It reads right 20 ohms per side but sounds odd. If someone has another let me know. 5 Wires coming out if it.
drone_chord0@hotmail.com
THANX
One side is supposed to be 20 ohms and the other 20 also plus a 47K Resistor and there is a capacitor network also inside the dotted lines on the schematic. They must be built into the upper ceramic part as they are no where in sight. The guy I was working with thought that the fact that I completely unwound the coil and then wound it back up by hand may still have the DC resistance but the AC Characteristics may not be right? He put the signal on both sides and even across it. Nothing when we sweeped with the generator..
:Normally the IF won't cause gnarly sound. Check the loop antenna return line. green wire from loop 2 ohms plus the antenna coil 35 ohms = 37 ohms to ground.
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We replaced the 7C6 tube with a new one. Still nothing. Thanx alot for your helping me I really appreciate it. This is the most frustrating problem I have ever had from any radio. I will now do what you just said about the reading. Because what you said IS exactly. what we did. I admit I was wondering the same thing because the left side was the side that was open not the right and that should work with a modulated RF signal on it shouldn't it..
I said I would post the voltages also here goes.
PINS 1 2 3 4 5 6 7 8
7C7 -(18VAC)(181)(125)(-.07)(0) (-.7)(.8)(17VAC)
7A8 -(17VAC)(182)(126)(-7.8)(57)(-.7)(2.3)(13VAC)
7B7 -(23.8) (174)(52) (0V) (0)(-.7)(-.03)(22VAC)
7C6 -(98VDC)(73.6)(-.7)(0V)(-.7)(-.6) (0V)(13.3VAC)
35L6-(0) (55VAC)(158)(112)(0)(173)(23.5VAC)(7)
50Y6-(173)(55VAC)(0)(100)(100)(111)(109VAC)(200)
:If I understand what you are saying, by putting a modulated RF signal to the 2nd IF secondary this goes right to pin 6 of the 7C6 detector diode. This would be bypassing the IF completely. If you got nothing from the speaker That diode section of the tube is doing nothing. (bad tube) The other possibility is a short to ground. Read green wire of 2nd IF to chassis ground. If you get a low reading, lift the black wire from the IF to chassis ground. Read the green wire again.
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:Despite the signal to the diode section, the AVC voltage does seem to indicate a non-working radio. Replace C-21 100 pf. And C-12 .05
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We put a modulated 455 signal on all parts of the 2nd IF coil which was the original coil that was open,(it was the left side of the coil on the schem,, that was open that goes to Pin 2 of 7b7) between the 7b7 and the 7c6 and even across it we did a sweep, so if we were not getting anything there then earlier stages are not likely where to look I would think. If we would have gotten a signal there then we would have worked our way back to earlier stages.
:Normally the IF won't cause gnarly sound. Check the loop antenna return line. green wire from loop 2 ohms plus the antenna coil 35 ohms = 37 ohms to ground.
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