08-19-2015, 11:13 AM
Ok something is not right on your voltages for the 6v6s pins 4 both are the same point. Why the two different readings?
On the 7x7 the 123mv should not be a problem that is the agc diode and will vary with the signal level. It controls the gain of the previous IF stages.
Check the cap going to the volume control. And check the resistor feeding the plate voltage (the 220k). If the value is correct there should be .6 MA flowing thru the tube. This is from the 291v on one side of it and the 158v on the plate of the 7x7. It should not be red.
Look and see if you can find anything about what kind of voltmeter was used to take the readings in the chart. Ohms/volt? When measuring grid voltages it makes a difference. (their real high impedance)
What kind of voltmeter are you using?
I found at Nostalgia Air the info for this radio and on page 15-39 there is a chart for the voltages taken with different meters. The grid readings taken with the VTVM are like what you are getting. I would use these.
On the 7x7 the 123mv should not be a problem that is the agc diode and will vary with the signal level. It controls the gain of the previous IF stages.
Check the cap going to the volume control. And check the resistor feeding the plate voltage (the 220k). If the value is correct there should be .6 MA flowing thru the tube. This is from the 291v on one side of it and the 158v on the plate of the 7x7. It should not be red.
Look and see if you can find anything about what kind of voltmeter was used to take the readings in the chart. Ohms/volt? When measuring grid voltages it makes a difference. (their real high impedance)
What kind of voltmeter are you using?
I found at Nostalgia Air the info for this radio and on page 15-39 there is a chart for the voltages taken with different meters. The grid readings taken with the VTVM are like what you are getting. I would use these.
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[Image: http://philcoradio.com/phorum/images/smi...on_eek.gif] Chris
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