Hello All,
I'm working on a Ford model TOB6TBS from 1965. I suspect a faulty disc capacitor or network, but without the schematic, I'm not sure where to look. This set has a bunch of networks in it.

Thanks,

Dave

Disc capacitors rarely fail. I would look for any electrolytic bypass caps and or audio coupling caps that have gotten leaky.

Lou

:Hello All,
: I'm working on a Ford model TOB6TBS from 1965. I suspect a faulty disc capacitor or network, but without the schematic, I'm not sure where to look. This set has a bunch of networks in it.
:
:Thanks,
:
:Dave

Lou,
That's true, only there are very few if any electrolytic capacitors that I can see in there. I just see three. If ther are more, I'll need the service data to find them.

Thanks,

Dave
:Disc capacitors rarely fail. I would look for any electrolytic bypass caps and or audio coupling caps that have gotten leaky.
:
:Lou
:
::Hello All,
:: I'm working on a Ford model TOB6TBS from 1965. I suspect a faulty disc capacitor or network, but without the schematic, I'm not sure where to look. This set has a bunch of networks in it.
::
::Thanks,
::
::Dave

Dave,
It's a 66 T-Bird AM-FM radio, covered in Sams AR-39.

The AM-FM switch is a trouble spot in this radio, another bright idea from the folks at Bendix. You're right, there are only three electrolytics, the two in the filter can and the small 50mfd. on the other end of the circuit board. The 50mfd. looks like it is in the AVC circuit. I always suspect these small electrolytic caps first.

I have your address, so I'll get the manual in the mail tomorrow, unless someone can send it in an email.
Meade

:Lou,
: That's true, only there are very few if any electrolytic capacitors that I can see in there. I just see three. If ther are more, I'll need the service data to find them.
:
:Thanks,
:
:Dave
::Disc capacitors rarely fail. I would look for any electrolytic bypass caps and or audio coupling caps that have gotten leaky.
::
::Lou
::
:::Hello All,
::: I'm working on a Ford model TOB6TBS from 1965. I suspect a faulty disc capacitor or network, but without the schematic, I'm not sure where to look. This set has a bunch of networks in it.
:::
:::Thanks,
:::
:::Dave

Mag,
Thanks very much. I have a bunch of service data and if I have one that you need I will be happy to send you one. I have a pile of them but they're not in order. One day I'll sort them all out and make a list of what I have.

Thanks again,

:Dave,
:It's a 66 T-Bird AM-FM radio, covered in Sams AR-39.
:
:The AM-FM switch is a trouble spot in this radio, another bright idea from the folks at Bendix. You're right, there are only three electrolytics, the two in the filter can and the small 50mfd. on the other end of the circuit board. The 50mfd. looks like it is in the AVC circuit. I always suspect these small electrolytic caps first.
:
:I have your address, so I'll get the manual in the mail tomorrow, unless someone can send it in an email.
:Meade
:
:
:
:
::Lou,
:: That's true, only there are very few if any electrolytic capacitors that I can see in there. I just see three. If ther are more, I'll need the service data to find them.
::
::Thanks,
::
::Dave
:::Disc capacitors rarely fail. I would look for any electrolytic bypass caps and or audio coupling caps that have gotten leaky.
:::
:::Lou
:::
::::Hello All,
:::: I'm working on a Ford model TOB6TBS from 1965. I suspect a faulty disc capacitor or network, but without the schematic, I'm not sure where to look. This set has a bunch of networks in it.
::::
::::Thanks,
::::
::::Dave

Mag,
I'm pretty sure I have it hooked up correctly. The short 2 conductor connector is +. One powers the radio and one powers the dial lamps. On the 4 conductor terminal, I find one is connected to the chassis and one is for the speaker +. The other two may be for a fader control or a rear speaker. Is this correct?

Thanks,

:Dave,
:It's a 66 T-Bird AM-FM radio, covered in Sams AR-39.
:
:The AM-FM switch is a trouble spot in this radio, another bright idea from the folks at Bendix. You're right, there are only three electrolytics, the two in the filter can and the small 50mfd. on the other end of the circuit board. The 50mfd. looks like it is in the AVC circuit. I always suspect these small electrolytic caps first.
:
:I have your address, so I'll get the manual in the mail tomorrow, unless someone can send it in an email.
:Meade
:
:
:
:
::Lou,
:: That's true, only there are very few if any electrolytic capacitors that I can see in there. I just see three. If ther are more, I'll need the service data to find them.
::
::Thanks,
::
::Dave
:::Disc capacitors rarely fail. I would look for any electrolytic bypass caps and or audio coupling caps that have gotten leaky.
:::
:::Lou
:::
::::Hello All,
:::: I'm working on a Ford model TOB6TBS from 1965. I suspect a faulty disc capacitor or network, but without the schematic, I'm not sure where to look. This set has a bunch of networks in it.
::::
::::Thanks,
::::
::::Dave

Yes, there is a 50ohm fader connected to the other two connectors in that plug. For bench testing you can just ignore the fader connections--all the fader/speaker interconnections were made in the car wiring harness. On that 4 conducter plug, the male terminal is ground, next is the + for front speaker(goes directly to the output transformer via a spark plate), next is wiper of the fader, and last is one end of the fader. Other end of the fader goes to ground.

:Mag,
: I'm pretty sure I have it hooked up correctly. The short 2 conductor connector is +. One powers the radio and one powers the dial lamps. On the 4 conductor terminal, I find one is connected to the chassis and one is for the speaker +. The other two may be for a fader control or a rear speaker. Is this correct?
:
:Thanks,
:
::Dave,
::It's a 66 T-Bird AM-FM radio, covered in Sams AR-39.
::
::The AM-FM switch is a trouble spot in this radio, another bright idea from the folks at Bendix. You're right, there are only three electrolytics, the two in the filter can and the small 50mfd. on the other end of the circuit board. The 50mfd. looks like it is in the AVC circuit. I always suspect these small electrolytic caps first.
::
::I have your address, so I'll get the manual in the mail tomorrow, unless someone can send it in an email.
::Meade
::
::
::
::
:::Lou,
::: That's true, only there are very few if any electrolytic capacitors that I can see in there. I just see three. If ther are more, I'll need the service data to find them.
:::
:::Thanks,
:::
:::Dave
::::Disc capacitors rarely fail. I would look for any electrolytic bypass caps and or audio coupling caps that have gotten leaky.
::::
::::Lou
::::
:::::Hello All,
::::: I'm working on a Ford model TOB6TBS from 1965. I suspect a faulty disc capacitor or network, but without the schematic, I'm not sure where to look. This set has a bunch of networks in it.
:::::
:::::Thanks,
:::::
:::::Dave

MAG,
Thanks very much for the service data. From the solder side of the PC board I was able to determine that the emitter resistor was open and one of the output transistors was shorted. I have a bunch of NOS Bendix transistors, so I substituted the Bendix 2N257 for the original and it works fine. No more weak volume. It can blast it's 6 watts again.
The band switch problem didn't turn out to be the band switch at all. I cleaned it and it makes perfect connections. I noticed that when I taped the pc board or put the slightest pressure on it, I would hear AM, loud. When I let up on the pressure, it went down to almost nothing. It was really sensitive near one of the jumper terminals. Tapping the connector made AM turn on and off like crazy. So I unpluged the connector and put it back on the terminal and no more band switch problems. It's blue jumper connected to the AM RF trimmer C29A. So the problem fooled me into thinking that the band switch was at fault.
It was the vibration from flipping the switch that made the blue wire intermittently connect to the terminal. That's all I can tell. It doesn't seem to have the problem. But like all intermittents, it could return.

Thanks again,

Dave
:Yes, there is a 50ohm fader connected to the other two connectors in that plug. For bench testing you can just ignore the fader connections--all the fader/speaker interconnections were made in the car wiring harness. On that 4 conducter plug, the male terminal is ground, next is the + for front speaker(goes directly to the output transformer via a spark plate), next is wiper of the fader, and last is one end of the fader. Other end of the fader goes to ground.
:
::Mag,
:: I'm pretty sure I have it hooked up correctly. The short 2 conductor connector is +. One powers the radio and one powers the dial lamps. On the 4 conductor terminal, I find one is connected to the chassis and one is for the speaker +. The other two may be for a fader control or a rear speaker. Is this correct?
::
::Thanks,
::
:::Dave,
:::It's a 66 T-Bird AM-FM radio, covered in Sams AR-39.
:::
:::The AM-FM switch is a trouble spot in this radio, another bright idea from the folks at Bendix. You're right, there are only three electrolytics, the two in the filter can and the small 50mfd. on the other end of the circuit board. The 50mfd. looks like it is in the AVC circuit. I always suspect these small electrolytic caps first.
:::
:::I have your address, so I'll get the manual in the mail tomorrow, unless someone can send it in an email.
:::Meade
:::
:::
:::
:::
::::Lou,
:::: That's true, only there are very few if any electrolytic capacitors that I can see in there. I just see three. If ther are more, I'll need the service data to find them.
::::
::::Thanks,
::::
::::Dave
:::::Disc capacitors rarely fail. I would look for any electrolytic bypass caps and or audio coupling caps that have gotten leaky.
:::::
:::::Lou
:::::
::::::Hello All,
:::::: I'm working on a Ford model TOB6TBS from 1965. I suspect a faulty disc capacitor or network, but without the schematic, I'm not sure where to look. This set has a bunch of networks in it.
::::::
::::::Thanks,
::::::
::::::Dave