President Madison no output but has modulation

NEONNIGHT34609 · Sep 19, 2018

Hello I am very new to posting but have been reading the threads for sometime now. I just picked up a president Madison with very low output. It doesn't move the watt meter when on a dummy load but I do have modulation. Where is a good place to start? Also this radio has an antenna warning light that doesnt seem to work is that because there is no or very low output. Ty for any and all help

Tallman · Sep 19, 2018

What mode are you in? SSB will have no output unless you are modulating.
AM will give you carrier wave.

NEONNIGHT34609 · Sep 19, 2018

No wattage on meter in am BUT I hear it has modulation on a test radio I have set up on test bench. So low to no wattage on Am or SSB but it does have modulation

Robb · Sep 19, 2018

Well, the most common thing to look for if you hear a signal on another radio, is to test the driver and final transistor for failure.

NEONNIGHT34609 · Sep 19, 2018

Robb said:
Well, the most common thing to look for if you hear a signal on another radio, is to test the driver and final transistor for failure.

ty I will start there. I am new to this but know my way around a solder iron and DVM

StrangeBrew · Sep 20, 2018

If you just got it check to see if it looks like there are any modifications on the board, someone may have put some kind of a swing kit in it.

nomadradio · Sep 20, 2018

The test radio is hearing the output from the driver transistor.

The one that feeds power into the final transistor.

If the final fails completely, the low-level RF from the driver transistor will be heard by a radio in the same room.

But not a lot farther away than that.

This radio feeds modulated audio to both the driver and to the final transistor. If the final fails completely, the RF from the driver will still have modulation.

73

NEONNIGHT34609 · Sep 24, 2018

nomadradio said:
The test radio is hearing the output from the driver transistor.

The one that feeds power into the final transistor.

If the final fails completely, the low-level RF from the driver transistor will be heard by a radio in the same room.

But not a lot farther away than that.

This radio feeds modulated audio to both the driver and to the final transistor. If the final fails completely, the RF from the driver will still have modulation.

73

That makes alot of sense I am gonna order new finals TY

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President Madison no output but has modulation

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