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Jolly 7 · 1st Jan 2019, 2:13 pm

There is something not quite right with the audio preamp and output stages of the HX 108-2. My first one has stopped working. It will only give scratchy sounds and no tone when the middle of the volume pot is connected to the AF out of my signal generator. I changed all output transistors, but no luck so far.

I could verify that the RF section is working by bringing it close to a second radio, where from I could hear a beat frequency. Maybe one of the output transformers are internally shorting or something ?

1st Jan 2019, 2:13 pm	#87
Jolly 7 Octode Join Date: Feb 2018 Location: Southampton, Hampshire, UK. Posts: 1,061	Re: More Chinese AM radio kits There is something not quite right with the audio preamp and output stages of the HX 108-2. My first one has stopped working. It will only give scratchy sounds and no tone when the middle of the volume pot is connected to the AF out of my signal generator. I changed all output transistors, but no luck so far. I could verify that the RF section is working by bringing it close to a second radio, where from I could hear a beat frequency. Maybe one of the output transformers are internally shorting or something ?