I am working on this Stromberg Carlson model 832 and am having trouble with the tuning eye tube. The radio has been recapped and any resistors that were out of tolerance were changed out. It works very good, lots of distant stations and very nice tone. The problem is the tuning eye has very little response when tuning in a station, only a few degrees of movement. I have checked the avc voltage and it varies from about -.02 to -2 volts, any suggestions would be greatly appreciated. Thanks
Greg

If I remember correctly there is a resistor in the socket base of the eye tube. Test it to see if it is good.

Hi Greg

Agree about the resistor but you have another problem.

First the resistor is usually 1 meg built in the socket between pins #2 and #4. Need to open the socket to replace this resistor.

Second -2 volts isn't enough to have much eye movement. Either something is loading down the AVC line, like a leaky cap, or signal isn't strong enough. Be sure your radio is aligned. Monitor the AVC line to adjust IF Transformers for max negative voltage. Might need a larger antenna?

To close a 6E5 eye AVC voltage needs to be -8 volts, 6U5 -22 volts. Most radios should get to -10 or -15 volts on a strong station.

Norm

:I am working on this Stromberg Carlson model 832 and am having trouble with the tuning eye tube. The radio has been recapped and any resistors that were out of tolerance were changed out. It works very good, lots of distant stations and very nice tone. The problem is the tuning eye has very little response when tuning in a station, only a few degrees of movement. I have checked the avc voltage and it varies from about -.02 to -2 volts, any suggestions would be greatly appreciated. Thanks
:Greg

Thanks Anon and Norm, I will check the resitor in the socket and check alignment. I works so good that I never even bothered to check the alignment.
Greg

:Hi Greg
:
: Agree about the resistor but you have another problem.
:
: First the resistor is usually 1 meg built in the socket between pins #2 and #4. Need to open the socket to replace this resistor.
:
: Second -2 volts isn't enough to have much eye movement. Either something is loading down the AVC line, like a leaky cap, or signal isn't strong enough. Be sure your radio is aligned. Monitor the AVC line to adjust IF Transformers for max negative voltage. Might need a larger antenna?
:
: To close a 6E5 eye AVC voltage needs to be -8 volts, 6U5 -22 volts. Most radios should get to -10 or -15 volts on a strong station.
:
:Norm
:
::I am working on this Stromberg Carlson model 832 and am having trouble with the tuning eye tube. The radio has been recapped and any resistors that were out of tolerance were changed out. It works very good, lots of distant stations and very nice tone. The problem is the tuning eye has very little response when tuning in a station, only a few degrees of movement. I have checked the avc voltage and it varies from about -.02 to -2 volts, any suggestions would be greatly appreciated. Thanks
::Greg

Hi Norm, I did an alignment with my Fluke on the AVC line and got the voltage up to just a shade under 10 volts. The tuning eye works better, I put a 6E5 in and it works great with these voltages.
The one thing I noticed when doing this is when watching the voltage with the meter the adjustments seem to be very critical. When close to tune the smallest adjustments make a big difference in the AVC voltage.
Greg

:Hi Greg
:
: Agree about the resistor but you have another problem.
:
: First the resistor is usually 1 meg built in the socket between pins #2 and #4. Need to open the socket to replace this resistor.
:
: Second -2 volts isn't enough to have much eye movement. Either something is loading down the AVC line, like a leaky cap, or signal isn't strong enough. Be sure your radio is aligned. Monitor the AVC line to adjust IF Transformers for max negative voltage. Might need a larger antenna?
:
: To close a 6E5 eye AVC voltage needs to be -8 volts, 6U5 -22 volts. Most radios should get to -10 or -15 volts on a strong station.
:
:Norm
:
::I am working on this Stromberg Carlson model 832 and am having trouble with the tuning eye tube. The radio has been recapped and any resistors that were out of tolerance were changed out. It works very good, lots of distant stations and very nice tone. The problem is the tuning eye has very little response when tuning in a station, only a few degrees of movement. I have checked the avc voltage and it varies from about -.02 to -2 volts, any suggestions would be greatly appreciated. Thanks
::Greg