[Collins] Troubleshooting a R388

[Wally Klinger]

Hi All:
 
I have a R-388 on the bench that hears nothing.  I have hiss in the speaker and thats about it.
 
I checked and replaced some tubes that came up as weak on my TV7.
 
I checked the voltages and resistances on the tube sockets.  The one thing that I found to be odd is that there is no grid voltage on the 1st mixer tube pin7 6BE6.  It should be -1.5 to -4.5 volts.  The resistance on that pin is about 316K ohms, about 10K ohms light.
 
The resistor checked okay, but I went ahead and tapped another resistor to ground to see if the tube will turn on, no good.
 
I also noted that the plate voltage on V103 is zero, should be 210 volts.
 
I also saw that the grid voltage on V105 is -1 volt and they call for -10 to -30 volts.
 
I am going around the top of the radio with tube extenders and documenting the pin voltages further down the line.
 
I also injected 455 KC into the grid of the 1st IF and I heard it in the speaker......  Not screaming loud, but I heard it.
 
Any ideas on where I should be looking/what to examine next?
 
73--Wally W9BEA