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The original diode sounds good . Im not sure if you already know a easy way to test diodes , but this is how I do it . a analog meter is easier for this .
Touch one lead onto the anode and the other one on the cathode .
depeding on the polarity it will read about 2 k or if it is in the other position it will read anywhere from 40 K to 100k .
for example , you touch the test leads on the diode , it read 2K
you reverse the leads red lead where the black was , if it then reads 40K the diode is allright .
If it was defective it would read for example 2k and when it is reversed 2K .
The other thing that happens is the when it is open it will read 100k or more either polarity .
then there is the shorted diode where either polarity reads 0 ohms or 100 ohms .
the main thing you want to look for is this ohms variance between the polarities , this indicates that the diode is allowing current to pass in only one direction .
Im glad to hear that your Zenith has the same schematics . I got the scanner last week I could send you the alignment info for it once you get it running .
I looked the # of the diode that you bought in my ECG cross referance , I have no listing on it , I am surpised that it was not in there .
A rectifier diode out of a old transistor tabe radio or other small Item should have one that will work .
It seems to be for the bias for some of the tubes " 19 volts 12k ,22k 26volts"
note on the resistor next to C17 , just ahead of the diode . it dosnt seem to handle any great current
what was the schematic # on bipolar capacitor you changed ?
Then I will know where it is in the circuit .
Tubejunke , Is this like your chassis layout?
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