Hello All,
This is an odd problem. Maybe I have faulty detector tubes but every new one I try, it will work. The volume is good. Then if I try to adjust the volume control, it quits playing and I can't get the tuner to have any sound anymore but the pre-amp still works.
This is going to be another frustrating set. But I'm making progress after finally hearing something.

Any ideas?

Thanks,

Dave

Might be the oscillator.

Doug,
What tube does the oscillating? I'll check. But this is too much. I'm going to have to sleep. I guess if I can spend this much time with a radio, I must like it.

OK, I'll check the oscillator. I'll use a transistor radio to see if it picks up the R7A tuning. That I can do quickly.

Thanks,

Dave
:Might be the oscillator.
:

Doug,
The transistor radio says that the oscillator is oscillating and when I tune the R-7A, I can hear something on the transistor radio. So the oscillator is working. There seems to be no output from the tuner getting to the 27. Something is not right. No hum when I touch the input pin on the 27 (Detector). But microphonic is heard fine through the speaker when the detector tube is tapped. When I move the 27 detector tube around in the socket it makes all kinds of noises, the clicks really make the speaker cone move a lot, but I can't see anything loose in the wires leading to the tube socket. Sometimes it will motorboat all by itself and then when I try to see what's causing the motorboating it stops. Faint crackling noises can be heard through the speaker too. I'll eventually find the problem. I put it away 35 years ago because I didn't understand radios. But I'm pretty good at it now. This shouldn't be stumping me, but it is. I would like to get this radio working. It would look good in my living room. I really don't want to take another 35 years to get it working. This is extremely frustrating.

Thanks,

Dave
:Might be the oscillator.
:

Hello Again All,
I'm about to give up on this radio. Now it refuses to work at all. I hear a faint hum when I touch the top pin on the top of the 24A that connects to the antenna coil. I can hear microphonic sounds when I tap the detector tube. If I try connecting a clip lead to the audio input pin on any 27 I put in there I hear nothing. I can not make the hum if I touch it. So something isn't right. But what? It worked for a couple of seconds a couple of times.The sound was great. I was able to tune stations. But each time I turned the the volume control one way or the other, it quit and now it quit permanently and "refuses" to work. I give up. Working 12 hours straight on a radio and getting nowhere is too much.
If you can help, I'll check something, otherwise I think it's going to be put aside for another 35 years I have had it. This is too frustrating. A clear wiring diagram is what I probably need. Maybe with that I can find something wrong. It shouldn't be this difficult.

Thanks,

Dave
:Hello All,
: This is an odd problem. Maybe I have faulty detector tubes but every new one I try, it will work. The volume is good. Then if I try to adjust the volume control, it quits playing and I can't get the tuner to have any sound anymore but the pre-amp still works.
: This is going to be another frustrating set. But I'm making progress after finally hearing something.
:
:Any ideas?
:
:Thanks,
:
:Dave
:

The problem is over thinking about the radio. Put it away for now, sleep on it. A fresh new start for another day. It will probably be something simple overlooked.

:The problem is over thinking about the radio. Put it away for now, sleep on it. A fresh new start for another day. It will probably be something simple overlooked.
:

It could be a cold solder joint, or something of that nature. If there are soldered connections to the chassis, I would reheat them with a big iron, then do some general poking about. I would also make sure all tube pins are making good contact.
I had a mid 50's radio that sprang to life when I happened to push on the top of the speaker frame. Was I fixing to slam it against the wall? One of the IF cans wasn't grounding, but flexing the chassis a bit made it work.

::The problem is over thinking about the radio. Put it away for now, sleep on it. A fresh new start for another day. It will probably be something simple overlooked.
::
:
:It could be a cold solder joint, or something of that nature. If there are soldered connections to the chassis, I would reheat them with a big iron, then do some general poking about. I would also make sure all tube pins are making good contact.
Another one to try is to bypass the volume pot with a jumper or a variable resistor on a jumper.
:I had a mid 50's radio that sprang to life when I happened to push on the top of the speaker frame. Was I fixing to slam it against the wall? One of the IF cans wasn't grounding, but flexing the chassis a bit made it work.
:
:

Hello All,
Yes, I also spent way too much time on it. I ended up having a migraine attack today. But It's over, so I might revisit the R-7A a little later.

Thanks for all your help.

Dave
:::The problem is over thinking about the radio. Put it away for now, sleep on it. A fresh new start for another day. It will probably be something simple overlooked.
:::
::
::It could be a cold solder joint, or something of that nature. If there are soldered connections to the chassis, I would reheat them with a big iron, then do some general poking about. I would also make sure all tube pins are making good contact.
:Another one to try is to bypass the volume pot with a jumper or a variable resistor on a jumper.
::I had a mid 50's radio that sprang to life when I happened to push on the top of the speaker frame. Was I fixing to slam it against the wall? One of the IF cans wasn't grounding, but flexing the chassis a bit made it work.
::
::
:
: