Thanks everyone for the information, unfortunaly no has the type vibrator I need for this radio, and the one I am using is too tall (can't put on the lid). I will have to figure out what is wrong with this radio so it can use the solid state replacment. Does anyone have a better schematic for this radio other than Riders. As the way mine is wired don't agree with the schematic. mine has 3 250pf capacitors in the vibrator circuit that are not shown in the schmatic, also it has a 150 ohm resister between pin 2 of the vibrator to ground, also not in the circuit.

Hi Ralph

You shouldn't need any special vibrator. Almost any 4 pin 6 volt vibrator will work in your radio. Height can be a factor but check around vibrators are available.

Caps like C104 and C105 are 250 pf. They filter out noise caused by fast switching. Caps are in parallel with .5 mf which are more effective at lower frequencies. The resistor may also be to supress vibrator noise?

Rider has a lot on this radio. Very readable here. Click above the schematic on + to enlarge the information.

http://www.nostalgiaair.org/PagesByModel/959/M0013959.pdf

Norm

:Thanks everyone for the information, unfortunaly no has the type vibrator I need for this radio, and the one I am using is too tall (can't put on the lid). I will have to figure out what is wrong with this radio so it can use the solid state replacment. Does anyone have a better schematic for this radio other than Riders. As the way mine is wired don't agree with the schematic. mine has 3 250pf capacitors in the vibrator circuit that are not shown in the schmatic, also it has a 150 ohm resister between pin 2 of the vibrator to ground, also not in the circuit.
:

: Norm,I have 3, 250 pf mica capacitors in my radio not in that schmatic,all 3 are grounded, one goes to pin # 7 of 7y4, B+, the other 2 go to pins 3 and I would guess that the other one was on pin #2 of the vibrator.( someone had clipped it off short at one end years ago) also on pin #2 of the vibrator I have that 150 ohm resister. Should I just clean all of this stuff out and make it look just like the schmatic? Also I removed all of the wires and measured the input terminals to the transformer no shorts to ground and I get .2 Ohms between all terminals.Hi Ralph
:
: You shouldn't need any special vibrator. Almost any 4 pin 6 volt vibrator will work in your radio. Height can be a factor but check around vibrators are available.
:
: Caps like C104 and C105 are 250 pf. They filter out noise caused by fast switching. Caps are in parallel with .5 mf which are more effective at lower frequencies. The resistor may also be to supress vibrator noise?
:
: Rider has a lot on this radio. Very readable here. Click above the schematic on + to enlarge the information.
:
:http://www.nostalgiaair.org/PagesByModel/959/M0013959.pdf
:
:Norm
:
:
::Thanks everyone for the information, unfortunaly no has the type vibrator I need for this radio, and the one I am using is too tall (can't put on the lid). I will have to figure out what is wrong with this radio so it can use the solid state replacment. Does anyone have a better schematic for this radio other than Riders. As the way mine is wired don't agree with the schematic. mine has 3 250pf capacitors in the vibrator circuit that are not shown in the schmatic, also it has a 150 ohm resister between pin 2 of the vibrator to ground, also not in the circuit.
::
:

Hi Ralph

Those added components are for filtering. It's hard to keep vibrator noise out of a radio. 250 pf caps will have no effect on radio operation except to help filter vibrator hash.

Believe the 150 ohm resistor being in the vibrator circuit is there for the same reason.

Vibrator transformer primary winding has very low resistance.

Does the vibrator buzz with radio on? Any AC voltage on plates of the rectifier tube?

Norm

:: Norm,I have 3, 250 pf mica capacitors in my radio not in that schmatic,all 3 are grounded, one goes to pin # 7 of 7y4, B+, the other 2 go to pins 3 and I would guess that the other one was on pin #2 of the vibrator.( someone had clipped it off short at one end years ago) also on pin #2 of the vibrator I have that 150 ohm resister. Should I just clean all of this stuff out and make it look just like the schmatic? Also I removed all of the wires and measured the input terminals to the transformer no shorts to ground and I get .2 Ohms between all terminals.Hi Ralph
::
:: You shouldn't need any special vibrator. Almost any 4 pin 6 volt vibrator will work in your radio. Height can be a factor but check around vibrators are available.
::
:: Caps like C104 and C105 are 250 pf. They filter out noise caused by fast switching. Caps are in parallel with .5 mf which are more effective at lower frequencies. The resistor may also be to supress vibrator noise?
::
:: Rider has a lot on this radio. Very readable here. Click above the schematic on + to enlarge the information.
::
::http://www.nostalgiaair.org/PagesByModel/959/M0013959.pdf
::
::Norm
::
::
:::Thanks everyone for the information, unfortunaly no has the type vibrator I need for this radio, and the one I am using is too tall (can't put on the lid). I will have to figure out what is wrong with this radio so it can use the solid state replacment. Does anyone have a better schematic for this radio other than Riders. As the way mine is wired don't agree with the schematic. mine has 3 250pf capacitors in the vibrator circuit that are not shown in the schmatic, also it has a 150 ohm resister between pin 2 of the vibrator to ground, also not in the circuit.
:::
::
:

: Norm, I have removed and tested and then reinstalled those components with no effect, I do have some buzzing in the vibrator but probably due to old age the b+ going out of the rectifer tube has about 2.3 volt ac on it. if I increase the filter cap by 22 uf it goes down to 1.2v. the radio sounds great either way, I guess I will just have to hunt around for a vibrator. I have used those solid state vibrators from Antique Automoble Supply for several years and this is the first problem I have ever had!Hi Ralph
:
: Those added components are for filtering. It's hard to keep vibrator noise out of a radio. 250 pf caps will have no effect on radio operation except to help filter vibrator hash.
:
: Believe the 150 ohm resistor being in the vibrator circuit is there for the same reason.
:
: Vibrator transformer primary winding has very low resistance.
:
: Does the vibrator buzz with radio on? Any AC voltage on plates of the rectifier tube?
:
:Norm
:
:
::: Norm,I have 3, 250 pf mica capacitors in my radio not in that schmatic,all 3 are grounded, one goes to pin # 7 of 7y4, B+, the other 2 go to pins 3 and I would guess that the other one was on pin #2 of the vibrator.( someone had clipped it off short at one end years ago) also on pin #2 of the vibrator I have that 150 ohm resister. Should I just clean all of this stuff out and make it look just like the schmatic? Also I removed all of the wires and measured the input terminals to the transformer no shorts to ground and I get .2 Ohms between all terminals.Hi Ralph
:::
::: You shouldn't need any special vibrator. Almost any 4 pin 6 volt vibrator will work in your radio. Height can be a factor but check around vibrators are available.
:::
::: Caps like C104 and C105 are 250 pf. They filter out noise caused by fast switching. Caps are in parallel with .5 mf which are more effective at lower frequencies. The resistor may also be to supress vibrator noise?
:::
::: Rider has a lot on this radio. Very readable here. Click above the schematic on + to enlarge the information.
:::
:::http://www.nostalgiaair.org/PagesByModel/959/M0013959.pdf
:::
:::Norm
:::
:::
::::Thanks everyone for the information, unfortunaly no has the type vibrator I need for this radio, and the one I am using is too tall (can't put on the lid). I will have to figure out what is wrong with this radio so it can use the solid state replacment. Does anyone have a better schematic for this radio other than Riders. As the way mine is wired don't agree with the schematic. mine has 3 250pf capacitors in the vibrator circuit that are not shown in the schmatic, also it has a 150 ohm resister between pin 2 of the vibrator to ground, also not in the circuit.
::::
:::
::
: