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Model 84 late buzz( 1935 run)
#1

Good Morning Everyone.
Yet another brain teaser at hand. 
This one is a 1935 version of the 84 closest I can figure from the cabinet it definitely has the changes that can be noted from the service bulletins. My dilemma is that area in the pictures regarding the second detector tube. Looking at it closely you can see where the pins should be connected together one end is lifted if I connect it it buzzes as if you were putting your finger on the grid cap of the tube. If I connect those pins that should be as are my other 84's connected together to ground it immediately buzzes. I have already changed all the capacitors in the blocks and the additional 10MFD filter caps and the resistors that were not within 20% of their stated values. I have checked voltages to both the second detector and the audio tube have check grid bias voltages everything is well within reason. Having it on the veriac The buzz remains the same regardless of the voltage setting. The picture of the resistor laying on the brown paper was attached to those two pins and ground prior to my starting on this repair. I have already substituted several different 77s and 42s. Time for some advice
Thanks to All!


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Finally after 50 plus years I'm back into the hobby again. It's like trying to relearn a second language some of it makes sense and some of it doesn't! Could be fun now considering my son is now into old radios and tube technology!
#2

Bruce

No, I cannot see where the pins should be connected: your first pic is centered on one spot and the other is centered on he different spot.

You could possibly use some red arrows to point to what you mean.

People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
#3

Morzh
In the 1st picture where the red wire on upper left is ,is a silver wire under it normally connected to pin 5 ( heater pin ).5,4,3 usually connect to ground. Ill redo the picture. The second is a general view of the rest that resembles my other chassis's on other radios,just incase visually looking an notice something questionable.
Bruce

Finally after 50 plus years I'm back into the hobby again. It's like trying to relearn a second language some of it makes sense and some of it doesn't! Could be fun now considering my son is now into old radios and tube technology!
#4

In the sch 5 is not GND-ed. In you picture they look connected together.
If the tube is 77 - pin 5 is NOT a heater pin. 1 and 6 are. Pin 3 should be at about 100V. 5 an d 4 are GND-ed.

People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.




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Model 84 late buzz( 1935 run)
In the sch 5 is not GND-ed. In you picture they look connected together. If the tube is 77 - pin 5 is NOT a heater pin. ...morzh — 09:05 AM
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