feed 4 and 5, leave 3 floating.
You can use either of the grid pins or tie them together. If you use grid stopper resistor, tie one resistor to each grid pin.
thanks all,
expect a progress report in a few days, .. touchwood
the tweaking of this thing should be interesting
expect a progress report in a few days, .. touchwood
the tweaking of this thing should be interesting
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