Teaberry Model T 40 Channel CB Base Station

[Dmans]

I would be tempted to short across the "S-Meter" terminals of the switch temporarily to see if that improved the reading. There is only a very tiny current through the switch and any small disruption could create your problem. The meter is a 500uA meter and it should be capable of measuring a voltage as low as 2 microvolts.

73
David

 

[danmcclain]

I would be tempted to short across the "S-Meter" terminals of the switch temporarily to see if that improved the reading. There is only a very tiny current through the switch and any small disruption could create your problem. The meter is a 500uA meter and it should be capable of measuring a voltage as low as 2 microvolts.

73
David

The is a fried ceramic cap near the D1 diode that I need to change when the parts come in, I wonder if that would affect the meter? Dan

 

[Dmans]

I wonder if that would affect the meter?

If it is in the meter circuit, I am sure it could.

73
David

 

[danmcclain]

If it is in the meter circuit, I am sure it could.

73
David

Then I'll wait and check the meter after I change the cap, thanks for the help David.

 

[johnnytek]

I've been working on this cb radio for awhile now. Replaced all the electrolytic capacitors, all the tubes are good. The problem I'm having is when I turn it on, and once it heats up, the signal meter slowly moves down to zero and stays there. I've been told it could be a resistor problem. My next move is to replace all the red resistors (flameproof). Is there any other area that I should check? The receive is fine, by the way.

Thanks, Dan

sounds like a signal rectifier also..

 

[danmcclain]

sounds like a signal rectifier also..

How would I go about testing a signal rectifier? New at this... Thanks, Dan

 

[johnnytek]

How would I go about testing a signal rectifier? New at this... Thanks, Dan

go get a decent fluke meter.. use the diode checker to check diodes and transistors.

 

[danmcclain]

go get a decent fluke meter.. use the diode checker to check diodes and transistors.

I do have a decent fluke meter, thanks for the info... Dan

 

[Dmans]

Dan,
You will need to un-solder one leg of the diodes to test them.

73
David

 

[narfedwards]

Dan,
You will need to un-solder one leg of the diodes to test them.

73
David

check any resistor over 100K one right there by the meter

 

[danmcclain]

Dan,
You will need to un-solder one leg of the diodes to test them.

73
David

Will do that....thanks... Dan

 

[Catalyst 122]

My model t 40 channel just developed an issue, where when I key the mic all power falls out. So I key it and get 3 watts then in a matter of a second its dropped to .6 watts. Is this a tube issue?

 

[danmcclain]

My model t 40 channel just developed an issue, where when I key the mic all power falls out. So I key it and get 3 watts then in a matter of a second its dropped to .6 watts. Is this a tube issue?

Has the radio been recapped? Could be a bad capacitor... Dan

 

[Catalyst 122]

Has the radio been recapped? Could be a bad capacitor... Dan

It has not. I am going to get into it this weekend. Any advice?