I am working on a zenith model 6d629 chassis #6b01 Rider 13-14 should this chassis be hot? I get 120v on the meter from the chassis to gd and also the 6v bulb sockets read 120, I looked at the sch and the way I read the power coming in it looks like the power for the dial lights are tied into the main feed and this is the way it is wired, it appears that someone worked on this, I recapped the entire radio, the radio seems over powered, I put sig gen on ant and can tune it in around 500kc, no stations any help ? thanks George

:I am working on a zenith model 6d629 chassis #6b01 Rider 13-14 should this chassis be hot? I get 120v on the meter from the chassis to gd and also the 6v bulb sockets read 120, I looked at the sch and the way I read the power coming in it looks like the power for the dial lights are tied into the main feed and this is the way it is wired, it appears that someone worked on this, I recapped the entire radio, the radio seems over powered, I put sig gen on ant and can tune it in around 500kc, no stations any help ? thanks George

George,

The chassis of this radio is isolated from the line and should not be hot. Since you recapped the radio the caps should be ok providing you used new fresh caps. C5 is from B- to the chassis; I like to use caps for this purpose rated at least 1000v. The two 3.2 volt pilot lamps (1490's)are in series and are connected from one side of the line to the pilot lamp tap on the 35Z5. This is effectively between pins 2 and 3 of the 35Z5. May want to check for a short between the lamp socket mounting and the lamp socket. Also may want to check the wiring along the B- bus to make sure there is not a wiring short from it to the chassis. Your oscillator may not be running since you can put a signal in around 500 KHz. Possibly you may have an open oscillator coil. Measure the coil resistance. Two pairs of coil leads should measure continuity, the 5th one is a capacity winding with a resistor coming off it. Good luck.

Radiodoc

Hi

Not unusual for a chassis to read full line voltage when measured to ground. This reading will change when the plug is reversed.

Your radio will have a capacitor (C5, .07 mfd) from one side of the line to chassis. Capacitor act as a resistor on AC voltage.

Modern meters are sensitive and put very little load on circuits so you will read full line voltage. If you put a lamp across this voltage it should load down and not light.

Norm

::I am working on a zenith model 6d629 chassis #6b01 Rider 13-14 should this chassis be hot? I get 120v on the meter from the chassis to gd and also the 6v bulb sockets read 120, I looked at the sch and the way I read the power coming in it looks like the power for the dial lights are tied into the main feed and this is the way it is wired, it appears that someone worked on this, I recapped the entire radio, the radio seems over powered, I put sig gen on ant and can tune it in around 500kc, no stations any help ? thanks George
:
:George,
:
:The chassis of this radio is isolated from the line and should not be hot. Since you recapped the radio the caps should be ok providing you used new fresh caps. C5 is from B- to the chassis; I like to use caps for this purpose rated at least 1000v. The two 3.2 volt pilot lamps (1490's)are in series and are connected from one side of the line to the pilot lamp tap on the 35Z5. This is effectively between pins 2 and 3 of the 35Z5. May want to check for a short between the lamp socket mounting and the lamp socket. Also may want to check the wiring along the B- bus to make sure there is not a wiring short from it to the chassis. Your oscillator may not be running since you can put a signal in around 500 KHz. Possibly you may have an open oscillator coil. Measure the coil resistance. Two pairs of coil leads should measure continuity, the 5th one is a capacity winding with a resistor coming off it. Good luck.
:
:Radiodoc
:

::I am working on a zenith model 6d629 chassis #6b01 Rider 13-14 should this chassis be hot? I get 120v on the meter from the chassis to gd and also the 6v bulb sockets read 120, I looked at the sch and the way I read the power coming in it looks like the power for the dial lights are tied into the main feed and this is the way it is wired, it appears that someone worked on this, I recapped the entire radio, the radio seems over powered, I put sig gen on ant and can tune it in around 500kc, no stations any help ? thanks George
:Thanks Radiodoc I am still trying to figure this out can't seem to find a short, tried to isolate the items you stated also isolated the wave magnet, will keep pluging thanks for your response. George
:George,
:
:The chassis of this radio is isolated from the line and should not be hot. Since you recapped the radio the caps should be ok providing you used new fresh caps. C5 is from B- to the chassis; I like to use caps for this purpose rated at least 1000v. The two 3.2 volt pilot lamps (1490's)are in series and are connected from one side of the line to the pilot lamp tap on the 35Z5. This is effectively between pins 2 and 3 of the 35Z5. May want to check for a short between the lamp socket mounting and the lamp socket. Also may want to check the wiring along the B- bus to make sure there is not a wiring short from it to the chassis. Your oscillator may not be running since you can put a signal in around 500 KHz. Possibly you may have an open oscillator coil. Measure the coil resistance. Two pairs of coil leads should measure continuity, the 5th one is a capacity winding with a resistor coming off it. Good luck.
:
:Radiodoc
:

