11-05-2023, 09:41 AM
Hello Dale.
What I mean (sorry for my horrible English) is that somebody has tryed to use the 7050 for something else and almost all inside has gone.
I have read the instructions to "calibrate" the line and I have rebuild the 6X5GT circuit with one diode and the resistors involved on it. I put one amp meter in parallel with the 220ohm resistor (R107 in the schematic) and connect my varistor regulated at 115Vac (50Hz here). I have 30Vac at the anode and 394 micro amperes. What I'm trying to calculate is the range of the milliamperimeter that uses the the 7050. As the needle must on the center with the meter I think that I need a 1mA amp meter, but will be great that somebody could measure that on a working unit. I have read here that the resistance of that instrument is around 50 ohm, but that don't help me too much.
A greeting!
What I mean (sorry for my horrible English) is that somebody has tryed to use the 7050 for something else and almost all inside has gone.
I have read the instructions to "calibrate" the line and I have rebuild the 6X5GT circuit with one diode and the resistors involved on it. I put one amp meter in parallel with the 220ohm resistor (R107 in the schematic) and connect my varistor regulated at 115Vac (50Hz here). I have 30Vac at the anode and 394 micro amperes. What I'm trying to calculate is the range of the milliamperimeter that uses the the 7050. As the needle must on the center with the meter I think that I need a 1mA amp meter, but will be great that somebody could measure that on a working unit. I have read here that the resistance of that instrument is around 50 ohm, but that don't help me too much.
A greeting!
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
