Hi,
The above radio has very low volume on headphones.
On other 20s sets the volume nearly deafens me.
Changed tubes , new capacitor, increased voltage.
Have not checked 2 meg resistor because I cannot find it.
Any ideas.
Kind regards
Joe

You could try injecting an audio signal at the detector output to see if the audio amp stages are working OK. That will narrow down the source of the problem a bit.

Thanks CV, but I am not able to do that due to lack of equipment and knowledge.Could you advise me as to to what the resistor looks like and it's location. I hope it is not buried under tar.
Kind regards
Joe

That model is supposedly like the Model 10. AK originally named the 4340 "Radiodyne" but had to rename it when they were informed that another company was already selling radios with that name... so AK dropped the "Radiodyne" and renamed the chassis "Model 10" to further distance their product from the original Radiodyne.

Anyway, there appear to be only three fixed resistances in this set, and all three appear to be associated with tube grids, either in series with the grids or hanging off the grid as a "grid leak" resistor. These may take the form of small bakelite or glass cylinders with metal end caps, somewhat like a Buss cartridge fuse. They will probably be snap-fitted into small brackets, but they could also be hardwired in place. You should be able to locate them by tracing each wire from the grids of the three tubes that have them.

Thanks again CV,
I may be expecting too much from this set, as it is my oldest.
Regards
Joe

Hi Joe

AK Model 10 should be as good as Model 20. Model 10 is breadboard version on Model 20 which is in a wood cabinet.

Check that audio interstage transformers aren't open. A secondary winding can be open and still some signal will be heard.

Connect your antenna to the detector tuner. Work back toward the antenna from there.

Norm

:Hi,
:The above radio has very low volume on headphones.
:On other 20s sets the volume nearly deafens me.
:Changed tubes , new capacitor, increased voltage.
:Have not checked 2 meg resistor because I cannot find it.
:Any ideas.
:Kind regards
:Joe
:

Thank you Norm,
It does appear that I have an open transformer.
Do I have any options outside of putting it in a glass case for show.
Regards
Joe

Joe

You can buy new replacements that should fit inside the old housing?

AES, www.tubesandmore.com and others sells replacements. See P-T156 from AES

Norm

:
:Thank you Norm,
:It does appear that I have an open transformer.
:Do I have any options outside of putting it in a glass case for show.
:Regards
:Joe
:
:

Thank you for the information Norm . The repair will just take a little longer, but it's waited 90 years.
Kind regards
Joe