:::I am working on a zenith model 6d629 chassis #6b01 Rider 13-14 should this chassis be hot? I get 120v on the meter from the chassis to gd and also the 6v bulb sockets read 120, I looked at the sch and the way I read the power coming in it looks like the power for the dial lights are tied into the main feed and this is the way it is wired, it appears that someone worked on this, I recapped the entire radio, the radio seems over powered, I put sig gen on ant and can tune it in around 500kc, no stations any help ? thanks George
::Thanks Radiodoc I am still trying to figure this out can't seem to find a short, tried to isolate the items you stated also isolated the wave magnet, will keep pluging thanks for your response. George
::George,
::
::The chassis of this radio is isolated from the line and should not be hot. Since you recapped the radio the caps should be ok providing you used new fresh caps. C5 is from B- to the chassis; I like to use caps for this purpose rated at least 1000v. The two 3.2 volt pilot lamps (1490's)are in series and are connected from one side of the line to the pilot lamp tap on the 35Z5. This is effectively between pins 2 and 3 of the 35Z5. May want to check for a short between the lamp socket mounting and the lamp socket. Also may want to check the wiring along the B- bus to make sure there is not a wiring short from it to the chassis. Your oscillator may not be running since you can put a signal in around 500 KHz. Possibly you may have an open oscillator coil. Measure the coil resistance. Two pairs of coil leads should measure continuity, the 5th one is a capacity winding with a resistor coming off it. Good luck.
::
::Radiodoc
::

George,

Norm mentioned in an earlier post about new meters may show full line voltage when measuring from ground to the chassis (may want to re-read his post). Connecting a small wattage bulb should reduce the voltage measured. As for an isolation transformer, they are available. However, I have used back to back filament transformers sometimes. They are fairly cheap. Just hook the secondaries together and feed 120 to one and take 120 off the other to power the radio.

Radiodoc

Here is your schematic:

http://www.nostalgiaair.org/PagesByModel/111/M0025111.pdf

Note: There is NO ISOLATION, because there is no power transformer. Since this is an AC/DC radio, the chasis is probably connected to one side of the line. Depending on the polarity of the plug, the chasis could be hot!

It is probably best to buy an isolation transformer to safely operate that set.

:I am working on a zenith model 6d629 chassis #6b01 Rider 13-14 should this chassis be hot? I get 120v on the meter from the chassis to gd and also the 6v bulb sockets read 120, I looked at the sch and the way I read the power coming in it looks like the power for the dial lights are tied into the main feed and this is the way it is wired, it appears that someone worked on this, I recapped the entire radio, the radio seems over powered, I put sig gen on ant and can tune it in around 500kc, no stations any help ? thanks George

:Here is your schematic:
:
:http://www.nostalgiaair.org/PagesByModel/111/M0025111.pdf
:
:Note: There is NO ISOLATION, because there is no power transformer. Since this is an AC/DC radio, the chasis is probably connected to one side of the line. Depending on the polarity of the plug, the chasis could be hot!
:Hi Stephen thanks for getting back to me,I changed the polarity still have a 120v to chassis, how would I size an isolation transformer 120 primary and 6v secondary?Thanks George
:It is probably best to buy an isolation transformer to safely operate that set.
:
:
:
::I am working on a zenith model 6d629 chassis #6b01 Rider 13-14 should this chassis be hot? I get 120v on the meter from the chassis to gd and also the 6v bulb sockets read 120, I looked at the sch and the way I read the power coming in it looks like the power for the dial lights are tied into the main feed and this is the way it is wired, it appears that someone worked on this, I recapped the entire radio, the radio seems over powered, I put sig gen on ant and can tune it in around 500kc, no stations any help ? thanks George