Hello All,
I can turn on the transistor with a 1.5 volt battery. So I know the transistor and the rest of the radio work great. But without that battery there is no base drive coming from pin 7 of N3 to go through the tuning coil to the base of Q1. The transistor stays off and the radio is silent. All electrolytic capacitors have been replaced. Either part of N1 isn't working or some other component is at fault.
Please help if you know the answer. If I figure it out, I'll let you know. If it's the module, can I add a couple of resistors to supply that base drive?

Thanks,

Dave

:Hello All,
: I can turn on the transistor with a 1.5 volt battery. So I know the transistor and the rest of the radio work great. But without that battery there is no base drive coming from pin 7 of N3 to go through the tuning coil to the base of Q1. The transistor stays off and the radio is silent. All electrolytic capacitors have been replaced. Either part of N1 isn't working or some other component is at fault.
: Please help if you know the answer. If I figure it out, I'll let you know. If it's the module, can I add a couple of resistors to supply that base drive?
:
:Thanks,
:
:Dave

Dave:
I perfer to have the thing working right without adding any components. It satisfied someone at one time, patching up a problem only leads to more complicated problems later, and the poor buzzard down the road that has to figger out what you did to make it work calling you some really bad names.
Lewis
:

Lewis,
I agree but I haven't done anything. I would like to know the circuit diagram for inside the Network, mentioned in the thread below.

Thanks,

Dave
::Hello All,
:: I can turn on the transistor with a 1.5 volt battery. So I know the transistor and the rest of the radio work great. But without that battery there is no base drive coming from pin 7 of N3 to go through the tuning coil to the base of Q1. The transistor stays off and the radio is silent. All electrolytic capacitors have been replaced. Either part of N1 isn't working or some other component is at fault.
:: Please help if you know the answer. If I figure it out, I'll let you know. If it's the module, can I add a couple of resistors to supply that base drive?
::
::Thanks,
::
::Dave
:
:
:Dave:
:I perfer to have the thing working right without adding any components. It satisfied someone at one time, patching up a problem only leads to more complicated problems later, and the poor buzzard down the road that has to figger out what you did to make it work calling you some really bad names.
:Lewis
::
:
:

Hello again all,
The Network has these numbers on it: "3L5-1001-07". It also has P/F in a circle on it for Philco/Ford. If I knew what was inside this network, it would help a lot.

Thanks,

Dave
:Hello All,
: I can turn on the transistor with a 1.5 volt battery. So I know the transistor and the rest of the radio work great. But without that battery there is no base drive coming from pin 7 of N3 to go through the tuning coil to the base of Q1. The transistor stays off and the radio is silent. All electrolytic capacitors have been replaced. Either part of N1 isn't working or some other component is at fault.
: Please help if you know the answer. If I figure it out, I'll let you know. If it's the module, can I add a couple of resistors to supply that base drive?
:
:Thanks,
:
:Dave
:

Dave,

There is a listing for that part here for 5 bucks:

http://elliottscarradio.com/store/index.php?search%5Bkeywords%5D=3L5-1001-07&_a=category

Clifton

:Hello again all,
: The Network has these numbers on it: "3L5-1001-07". It also has P/F in a circle on it for Philco/Ford. If I knew what was inside this network, it would help a lot.
:
:Thanks,
:
:Dave
::Hello All,
:: I can turn on the transistor with a 1.5 volt battery. So I know the transistor and the rest of the radio work great. But without that battery there is no base drive coming from pin 7 of N3 to go through the tuning coil to the base of Q1. The transistor stays off and the radio is silent. All electrolytic capacitors have been replaced. Either part of N1 isn't working or some other component is at fault.
:: Please help if you know the answer. If I figure it out, I'll let you know. If it's the module, can I add a couple of resistors to supply that base drive?
::
::Thanks,
::
::Dave
::
:
:

I wouldn't think that you could "add a couple of resistors" and, in so doing, bypass the module without changing the operation of the radio. Presumably the module is doing more than just providing a fixed bias voltage- it is actively modulating the conductivity of the transistor somehow.

Perhaps if the transistor is just being used in an AGC control circuit you could get away with applying a fixed-current bias to its base, or -better yet- just remove the transistor and replace it with an equivalent resistor from the collector to emitter nodes. But that would surely affect the operation of the set.

The schematic is in Sams AR-126; which is one of the ones I do not have. Maybe someone will be kind enough to provide a scan?

Richard

Richard,
Yes, someone did and I solved the problem. There was an open resistor in N1.

Dave
:The schematic is in Sams AR-126; which is one of the ones I do not have. Maybe someone will be kind enough to provide a scan?
:
:Richard
: