[Marsupial]

Making some readings before changing some capacitors from the amplification section.


Here is what I read on my 7F8

across the heater, I get 6.76VAC

for section 1:
grid : 2.1 mVDC
plate: 142 VDC
cathode: 2.5VDC

from grid to cathode: 2.2V

section 2:
grid: -1 VDC
plate: 109 VDC
cathode: 0 (sometimes fluctuates in the milivolts)

from grid to cathode: 0.5V

If I understand the schematics correctly, the two plate voltages are OK. However, following riders 19-77 "section 4 - trouble shooting" on FM bands, the grid-cathode measurments are off? They state section 2 grid-cathode voltage should be " negative approx 3 volts"
They seems to talk about a bad oscilator...?? I am not sure I follow...



In any case, I changed a few other caps on the amp section. here's what it currently looks like
[Image: http://i146.photobucket.com/albums/r253/...0_9447.jpg]