03-20-2019, 08:41 AM
Arran
My Hippo, I think 48-460 and uses a PM speaker. This uses 30uF for the first cap and 20uF for the second with 220 ohms in between.
This one uses 2x20uF but then it uses the Field coil which is 560 Ohms plus inductance.
I think the reason is this radio uses the cheap speaker without the humbucker. The noise heard might be due to this and there is nothing much one could do.
However one might try to fashion a humbucker coil around the Field coil and connect it in series with the voice coil.
But first we need to do the PM speaker test to establish for a fact that this is the case.
My Hippo, I think 48-460 and uses a PM speaker. This uses 30uF for the first cap and 20uF for the second with 220 ohms in between.
This one uses 2x20uF but then it uses the Field coil which is 560 Ohms plus inductance.
I think the reason is this radio uses the cheap speaker without the humbucker. The noise heard might be due to this and there is nothing much one could do.
However one might try to fashion a humbucker coil around the Field coil and connect it in series with the voice coil.
But first we need to do the PM speaker test to establish for a fact that this is the case.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
